Ottawa's older neighbourhoods, from Alta Vista to Manotick, are full of basements sitting half-used, and with winters this long, a finished lower level pays for itself in extra living space fast. This list was put together by reading contractor websites, Google and HomeStars review pages, and public directory listings for companies that specialize in or regularly take on basement finishing work across the Ottawa area. Nine businesses turned up with enough verifiable detail to include here.
1. Vanguard Contracting
Area: Ottawa, Nepean, Kanata, Orleans, Gloucester, Barrhaven, Stittsville, Rockcliffe Park and Gatineau · Specialty: basement renovations, including framing, insulation, drywall, flooring, electrical, bathrooms and entertainment spaces · Rating: 5.0 on Google
Vanguard runs full-service basement projects from design through final inspection rather than subcontracting out pieces of the job, and its Ottawa page leans on "transparent communication" as a selling point. It's a good fit for homeowners who want one point of contact managing framing, electrical and finishing under a single roof.
2. Ottawa Finished Basements
Area: Ottawa and surrounding areas · Specialty: basement renovation exclusively, including in-law suites, home theatres, gyms and laundry rooms
This company only does basements, which is unusual in a market where most contractors also chase kitchens and bathrooms. The owners cite more than a decade of combined basement-specific experience, and the business backs its work with a three-year warranty and BBB membership. Worth a look for anyone who wants a specialist rather than a generalist renovator.
3. Ottawa General Contractors
Area: Ottawa, Nepean, Barrhaven, Kanata, Stittsville and Westboro · Specialty: design-build basement renovations with a fixed-pricing model · Rating: 4.4 on Google (200+ reviews)
OGC is one of the larger players on this list, with over a decade in business, membership in GOHBA, Tarion, RenoMark and CHBA, and past recognition as Ottawa's Small Business of the Year. The fixed-pricing model is the standout detail here: customers get a locked-in quote before work starts rather than a rough estimate that creeps upward. Suited to larger, full-suite basement builds where budget certainty matters.
4. Renco Home Improvements
Area: Ottawa · Specialty: foundation crack repair, basement waterproofing and basement renovations · Rating: 4.9 on Google (37 reviews) · Since: 2002
Renco is led by owner Terry Fraser and has been operating in Ottawa since 2002, longer than most names on this list. Its niche is basements that need structural or moisture work handled before the drywall goes up, which makes it a sensible first call for older homes with a history of leaks or foundation cracks rather than a purely cosmetic finish. Projects come with a transferable warranty.
5. Jack Built
Area: Stittsville, Kanata, Barrhaven, Richmond, Nepean, Orleans, Manotick and Westboro · Specialty: deck building and basement renovations
Jack Built is based in Stittsville and splits its business between decks and basements rather than offering a full menu of home renovation categories. Customers describe the crews as organized with clean job sites and easy communication throughout the build. A solid option for homeowners in the west end who also have an outdoor project in mind and want the same crew for both.
6. On Point Renovations
Area: Orleans, Kanata, Stittsville, Nepean, Manotick, Kemptville, Gloucester and Barrhaven · Specialty: basement finishing, plus bathroom, kitchen, tile and flooring work · Since: 2020
On Point was started in 2020 by two Ottawa-raised construction professionals with a combined 20-plus years in the trades before launching the company. It's newer than most on this list but has picked up consistent praise on Facebook and Yelp for arriving on time and finishing small-to-mid-size jobs quickly at a reasonable cost. A reasonable choice for a straightforward basement finish that doesn't need a large firm's overhead.
7. Done Right Renovations
Area: Kanata, Stittsville, Orleans, Nepean and Barrhaven · Specialty: basement renovations alongside bathroom and kitchen remodeling
Done Right is a family-owned, BBB-accredited operation based out of Kanata. Customer accounts describe multi-year relationships across repeat projects, with reviewers pointing to detailed upfront quotes and jobs that landed on schedule and on budget. Best suited to homeowners in the west end who value a contractor they can call back for the next project too.
8. Select Urban General Contractors
Area: Nepean, Barrhaven, Kanata, Stittsville, Carp, Vars, Vanier, Orleans, Russell, Manotick, Alta Vista and Westboro · Specialty: basement apartments, playrooms, gyms and entertainment rooms
Select Urban covers one of the widest service areas on this list, reaching rural edges like Carp, Vars and Russell that some Ottawa-based crews skip. The company cites more than 10 years of experience and lists basement apartment conversions specifically among its work, which suits homeowners weighing a secondary-suite build rather than just a rec room.
9. CP & Son
Area: Ottawa (with two local locations) · Specialty: basement renovations, plus kitchens, bathrooms, additions and exterior work
CP & Son describes itself as a "local homegrown construction company" with more than 15 years in the trade, running out of two Ottawa locations rather than a single office. It positions basements as one line among a broader renovation practice, which can suit homeowners who want the same contractor to eventually handle upstairs work too.
How We Built This List
This list was compiled from public web sources, including contractor websites, Google review pages, HomeStars and BBB listings, and general search results, all reviewed in August 2026. It is not a paid placement and no business on this list has any affiliation with ottown or its operator. Ratings, review counts and founding years are included only where a source we read stated them directly; where sources disagreed or a detail couldn't be confirmed, it was left out rather than guessed. We did not visit or test any of these companies ourselves, and homeowners should still get multiple quotes and check current reviews before hiring.
Source: Top Basement Renovation Companies in Ottawa for 2026 and each company's own website.
