What is the average cost per square foot for an addition of part?

What is the average cost per square foot for an addition of part?

Anticipate your expansion of the house without stress. To have peace of mind at each stage of this major project, let the professionals of the House Soumissions platform accompany you.

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Here are the topics covered in this full guide for your house enlargement:

You like your current home. Your neighborhood is active (or quiet) as desired, your earthworks are completed as you wish, your basement is optimized, your patio is perfect and your shed is suitable for you. You don’t want to move and start all over again, but the family is growing, the teens are running out of space, you would like to have your aging parents near you … in short, you will start to feel cramped.

What is the best solution?

Enlarge towards the backyard or the sides? Dig a basement? Add an entire or partial floor? Add a tower?

Before making your choice, the first step is to make the most realistic budget possible.

To do this, you can use two (2) calculation methods.

Method 1: How much is your home expansion project cost per square foot?

To give a quick approximation of the price of your home extension, a professional who has already accumulated several years of experience and carried out a large quantity of projects such as yours will be able to evaluate all the dimensions and express them in cubic feet, linear feet and square feet of work to be performed.

By simply multiplying each result by the cost of materials at pi, linear or pi, you will get a rough estimate of the price of the materials necessary for your house extension project.

Here is an example :

You want to build an extension on a concrete slab. The free wood you have chosen to make the floor costs $ 10 / pi, including installation. Knowing that the area of the extension is 100 pi, you can calculate that the floor price will be $ 1,000 (100 pi x 10 $ / pi)

Method 2: What would be the lump sum price to enlarge your home?

It is difficult to calculate precisely the standard price for a house enlargement.

This approach requires the competence of an expert capable of determining, according to each trade body involved in your home extension project:

  • all tasks to be accomplished
  • the time required to execute them
  • the price of labor associated with these tasks
  • the materials required
  • the price of the latter

Obviously, taxes must be added to these amounts. On the other hand, under certain conditions, it is possible to have 36% of the maximum TPS and 50% of the maximum TVQ reimbursed. Ask a professional.

Here are some examples of the flat price for adding a floor or extending a house from the sides or back.

  • Adding a floor to a 1,150 pi bungalow (107 m) can cost between $ 175,000 and $ 250,000 depending on the quality of the materials used and the design chosen.
  • Adding a floor to a 1,000 pi (93 m) bungalow to include, for example, a bathroom, four (4) rooms and a staircase can cost between $ 100,000 and $ 150,000 ($ 200,000 in the Greater Montreal region).
  • A house extension to add 150 pi (14m) by the sides or the back would amount to $ 70,000, if you include a basement that still needs to do some work before being completed.

To obtain a realistic price, several factors must also be taken into account such as:

  • the level of difficulty encountered by entrepreneurs in assembling the new section at the existing house,
  • the adjustment or solidification work to be carried out on the existing building,
  • the quality of the materials you have chosen,
  • the number of doors and windows to set up,
  • etc.

Some recommendations to assess the price of a house enlargement

Ask for help from architecture professionals three (3) to four (4) months before the date you plan to start work. You will thus know the feasibility of your project.

Find out about the price of materials in your locality. According to an analysis commissioned by the APCHQ, it is possible that given the variation in the prices of materials in the different regions of Quebec, you had to pay double that in another city, for an enlargement of 1,000 pi for example.

Request price bids at different times of the year. By planning to expand your home in September or October (if it is possible to do your work in two (2) or three (3) months at most), you could be offered more favorable because the entrepreneurs are less busy. Request your submissions by filling out the form on this page, it’s free and fast.

Plan the contingencies by adding a budget provision of around 20% of the amount planned for your home extension.

Also set aside a sum for the storage of certain furniture as well as for going to the hotel, the time to take shelter from heavy work.

Types of house expansion & price

There are different types of house enlargement. How to know which one best suits your needs, requirements and budget?

Price for adding a floor

The value of your house will make a meteoric leap, because not only will it be larger, but all its design will be transformed: addition of pinion, new windows (agging with existing windows), renewal of the exterior coating …

The majority of the costs allocated to adding a floor will be generated by heavy machinery and labor

Each house expansion project is different. Depending on the size of the work, the price of adding a floor can vary between $ 90,000 and $ 150,000 if we talk about adding accommodation (upstairs) to a single-family house. 1,000 pi.

Usually, adding a floor is over when you repossess your home. However, you can save on the cost of labor if you have the know-how and experience to:

  • install the exterior coating,
  • build the staircase leading upstairs
  • build internal divisions,
  • perform the interior finish,
  • etc.

Price for adding a basement

The addition of a basement gives an appreciable gain in multifunctional space to your home: living room, bathroom, bedroom, storage space … without the outside appearance being affected.

In addition, you will be able to easily access your plumbing and heating system.

To add a basement to your home, entrepreneurs specializing in foundations must work in what is called a “subwork”. This means that they have to dig under the basement to sink a new concrete foundation precisely under the existing foundations.

