Home extension

We know how stressful it can be to undertake a home renovation project. That's why we’re here to support you at every project stage, from planning to construction. From facilitating your search for a vetted general contractor to ensuring that your renovation goes smoothly, you can rest assured that your project is in good hands. We’ll be your right-hand person advocating for your vision all the way through so that the final results meet your expectations.

Per square foot, the average cost of a home extension is approximately:

Extended room that is structurally separate from the house foundation:

Standard: $310

Mid-range: $370

High-end: $440

Extended room that is a part of the house foundation:

Standard: $420

Mid-range: $440

High-end: $495

The price of your renovation will also depend on the scope of the project. Our Project managers will help you define your project scope and send you a detailed budget estimate before you meet with general contractors.

For a better idea of how much a home extension will cost, use our home extension cost estimator.

Billdr will help you find the right general contractor for your project. All of the general contractors we work with have gone through a rigorous vetting process to ensure high-quality craftsmanship and strong work ethics. Through our network, you’ll be able to choose from qualified and reliable contractors with valid licenses and insurance that covers personal injury and property damage.

Tell us about your project to set up a personalized phone call and home visit to assess your renovation needs. As soon as your detailed project scope and budget estimate are ready, your project will be live on our network of certified general contractors. Depending on your project’s size, you will then receive two-to-three comparable quotes to choose from.

Since walls or roofs may be altered during a home extension, summer is the ideal time to do this kind of project. In order to have your project in progress during the warmer months, we suggest beginning the planning phase in the spring so you can be ready and equipped to start your project once summer arrives. 

A building permit is required if you plan on modifying how a room is being used (e.g. adding a bathroom, converting a bedroom into a kitchen, adding an extension, etc.) or changing the outside of your property (façade, windows, etc.). To find out if you need to apply for a permit, check with your municipality. You can also read our guides to learn more about building permits in Toronto or building permits in Montreal.

Changes to your project that occur once construction has started are called change orders. Navigating them can be tricky, but that’s why your Billdr project manager is here to help. You can send your change requests to your general contractor in writing, but make sure that your project manager is included in all communications. Before any changes are made, ask what kind of impact these changes will have on your timeline and the costs of your project to avoid unwanted surprises.