This list ranks 10 basement renovation companies in Oakville, ON. It starts from Google Maps searches for basement renovations and related building work in Oakville: 109 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 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
Basement finishing company turning basements into second suites, walkouts, home theatres and gyms in Oakville, Mississauga, Burlington, Etobicoke and Milton.
Kitchen and bath renovation company with a Vaughan showroom, doing kitchens, bathrooms, basements and additions across Toronto and the GTA.
Owner-operated contractor finishing basements and renovating kitchens and bathrooms across Halton and the Niagara Region, including Oakville, Burlington and St. Catharines.
Full-service basement renovation company finishing, waterproofing and designing basements across Oakville, Burlington, Milton, Mississauga and the Hamilton area.
Hamilton basement renovation company converting unfinished basements into legal apartments, family rooms and home offices for homeowners in Hamilton and Mississauga.
GTA general contractor doing full home renovations, kitchens, bathrooms and basements, plus commercial projects.
| Rank | Firm | Best for | Services | Google rating | Area |
|---|---|---|---|---|---|
| 01 | Mr. Basement | Finished basements and second suites | Basement finishing · Second suites · Basement walkouts · Home theatres · Basement design | Rated 5.0 out of 5 from 35 Google reviews | Oakville |
| 02 | KB Oakville | Basements without subcontractors | Basement renovations · Bathroom renovations · Kitchen renovations · Home additions · Custom cabinetry | Rated 5.0 out of 5 from 21 Google reviews | Oakville |
| 03 | VDR Contracting | Secondary suites | Basement finishing · Secondary suites · Kitchen renovations · Bathroom renovations · Full-home renovations | Rated 5.0 out of 5 from 9 Google reviews | Oakville |
| 04 | The Basement Store | Basements checked for moisture | Basement renovations · Basement finishing · Basement waterproofing · Basement design · Income properties | Rated 4.6 out of 5 from 13 Google reviews | Oakville |
| 05 | First Class Remodeling | Legal basement apartments and basement finishing | Basement renovations · Legal basement apartments · Basement finishing · Kitchen renovations · Full house renovations | Rated 5.0 out of 5 from 2 Google reviews | Oakville |
| 06 | Renocorp | Full home renovations with layout changes | Basement renovations · Full home renovations · Kitchen renovations · Bathroom renovations · Commercial renovations | Rated 5.0 out of 5 from 1 Google review | Oakville |
| 07 | Finished Basement | Basements finished in two to three weeks | Basement renovations · Basement finishing · Basement design · Bathroom renovations | Rated 3.0 out of 5 from 2 Google reviews | Oakville |
| 09 | RQ Construction | Basement finishing and main-floor remodels | Basement finishing · Kitchen renovations · Bathroom renovations · Interior renovations | Rated 5.0 out of 5 from 79 Google reviews | Burlington, serves Oakville |
| 10 | GTA Contracting | Renovations with flooring and tile work | Home renovations · Kitchen renovations · Bathroom renovations · Basement renovations · Water damage restoration | Rated 5.0 out of 5 from 67 Google reviews | Oakville |
Five things to confirm with any firm, on this list or not, before you sign. The rules below are Ontario's and Oakville'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 Oakville come from the Town of Oakville, 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 3 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.
Renovation companies renovate existing homes, one room at a time or all of it at once.
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 Oakville come from the Town of Oakville. 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.