Between $ 25 and $ 50 / pi (including concrete foundations) must be provided for this type of home expansion given the technology required, the machinery used and the know-how of entrepreneurs specializing in the addition of subsoil.

Price for adding a garage

Adding a garage to your house is not only adding a parking area (particularly appreciated in winter), but it is also providing you with additional storage space for bikes, tools, tires, furniture. garden (in winter season), etc.

If you isolate it, heat it, ventilate it and add sockets to it, you can include a workshop with an established for your carpentry and mechanical work or to repair certain odds and ends.

A garage will increase the value of your home by making it look larger.

  • Adding an adjoining garage (attached) to your home will allow you to access it without having to go outside (appreciated in winter)
  • On the other hand, adding a separate garage to the house will give you the opportunity to do work that makes a lot of noise (jumping saw, round saw, mechanics …).

The price of adding a single garage is estimated to be approximately $ 18,000. As for a double garage, you have to plan approximately $ 25,000.

If you need to build a sloping access, plan approximately $ 1,000 to an additional $ 1,500.

The concrete slab represents a cost varying between $ 9 and $ 11 per pi, or about 20% of the construction price of your garage.

The size, style, choice of materials and price of garage doors are very varied. Ask your entrepreneur for advice.

If you plan to build or expand your garage and want to receive free bids, just complete the bid request form on this page.

House submissions will send it to one of its many partners who have gathered on its platform to offer you its services. You will quickly receive up to three (3) bids from recommended professionals in house or garage expansion in your area, without any obligation on your part.

Price for enlargement on foundations

The price of a foundation house extension will fluctuate depending on the type of excavation, the amount of concrete to pour and the integration of the annex into the existing building.

The cost of a house extension on a foundation will also vary depending on the area and depth of the foundation:

  • The radier is a surface foundation (50 cm at 1 m deep) in the form of a reinforced concrete platform which extends over the complete surface of the annex.
  • The shooting sole is a surface foundation cast exclusively under the load-bearing walls.
  • The semi-deep foundation is a sole that dives between 2 and 5 m below the ground.
  • The deep foundation descends to 6 or 7 m deep. However, it can be replaced by piles plunging up to 12 m deep.

Price for the extension on piles

This type of home extension is particularly suitable for floodplains and unstable soils. However, care should be taken to isolate the floor from the appendix very well on piles, especially if you plan to install a heating floor there, as heat loss can occur from below the floor.

Enlarging on pious is generally more economical than a house extension on a foundation, since the necessary machinery and the importance of the work are undoubtedly less considerable.

Indeed, if the price of the concrete foundation for the house extension is approximately $ 300 / pi ($ 400 if a basement is included in the house extension) installing a stake can cost around $ 140, to which must be added the price of the construction of the extension and the insulation which varies around $ 125 to $ 155 / pi.

Price for the extension on concrete slab

A lateral extension of your house on a monolithic concrete slab, that is to say formed of a single block serving both as a floor and as a foundation, is an option to consider if you want to avoid casting new soling .

Insulating this type of house extension is easy.

If your municipality grants you the required permits, a structural engineer gives you its approval and the floor of your property lends itself to your project to extend the house on concrete slabs, the construction of the latter will cost you approximately 165 $ 195 / pi.

The approximate prices of the different types of house enlargement

Addition of a floorat least $ 90,000 for a single-family home of 1,000 pi$ 175 / pi minimum +

$ 10,000 in associated work

Addition of a garageSimple garage: $ 18,000

Double garage: $ 25,000

Sloping access: $ 1,000 to $ 1,500

The concrete slab can cost between $ 9 and $ 11 / pi
Lie on stakesSetting up a stake can cost around $ 140Construction prices of

· The extension and insulation vary around $ 125 to $ 155 / pi,

· The structure and finish (interior and exterior) are approximately $ 200 / pi.

Extend on concrete slabAbout $ 165 to $ 195 / pi

If a basement is included: budget about $ 400 / pi.

To obtain more precise submissions, you just need to contact Soumissions Maison at
1 (855) 280-0106 or to complete the tender request form on this page.

Qualified and experienced entrepreneurs, who have all the required permits and certifications, will be recommended to you.

COVID-19: what impact on the price of your enlargement or addition of floor in 2021?

You plan to expand or add floor in 2021? You have chosen a difficult period for such a construction project, since like many potential manufacturers, you have certainly heard of the meteoric rise in the price of materials!

Here is what you should know about “the COVID-19 effect” and its implications for your expansion project in 2021!

Why COVID-19 has impacted the cost of materials?

An excellent first question! The answers, unfortunately, are nuanced and sometimes contradictory. We agree that the slowdown in the production chain, combined with the increase in demand in the construction sector and the lack of manpower have contributed to making materials rarer, and therefore more expensive. .

The explosion in the price of wood, headaches in sight for your project!

Even if the price of wood is falling in the second half of 2021, it is still more expensive than it was before its skyrocketing. In addition, even if the price of wood goes down, that of entrepreneurs is slow to do the same, and that is why you will be able to anticipate an extra of around 20% for your project.

