This list ranks 10 home addition contractors in Toronto, ON. It starts from Google Maps searches for home additions and related building work in Toronto: 132 firms were checked, and building and renovation firms with their own website and an open Google listing went forward. Firms are weighed on their Google rating, the number of reviews behind it, how closely their services match home addition work, and their portfolio. The strongest firm overall sits at place 1, places 2 to 4 carry a badge for what each suits best, and places 5 to 10 run in order. Ratings and review counts are Google's, checked October 14, 2026. How we rank
Custom home builder based in Concord, Ontario, also working as a general contractor and interior construction contractor.
GTA custom home builder that also offers framing, additions, foundations and roofing in Toronto and nearby cities.
Toronto design-build firm handling home additions, custom homes, major renovations and basement underpinning across the city's neighbourhoods.
Toronto renovator and home builder handling bathroom additions and remodels, kitchens, basements and custom homes around the GTA.
North York custom home builder and construction company that also takes on home additions.
Vaughan custom home builder taking on new custom homes and home additions in Vaughan and Toronto.
| Rank | Firm | Best for | Services | Google rating | Area |
|---|---|---|---|---|---|
| 02 | JP Lucky Construction | Framing and foundations | Home additions · Custom homes · Framing · Foundations · Roofing | Rated 4.9 out of 5 from 149 Google reviews | Toronto |
| 03 | Addison Design & Build | Additions with basement lowering | Home additions · Custom homes · Home renovations · Basement underpinning · Basement lowering | Rated 5.0 out of 5 from 47 Google reviews | Toronto |
| 04 | Arham Home Builder & Renovator | Bathroom additions | Bathroom additions · Bathroom renovations · Kitchen renovations · Basement renovations · Custom homes | Rated 5.0 out of 5 from 52 Google reviews | Scarborough |
| 10 | The Epic Builders | Family-run design-build homes and additions | Custom homes · Full home renovations · Home additions · Kitchen renovations · Design-build | Rated 5.0 out of 5 from 30 Google reviews | Toronto |
Five things to confirm with any firm, on this list or not, before you sign. The rules below are Ontario's and Toronto's.
Ask the firm for a clearance certificate from the WSIB, which confirms it is registered for workers' compensation and its account is in good standing. The certificate confirms the firm is registered with the WSIB and up to date on its premiums, so check its dates cover your job.
Ask for a certificate of insurance that names the firm and shows commercial general liability coverage in force for the dates of your job, and check that the subcontractors it brings in are covered too.
Building permits for homes in Toronto come from the City of Toronto, and every addition needs one, and often a zoning review first. Agree in writing who applies for the permit and books the inspections.
Get the scope of work, the payment schedule tied to stages of the work, start and finish dates, how changes are agreed and priced, and who handles permits and cleanup, all in one signed contract before any work starts.
A renovation is not a new home, so the new home warranty rules usually do not apply: get the firm's own workmanship warranty in writing, with what it covers and for how long. Renovators in RenoMark, the Canadian Home Builders' Association program, offer a minimum two-year warranty on their work.
The 10 firms on this list fall into 4 groups, read from what each firm's own site says it does and how it is listed on Google.
Home builders build new houses as their main work, and some take on additions and major renovations too.
Design-build firms design the project and build it under one contract, so one firm answers for the drawings and the work.
General contractors run building projects of many kinds and bring in the trades each job needs.
Renovation companies renovate existing homes, one room at a time or all of it at once.
Yes. An addition changes the footprint or height of the house, so it needs a building permit and often a zoning review for setbacks and lot coverage. Plans are usually drawn by a designer or architect before the permit application goes in.
Often, but the existing foundation and walls have to carry the new load. An engineer checks the structure before design starts, and the contractor builds to those drawings.
A survey of the lot, a check of the zoning rules for setbacks, height and lot coverage, drawings by a designer or architect, an engineer's review where the structure is affected, and the building permit. Ask the firm which of these steps it handles and which it expects from your designer.
Often. Most of the work happens outside the existing walls until the new space is joined to the house. Expect noise and dust, and a few days without power or water when the addition is tied in.
Ask the firm for a clearance certificate from the WSIB. The certificate confirms the firm is registered with the WSIB and up to date on its premiums, so check its dates cover your job.
Building permits for homes in Toronto come from the City of Toronto. For home addition work, every addition needs one, and often a zoning review first. Many firms apply for the permit as part of the job, so agree who does it before you sign.
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Send the detail that is out of date, or the name and website of a firm that belongs here.
