This list ranks 10 basement renovation companies in Toronto, ON. It starts from Google Maps searches for basement renovations 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 basement renovation, and their portfolio. The strongest firm overall sits at place 1, places 3 and 4 carry a badge for what each suits best, and the rest run in order. Ratings and review counts are Google's, checked October 14, 2026. How we rank
Toronto construction company taking on basement renovations and general contracting work.
Toronto custom home builder and renovator handling full-home, condo, kitchen, bathroom and basement projects plus additions across the GTA.
Toronto general contractor doing basement, bathroom and large-scale home renovations, custom new builds and ADUs, plus commercial work.
Scarborough-based contractor doing full-home, kitchen, bathroom and basement renovations plus restoration work for GTA homes and businesses.
Toronto design-build studio doing kitchen, bathroom, basement and condo renovations plus full-home renovations and additions across the GTA.
Toronto general contractor and construction company taking on basement renovations.
| Rank | Firm | Best for | Services | Google rating | Area |
|---|---|---|---|---|---|
| 02 | Violet Build | Condo and full-home renovations | Basement renovations · Full-home renovations · Custom homes · Home additions · Condo renovations | Rated 5.0 out of 5 from 58 Google reviews | Toronto |
| 03 | The Reno Pros | Accessory dwelling units | Basement renovations · Home renovations · Custom new builds · Accessory dwelling units · Commercial renovations | Rated 5.0 out of 5 from 54 Google reviews | Toronto |
| 04 | SMS Contractors | Basement conversions by one crew | Basement conversions · Full-home renovations · Kitchen and bathroom renovations · Restoration · Commercial construction | Rated 5.0 out of 5 from 65 Google reviews | Scarborough |
| 05 | Elevate Home Renovation | Homeowners wanting one team to design and build | Basement renovations · Kitchen renovations · Bathroom renovations · Condo renovations · Home additions | Rated 5.0 out of 5 from 50 Google reviews | Toronto |
| 07 | HTR Basements | Full basement finishing with 3D design | Basement finishing · Basement design · Basement bathrooms · Basement kitchens · Built-in shelving | Rated 4.8 out of 5 from 26 Google reviews | Based in Richmond Hill |
| 08 | Basement Finishing Company | Basement apartments and finished basements | Basement finishing · Basement apartments · Kitchen renovations · Bathroom renovations · Full home renovations | Rated 4.6 out of 5 from 58 Google reviews | Concord, serves Toronto |
| 09 | Assured Basements | Basement finishing with detailed 3D plans | Basement renovations · Basement finishing · 3D floor plans · Project management | Rated 4.5 out of 5 from 162 Google reviews | North York |
| 10 | My Legal Basement | Legal basement apartments for rental income | Legal basement apartments · Basement construction · Architectural drawings · Bathroom renovations · Kitchen renovations | Rated 4.5 out of 5 from 107 Google reviews | Mississauga, serves 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 finishing a basement or adding a secondary suite usually needs one. 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.
Basement specialists work mainly on basements, from family rooms to secondary suites.
General contractors run building projects of many kinds and bring in the trades each job needs.
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.
It is the term Alberta builders and homeowners use for finishing an unfinished basement: framing, insulation, electrical, plumbing, drywall and flooring, often with a bedroom, bathroom or family room. Elsewhere it is usually called a basement renovation or basement finishing.
In many Canadian cities, yes, but a legal secondary suite has to meet the building code and local zoning, including a separate entrance, ceiling heights, fire separation, smoke alarms and egress windows. It needs a permit and inspections, so ask the firm whether it has built legal suites in your city.
Deal with water before finishing: grading and downspouts that carry water away from the house, a working sump pump where the house has one, and repairs to foundation cracks. Then insulate and frame in a way that handles moisture. Ask the firm what it checks before it starts framing.
Usually. A basement bathroom needs a drain connection, which can mean breaking the concrete floor to reach the main drain, or a pump system where the drain sits higher than the floor. The plumbing work needs a permit and inspection.
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 basement renovation, finishing a basement or adding a secondary suite usually needs one. Many firms apply for the permit as part of the job, so agree who does it before you sign.
What finishing or developing a basement costs in Toronto, Calgary, Edmonton and Vancouver in 2026: prices by size, add-ons, permit fees and the big-ticket scopes.
What a legal basement suite, second unit or basement apartment costs to build or legalize in Calgary, Edmonton, Toronto and Vancouver in 2026, and which code items set the price.
The code and zoning rules a basement suite, second unit or basement apartment has to meet in Ontario, BC and Alberta: ceiling height, fire separation, alarms, exits, heating and how many units a lot can hold.
Send the detail that is out of date, or the name and website of a firm that belongs here.