The shortage of materials is a first major problem for an addition of floor!

Aside from more expensive wood, another problem that awaits your expansion project is the shortage of materials such as lumber, gypsum, insulating wool and other materials essential to the structure. These materials have not disappeared, don’t worry. However, you may meet delivery times en route.

Obviously, beware of entrepreneurs who put everything on the back of COVID-19! The cost of materials has increased, it is indisputable. That said, don’t get caught by astronomical rates that aren’t justified by the increase in materials.

Ask for several submissions and ask questions before signing the contract for your enlargement or addition of floor.

How to reduce the impact of the pandemic on your enlargement project?

Compare several entrepreneurs!

The COVID-19 pandemic has created large price variations for entrepreneurs for several reasons. First, some have faster and easier access to timber while others have stocked up in advance.

By comparing at least 3 construction contractors specializing in adding floors, you make sure you know the right price!

Also explore the option to participate in finishing work!

Finishing is always expensive on a construction site. If you are unable to save on the lumber, assess the option of performing part of the finish such as painting, floor cover and other procedures available to handymen.

Wait a minute, prices have been declining since the second half of 2021!

As mentioned, the price of wood has been going down since May-June 2021. If you see prices still too high, give the time for the price of materials to go back down, but remain on the lookout for a possible increase.

What if your entrepreneur imposes an increase on you at the last minute?

Does an entrepreneur have the right to demand a price increase?

It all depends on the type of contract you signed! As you have signed a fixed price contract, an increase cannot be imposed on you, but there is practically no such contract in residential construction. Thus, an entrepreneur may impose an increase on you if it is justified and if such a clause is provided for in the contract.

Is the contractor entitled to terminate the contract unilaterally?

Not without serious reason! You, on your side and as a consumer, have the right to terminate the contract at all times before the start of the work. However, the construction contractor must invoke a serious reason and even force majeure to put an end to the agreement.

What to do if a disagreement occurs with the entrepreneur? The ACQC (Consumer Association for Quality in Construction) offers advice, resources and recommendations to injured consumers. They will advise you if a problem arises!

Benefits of expanding his home

Enlarging your home by adding a basement, adding a garage, adding a floor, lengthening or extending it to the backyard may be your best decision.

There are several advantages to expanding your home in order to restore it and adapt it to your new reality.

You continue to live in your neighborhood and in the home that you enjoy so much while improving it.

You do not go away from your workplace, your children can continue to attend the same school and everyone keeps their daily routine, while having more space to go about their business.

In fact, this is a personalized increase in your living space, a tailor-made restructuring, a new layout which is the solution to too limited a space.

The expansion of your home :

  • opens the door to a multitude of possibilities and innovations,
  • allows easier movement inside your home
  • maximizes the entry of natural light,
  • optimizes storage spaces,
  • gives the opportunity to improve the energy efficiency of your residence,
  • gives the opportunity to update the design,
  • can give the opportunity to invest in ecological architecture,

By avoiding moving, you avoid having to defray the transfer tax (also called the Welcome tax), the costs incurred by the movers and the moving truck, the cost of the new decoration, the fees of the notary and the inspector pre-purchase, etc.

Not only will you expand your home allow you to adapt it to your image, but it will now meet your needs and requirements.

Larger, more functional, more modern and more current, its value will skyrocket on the real estate market.

Hire an architect for an extension to your property ?

According to the Association of Institutional Real Estate Managers (AGPI), in a “green” environment, productivity would be favored in the range of approximately 6 to 16% and the absence rate reduced by 15%.

If this is the consequence of a coherent, functional and harmonious working environment, what should you think of the advantages that you could derive from a home whose enlargement plans were designed by an architect specialized in house extension ?

Most of the time, the law requires that an architect take part in a project to enlarge a residential, commercial, industrial or institutional building since he has undergone training, has the competence and has acquired the knowledge -do professional necessary to carry out this kind of work.

Being supervised by the Order of Architects of Quebec (OAQ), a certified architect has the obligation to take out professional liability insurance, apply the code of ethics and participate in a continuing education program.

However, even if you were not required by law, it is always strongly recommended to use the service of an architect. This is the professional who has the best skills to support you in your home expansion project.

Winning or losing enlargement ?

An architect will be able to direct you towards a winning enlargement, whether it’s adding a floor (complete or partial) adding a basement (complete or partial) adding a garage or room above it, the extension of your home from the back or sides, the construction of a cantilever (can save you up to four (4) feet).

Unfortunately, there are also losing enlargements; those who distort your home by not respecting its basic architecture. An architect will allow you to avoid this kind of situation.

The architect will be able to enlarge your house while preserving its original style and its general appearance, whether the latter is centenary or modern, Canadian, English, Acadian, contemporary … so that its value is increased on the real estate market. .

A professional architect will precisely define your current needs and will also plan for those to come, taking into account the limits of your budget, before designing his plans to extend your home

It will also ensure that the soil of your property has the bearing capacity to allow the sustainability of your home expansion project.

You need a personalized construction plan

As you can see, the role of the architect greatly surpasses the concepts of durability of your enlargement and sealing of the roof and walls!

It will best balance the concepts of solidity, functionality and aesthetics. It will take into consideration environmental, geographic, cultural, social, technical elements …

Each enlargement of the house being thus personalized, it is unthinkable that the sketches and plans of your enlargement of the house could be used on another site or for another client.

A trusted architect will concoct you a quality house enlargement while respecting the budget and the deadlines set.

How much does an architect cost for an enlargement of the house?

The costs of using the service of an architectural professional being fixed according to an hourly rate, prepare to meet your architect in house enlargement knowing exactly what budget you want to invest in your project and having a clear idea of why you want to expand your home and the configuration of your future home extension .

Planning a home extension project: the stages

Plan approximately at least three (3) months of preparation to complete the various stages leading to the start of work to expand your home.

The first steps will consist of:

Apply for permits from the town planning department of your municipality. Is it possible to add a floor in your area? Does the zoning by-law allow an extension of the house? What restrictions and requirements are to be met?

Meet a mortgage broker to assist you with the analysis of your budget as well as your loan.

Make an appointment with a real estate broker for, for example :

  • assess the profitability of adding new complete accommodation with an independent entry for possible rental
  • estimate the added value that the house extension work will add to your home,
  • sell the house of your aging parents who will come to settle with you (enlargement for an intergenerational home).

Consult an architect for a feasibility study on :

  • the state of the structure of your existing home,
  • the ability of the soil to receive the weight of a house enlargement,
  • the perfect place to expand your home and
  • accessibility to the field.

A surveyor will then establish the margin of the ground if necessary.

An architecture technologist could draw 2D sketches depending on the addition of space that would meet your needs and the possibilities of your home. Different proposals can be presented to you.

The draft of the preliminary 3D plans will then be carried out in order to suggest the combination of materials, the design of the design, the development of the architecture, the arrangement of lighting …

If the presumed costs correspond to the planned budget and you accept these detailed final plans, these will be given to the contractor for the execution of the works.

The next step is to send bid requests to competent contractors who can expand your home. The service proposals that you will receive will be established from the implementation plan to which you have given your approval.

Using House Soumissions is like having all the specialists you need under one roof. Soumissions Maison is a network of more than 300 partners (house enlargement specialists, entrepreneur, excavators, brokers, etc.) who have joined our web platform to offer their service.

By filling in a single request for tenders, using the form on this page, you receive free, without delay and without obligation, up to three (3) service proposals from the professional (s) you need for your enlargement. from your area.

The entrepreneur specializing in house enlargement, who will have caught your attention, will purchase the materials …

And your project can finally start to take shape with the preparation of the site, the casting of foundations or the concrete slab or the screwing of the stakes (if required), etc.

Example of the steps to be taken to add a floor

Adding a floor usually takes six (6) to eight (8) weeks. However, it may happen that the work is up to 12 weeks. To start, you will need to:

  • install scaffolding
  • undo the existing roof,
  • dismantle the exterior coating,
  • knock down the walls,
  • preserve the tightness of the existing floor (in case of bad weather) …

Then entrepreneurs specializing in adding a floor :

  • will go up the exterior walls,
  • will install doors and windows
  • will build the roof,
  • will lay the shingles
  • will execute the exterior and interior finish,
  • will build the stairs to go up to the upper floor,
  • will install new doors and windows
  • etc.

How to choose your general contractor ? Expertise for the work

When the detailed final plan (execution plan) is completed and includes all the elements that will be useful for the expansion of your home, you must choose and meet the entrepreneur who can complete your home extension project , at a realistic cost.

This step requires a lot of precautions, because the entrepreneur on whom your choice will stop must have enough experience with regard to the enlargement of the house and have all the certifications and permits required for you to be covered in case of recourse.

It is recommended to contact people who have already had a house extension to have their opinion about their entrepreneur. If you do not know it personally, you have surely seen such work in your area. The owners of the house that has been enlarged will certainly be proud to show you the work accomplished, to tell you about their experience and to give you the names of their entrepreneur and his company.

Another solution is to contact the ACQC (Consumer Association for Construction Quality) to request the names and addresses of customers who have enlarged their homes (minimum three names).

Ask these people about the

  • meeting deadlines for work
  • from the pre-established budget
  • plans that have been given to the contractor they did business with.

Also ask questions about

  • its management of the workforce on the site
  • of the latter’s cleanliness
  • and the quality of the finish

Are not among the 6% of calls received by the ACQC annually in connection with complaints against renovation contractors. Take the time necessary to do your research and receive at least three (3) submissions as detailed as possible to compare them.

Do not hesitate to complete the submission request form on this page. Upon receipt, Soumissions Maison will send it to partner entrepreneurs in your area with the expertise and professional know-how to carry out your project at a competitive cost.

Entrepreneurs specializing in home extension, adding a floor, adding a garage, adding a basement … who will receive your submission request will assess your project at its fair value and prepare a written service proposal based on the detailed final plan (execution plan).

What is the content of a good submission for a house extension project?

The submission received should include all the parameters for proper management of your home expansion project such as:

  • your contact details as well as those where the work will take place,
  • contact details, license and license numbers of the entrepreneur,
  • a detailed description :
    • various works,
    • associated costs and
    • materials used (characteristics and quantity),
  • the start and end dates of each intervention,
  • penalties if there was an overflow of time,
  • the date of repossession of your home and the final cost,
  • payment terms,
  • a written document by which the entrepreneur undertakes to comply with the codes and standards in force,
  • proof of liability insurance:
    • insurance policy number and
    • company name,
  • proof of the guarantee guaranteeing omissions or professional faults,
  • etc.

You can agree with your contractor to be responsible for the acquisition of the necessary certificates, authorizations and permits. Submission should ideally include the exact name of the person responsible for these requests.

The work plans must also be annexed to the submission.

Financial institutions are very careful and demanding when a loan request for large-scale renovations such as the expansion of a house is presented to them. It is recommended to meet potential lenders with precise and well detailed information.

Beware of bids whose price is so low that it seems unreal

If the entrepreneur has made mistakes in his assessment of your home expansion project, you can expect additional costs along the way.

It is also possible that he simply does not have a permit, certifications, professional liability insurance or that he does not offer any guarantee, in which case, you have no recourse if problems arise.

BEFORE signing a contract with an entrepreneur, ask him to present his license to the Régie du Bâtiment du Québec (RBQ). Record its license number, expiration date and subcategories (see subcategories 1.2 and 1.3). Remember that only entrepreneurs who have an RBQ license have the legal authorization to carry out (or have performed) construction, renovation or house expansion work.

Also make sure that your potential contractor can prove to you that he has civil liability insurance in the event that material damage occurs to your property or to neighboring property during the expansion of your home.

It is also advantageous for you to resort to a company which provides a guarantee guaranteeing the omissions or professional faults perpetrated by an entrepreneur. Ask about the precise terms of the renovation guarantee plan and its restrictions (the accepted construction defects, the amount and duration of the guarantee, etc.).

There are organizations whose purpose is to protect you from fraudsters and potential malicious entrepreneurs.

Standards & laws for home enlargements

Before starting a side extension of the house (or by the backyard), adding a garage, adding a floor or adding a basement, make sure that the contractor or any other person responsible for the work has taken all the administrative steps required.

Municipal construction permit, compulsory for your house enlargement

The completion of a house enlargement is conditional on obtaining an authorization from the town planning service of your municipality

As the construction permit is compulsory, display it in plain sight to avoid having to curb your project or start work that you cannot complete.

Regardless of your municipality, you will need to submit several documents when applying for a home expansion permit:

  • proof of ownership,
  • location certificate (copy),
  • implementation plan,
  • photos,
  • cost of works,
  • peculiarities of the association of grafted walls with existing walls,
  • various architectural plans (drawing to scale and comprising precise quantities) :
    • planned enlargement,
    • side walls …
  • etc.

According to what you said, in the magazine Protect yourself, Mr. André Gagné, director of technical expertise at the Association of Construction and Housing Professionals of Quebec (APCHQ): Check, on the website from your municipality, if this situation prevails in your locality.

It may happen that specific documents may be requested of you in more complex situations. For example: the addition of a basement (excavation), the casting of a foundation in clay soil, declared unstable, in a flood zone or declared heritage.


Please note that since January 2002, certain regulations within the city have sometimes been divided with its districts. Often, changes have been made to the rules of the municipalities of the past.

To make sure you follow the right procedures, consult the page on the internet that allows you to search for municipal regulations in the Montreal metropolitan area.

Costs may vary from sector to sector. Do not fail to check these details before expanding your home.

Example of a 2019 tariff for a permit in the Rosemont La Petite-Patrie district:

$ 9.80 per $ 1,000.00 tranche

To rebuild or add a building with a maximum of 25 meters.


The construction of a shed or a shed of less than 15 meters does not require a permit.


Quebec City has posted a document online that displays the owner’s obligations when he wishes to expand his home.

This clearly states that a specialist (a certified contractor or technician) has the right to complete this documentation for you if you do not wish to do so.

The preparation of these documents is necessary when you request the approval of your license:

  • The implantation plan
  • The height on the side and behind of your addition
  • A copy of your current location certificate
  • The types of walls (the materials used)
  • Your expansion plan
  • Etc. (see their website)

Using the Quebec City online tool, we obtained this information for the addition of an annexed garage to a main home.

For a house in the district of La Haute-Saint-Charles, it is stipulated that you must obtain a permit without mentioning its cost.

If you complete this Quebec City permit application form, and follow the preparation guides found on the site, you will have the mandatory documentation at your request.


All price details are available in the town planning regulations of the city of Gatineau (dated May 1, 2019).

Example: if you want to enlarge your house and add accommodation or a rental room to it, here are the regulations in force.

For each $ 1,000 portion of the work price, your license will cost $ 3.30 (with a minimum of $ 80).

If your work involves a residential home, count $ 50 for the permit up to $ 20,000 of the total works price.

Add $ 2 per additional $ 1,000.


A very practical portal for the citizens of the city of Longueuil is available online. They have access to it at all times. Owners can even follow their request without leaving the house.

+ $ 5 per square meter of your enlargement

To enlarge your residential building.


The list of costs for the various permits (and certificates) issued by the city of Trois-Rivières informs you of the costs for each project.

For example, there are the costs for adding accommodation to a house:


For the city of Sherbrooke, citizens consult the regulations (detailed in a grid) on the official website of the municipality. This list posted online in 2018 was still up to date during our visit in May 2019.

You must obtain a construction permit when you make changes to your main building or for an accessory building (such as a garage).

Here are the details :

Energy efficiency standards

Issued by the Régie du Bâtiment du Québec (RBQ), compliance with these is required by certain municipalities, including Quebec.

As the owner of your home, you can very well apply for a home expansion permit from your municipality, but by using the service of a specialized entrepreneur in your region, who has all the expertise relating to these administrative procedures, you will save a lot of time and you will have peace of mind.

By completing the submission request on this page, you will receive free and prompt access to three (3) service proposals from entrepreneurs specializing in house enlargement without any obligation on your part.

RBQ license, compulsory for all construction contractors … even you!

If you wish to act as a construction contractor while expanding your home, you may need to apply for a license from the Régie du Bâtique du Québec (RBQ).

This organization ensures that the work carried out is in conformity, that the professionals and stakeholders involved have the required professional qualifications and that they are honest.

Other administrative tasks will be devolved to you. Among other things, you will need to:

  • assured you that all subcontractors have their certification from the CCQ (Quebec Construction Commission),
  • send a report to the CCQ each month on the hours worked and the wages granted
  • act in accordance with the collective agreement,
  • participate in various construction industry funds,
  • adopt the :
    • RRQ (Quebec annuity),
    • RHDCC (Human Resources and Skills Development Canada),
    • MRQ (Ministry of Quebec Income),
    • CSST (Commission for Occupational Health and Safety)

In addition, if you act as an entrepreneur to expand your home, you will not be allowed to benefit from the New Residential Buildings Guarantee Plan. The latter offers protection to owners in the event that an entrepreneur has done certain work poorly.

It is therefore in your interest to use the service of a regular entrepreneur who has the experience, skills and knowledge to take charge of your home expansion project and who will be able to complete it by respecting all standards and all regulations.

The CCQ and the management of workers participating in your house enlargement

Law R-20, under the Quebec Construction Commission (CCQ), relates to the supervision of all workers working in the construction field.

It stipulates that all those involved (manually) in the expansion of your home must be: either an entrepreneur (or a designated representative), an employer or an employee.

So, if yourself, your friends or family members who have come to help you expand your home do not have recognized qualifications or legal permission (RBQ …) to work on the site or if they are not paid at the rate provided for by the Code, you may have to face challenges from the CCQ, the RBQ, the Quebec Ministry of Income (MRQ) or the CSST .

It is recommended to use the service of professionals with all the certifications and all the permits required to carry out the extension work of your house or to add a garage, a basement or a floor to your house. All House Submissions partners are in good standing with all the organizations involved.

The financial aspect linked to the use of a professional entrepreneur should not slow down your procedures. There are a range of programs that can help you from a budgetary point of view.

Government grants and programs

Several financial assistance programs have been put in place to help you renovate your home to make it more energy efficient, and therefore healthier.

The ecological aspect of adding a floor, a house extension or adding a basement, in order to develop new housing for example, can therefore advantageously influence the side financial of your project.

Here is a non-exhaustive list, updated in February 2017, of programs and grants that could kick off your home expansion work.

Government energy efficiency programs

  • Renovert, initiated by Revenue Québec, offers until March 2017 a tax credit for residential renovations which will have a positive impact from an environmental or energy point of view.
  • Renoclimat, initiated by Énergie et Resources naturelle Québec, provides financial assistance for sealing and insulation works or for the installation of mechanical systems.
  • Novoclimat 2.0, initiated by Énergie et Resources naturelle Québec, encourages constructions with high energy performance. The contractor responsible for the project must however be accredited Novoclimat 2.0
  • Energy efficiency subsidies, a project initiated by Gaz Métro for Gaz Métro customers, facilitates the acquisition of hot water devices offering increased efficiency, programmable thermostats …

Financial products for your house enlargement

  • Green home offer, initiated by Desjardins, rewards ecological renovation by offering the most advantageous and attractive mortgage loan currently available on the market.
  • Green house, initiated by the SCHL, offers a certain percentage of repayment on the mortgage loan contracted with the latter to build or renovate in order to increase energy efficiency
  • Energetic homes, initiated by Genworth Canada, offer a 10% refund on their mortgage insurance premium.

Municipal subsidy programs

  • The financial aid for the housing of the City of Montreal subsidizes programs relating to foundations of residential houses, renovations …
  • Improvement of housing, Ville de Québec, offers a financial assistance program for residential renovation in historic districts, among others.
  • Renovation program in Varennes, Victoriaville and Saint-Valérien is a subsidy program that offers the opportunity to make your home more energy efficient and ecological through the use of sustainable materials, for example.
  • etc.

Ask your municipality to benefit from all the programs in place.

Some tips for your plan to extend or add a floor

Your property is probably the most important investment you have made in your home.

Here are some tips to make sure you take all the necessary precautions before doing major work such as adding a floor or extending your home. Make sure your dream doesn’t turn into a nightmare.

Adding a floor to your garage will create a space that you can arrange as you see fit and will provide undeniable added value to your home. However, it is recommended that you always have the lift capacity of the structure of your current garage checked before adding a floor below it.

The expansion of a bungalow by adding a floor is a large-scale project often contested. Transforming a bungalow into a cottage requires complete demolition of the roof, which results in rather high costs. It is better to think carefully and target your exact needs.

Make sure you integrate the new floor or the extension of your home

  • in the exterior style of your home: chat with a professional designer or your architect. Dare new shapes or new materials. When your home is enlarged, it may very well look like a newly built home.
  • to interior design: lengthening your home may involve a redistribution of the rooms, or even a displacement of the front door. Organize the coherence and balance of your home’s expansion with your architect or a specialist house enlargement advisor.

Don’t forget the sunshine. Take a good look at the possibilities of orienting your home addition or extension and plan the window, lighting, the light shaft … consistently.

Add a clause providing for sanctions in the event of an overrun, when you sign the contract drawn up in accordance with the recommendations of the Building Authority. This is a situation that happens frequently.

When studying the different funding options, always plan a 25% financial reserve cushion for unforeseen events that will certainly arise.

Pay the contractor as the different construction steps are completed. Ask the contractor for proof that the suppliers’ invoices have indeed been paid. Indeed, if a supplier remains unpaid, he can ask you to give him the money due, even if you have already paid this money to the entrepreneur.

Think of the ghost costs. Although the square foot cost of your house enlargement should not be underestimated, you also need to budget the architect’s fees as well as the amount of the license to build your garage addition, addition of a floor, addition of a basement or your house extension.

Do not take up the challenge of a house expansion project alone. A project of such scope should be considered in the same way as a new construction. This is not a trivial project, so do not try to meet the challenge of expanding a house without the help of professionals.

You are thinking of expanding your home in Quebec: Questions and Answers

It often happens that an owner decides to increase his living space or storage by adding a floor or a building connected to his home. If you are in this situation, it is normal to wonder about the consequences of your choice.

We have compiled the main questions and their answers here to lighten your research.

If you expand your home without a license, what are the dangers ?

Without a license, the consequences can be very unfortunate. For example, a Montrealer in his forties will have to demolish his porch since he did not meet the criteria of his district (in Mercier-Hochelaga-Maisonneuve).

So do not take a chance and check the contact details of your municipality with this tool (supplied by Municipal Affairs and Habitation of Quebec) accessible to all citizens of the province.

What to do with the construction permit during the expansion work ?

While your renovations are underway, put your license in sight. The inspector in your district may always come to examine the work a few times.

When receiving your file, the city received the plans for your project. This inspector will make sure that everything is done in order and that your permit for the transformation or construction of a building is visible.

Which CRMs are receiving financial assistance to repair the damage caused by pyrrhotitis ?

The Société d’habitat du Québec manages this program in place which lightens the burden of owners having to repair the damage or redo their basement attacked by pyrrhotite.

If this is your case, you could reduce your costs by 75%.

If you live in these MRCs, contact your municipality to initiate the procedures:

  • Shawinigan
  • Nicolet-Yamaska
  • Antoine-Labelle
  • Chenaux
  • Trois-Rivières
  • Mekinac
  • Maskinongé
  • Snap

What is the first thing to do if you want to expand your home ?

As soon as you decide on your type of enlargement, communicate with the municipality to find out what is specific to your region. Normally, you will need to provide your location certificate first for the limitations to be revealed.

If you are already doing business with a construction contractor, he will often offer support during the submission of your project.

Basically, if you want to borrow a sum from your financial institution, will inquire about the value of your property. Your bank will grant the loan if it believes you are recovering your money at the time of the possible sale of your home.

If your goal is to increase the value of your property, do you have to do the work yourself ?

If you have the necessary skills (and time), why not. Note that only an impeccable finish will increase the value of your home.

To do this, always avoid :

  • Lower quality materials
  • The assistance of a “jobber”, in other words an amateur

In the future, when the time comes to sell your home, your visitors (often accompanied by a real estate broker) will analyze every detail in front of them.

The goal will be to impress them, so do not push back the help of a professional on your site.

Should you add a floor to a bungalow ?

Absolutely ! Take the time to search the internet a bit or ask entrepreneurs for the photos from the day after on bungalows transformations.

The building will often undergo such great alterations that it becomes unrecognizable:

You will quickly notice that a bungalow on which we add a floor is transfigured: equipped with a redone facade, new windows and probably a brand new pediment, this one gains in chic while considerably enlarging the occupant living area.

Which enlarged Quebec house is the most expensive on the market ?

If you were trying to guess the answer, it is a safe bet that old news from the media has misled you.

Céline Dion the most expensive house before (in 2016). It then stood out a little above 25 million dollars: a whole sum for the city of Laval. Located on Gagnon Island, a little east of Boisbriand, this castle took hold after just over 2 years on the market.

The current champion at the provincial level is in Montreal. Built in 1913, with 67 pieces, on a property of 2 ½ acres, then completed by its next owner (John Wilson McConnel, the editor of the Montreal Star), this house experienced several enlargements which gave it value.

The price of this manor: 40 million.

If you have a shoebox house in Montreal, do you have the right to add a second floor ?

Yes, but you will have to follow certain rules to keep the stamp and the historical side of the “shoebox”.

There are 561 “shoebox” type residences in Montreal, divided into 3 degrees of architectural value, 1, 2 and 3.

Owners of a “shoebox” wishing to enlarge it should previously communicate with the town planning division of its district to inquire about the criteria specific to its situation.

How to build your movie theater at home ?

First of all, know that a movie theater should occupy a place far from the main rooms.

The common choices :

  • A well-heated garage.
  • A basement with a fairly high ceiling.
  • A room away from the passing areas.

Remember to calculate an adequate distance between the spectator seats and the screen. Then, will you adopt the good old light canvas to accommodate a projector or opt for a state-of-the-art television ?

If your choice stops on the canvas, think about the space necessary for an effective projection. No one likes to watch a movie if it has to constantly tilt your head or crash into its seat. Fortunately, modern canvases retract to allow you to use this room for something else.

Wiggle the prices for your device to choose well between the projector and the television.

Opaque curtains to prevent light from entering are mandatory to enjoy your movie theater.

To better appreciate your cinema, it is essential to properly soundproof your room and understand the basics of acoustics.

Learn more about :

  • types of walls as well as types of sound insulation
  • ideal windows to stop noise
  • the best type of carpet depending on your type of floor

When the time comes to renovate your home to enjoy a movie theater, contact our specialized partners to get answers to your questions and free submissions for your project.

What type of floor should you put in your enlargement ?

It’s simple !

Good ideas

  • Good quality clean wood floor, installed by a professional.
  • Regularly varnish your wooden floor to protect it.
  • Any floor that does not trap dust is a +.

“So-so” or medium ideas

  • A poor quality varnish on your clean wood floor.
  • A floating floor because it will decrease the “wow” effect of your property.

Bad ideas to banish

  • Do the work yourself if you are not a specialist.
  • Use machines without knowing how they work.
  • Tap your floor with a carpet.

Compare the prices for your house enlargement by a qualified general contractor

Like many others, you too are cherishing the idea of expanding your home ?

To compare the prices of adding a basement, adding a floor, adding a garage or expanding your home submitted by various professional and qualified contractors, contact us in (855) 280-0106 or fill in the tender request form on this page.

House enlargement advisers, House submissions partners, will be happy to answer your questions and accompany you on your project.

Surround yourself with the best professionals for your project thanks to Soumissions Maison !

Soumissions Maison is a web platform on which more than 300 companies and professionals in the real estate field have gathered: house enlargement specialists, entrepreneurs, mortgage loan brokers, notaries, real estate brokers, licensed assessors, home automation, excavators, landscapers , etc.

All regions of Quebec are represented by members of the network, who have been selected according to rigorous criteria, including the possession of all permits, insurance and certifications required by their area of expertise.

The next step: receive your 3 free bids

The expertise of members of the House Submissions network will protect you, as far as possible, from cost overruns. It is a pledge of certified and qualified professionals, who have already carried out house enlargements and who know the costs of carrying out a project like yours.

Having all the capacities to ensure their commitment, they will undertake the process of applying for a permit with your municipality so that the start-up does not show any delay from the start. They will also contact their subcontractors and reserve their service so that the deadlines are respected.

As site manager, they will regularly carry out visits to inquire about the smooth running of operations as well as compliance with regulations, standards and plans.

Do not hesitate to contact House Submissions for your plan to add a garage, add a floor (complete or partial), add a basement (complete or partial), add a overhang, adding a door to the side, adding a turret or house extension by the sides, by the backyard or even, by the facade.

  • It’s free
  • Without commitment
  • And easy !
  • I am very surprised and pleasantly satisfied with the service of your platform. You made my life easier with your professionalism. Thank you!

  • It was a first experience with your site, I will recommend it and reuse it if necessary. I have found that your bidders are punctual and professional.

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