Basement renovations

The 10 Best Basement Renovation Companies in Ottawa, ON

Updated 81 firms checked10 ranked

This list ranks 10 basement renovation companies in Ottawa, ON. It starts from Google Maps searches for basement renovations and related building work in Ottawa: 81 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

Select Urban General Contractors

Best overall

Ottawa general contractor renovating kitchens, bathrooms and basements, building home additions and taking on full-home and bungalow renovations.

Updated

Why it ranks here

  • Founded by Vasile Crecea, who started out in construction working alongside his father.
  • Portfolio includes full-home renovations such as the Milne home and a complete bungalow renovation in Pineglen.
  • Basement projects shown include one called Craighall and one in Stittsville, alongside bathroom work in Orleans.
  • Basement work covers in-law suites, home theatres, guest bedrooms and laundry areas.
  • Builds additions for rental space, new garages or a larger kitchen.
Basement renovations · Home additions · Full-home renovations · Kitchen renovations · Bathroom renovations Nepean
Visit website Call 613-581-3640
5.0 from 68 Google reviews

Ottawa Finished Basements

Best for in-law and rental suites

Ottawa basement finishing company building rental and in-law suites, home theatres, gyms and family rooms in existing basements.

Updated

Why it ranks here

  • Its staff have finished basements since 2005, and each owner has more than 15 years as a basement contractor.
  • Backs its basement work with a 3-year warranty.
  • Builds in-law and secondary dwelling units in basements, laid out to give each household privacy.
  • Family owned and operated, and offers clients a one-on-one design consultation.
  • Basement layouts include home theatres, home gyms, children's play rooms and finished laundry rooms.
Basement finishing · Secondary dwelling units · Bathroom renovations · Home theatres Ottawa
Visit website Call 613-882-3349
5.0 from 31 Google reviews

Remarkable Construction

Best for finish carpentry work

Ottawa general contractor and finish carpentry firm taking on renovations, basements, additions, new builds and damage repairs, led by owner Mark Ostapyk.

Updated

Why it ranks here

  • Had two finalist projects at the 2021 Greater Ottawa Home Builders' Design Awards, both in the renovation category.
  • Those finalists were a clapboard house in Ottawa West and a red brick bungalow townhome beside the Kanata Golf and Country Club.
  • Has built several semi-detached homes in Westboro and renovated apartment buildings as well as kitchens, bathrooms and basements.
  • Owner Mark Ostapyk was born and raised in Ottawa, began a four-year carpentry apprenticeship after his degree and started his career in Vancouver.
  • Also repairs fire, water and natural disaster damage, and does interior and exterior painting and electrical work.
Basement renovations · General contracting · Fine carpentry · Home additions · Damage repairs Ottawa
Visit website Call 613-808-9138
5.0 from 35 Google reviews

Kadri Construction

Best for epoxy basement floors

Ottawa general contractor doing basement, kitchen and bathroom renovations for homes, plus office, retail and restaurant fit-outs.

Updated

Why it ranks here

  • Lists 350+ projects and a team of 65+ people.
  • Completed the interior fit-out of the Lululemon store in Westboro in November 2024.
  • Takes residential and commercial jobs across Ottawa and Eastern Ontario, including restaurant, office and retail fit-outs.
  • Lays flake and classic epoxy floors in garages, basements and commercial spaces.
  • Bathroom remodels include waterproofing and tile work, and kitchen jobs range from full-gut remodels to targeted updates.
Basement renovations · General contracting · Kitchen renovations · Epoxy flooring · Commercial fit-outs Ottawa
Visit website Call 613-852-8070
5.0 from 33 Google reviews

PR Builder

Ottawa renovation and construction company doing basement finishing, kitchen remodels and full home renovations, plus landscaping and lawn care.

Updated
  • Service area covers Ottawa plus Nepean, Barrhaven, Kanata, Orleans and nearby communities.
  • Renovation work covers layout redesign, structural changes, flooring, custom carpentry, drywall, painting and lighting upgrades.
  • Works with homeowners, landlords and business owners, and also offers landscaping and lawn mowing.
Basement finishing · Kitchen remodelling · Home renovations · Landscaping Ottawa
Visit website Call 613-668-7050
5.0 from 28 Google reviews

Ranks 07 to 10

Basement Renovation Ottawa

Ottawa basement renovation company that also does basement bathrooms, flooring and water damage restoration after leaks and floods.

5.0 343-998-8804CallWebsite

JG General Contractors

Ottawa general contractor combining kitchen, bathroom and basement renovations with electrical service upgrades and lighting, for homes and businesses.

5.0 613-793-8710CallWebsite

Level Construction

Ottawa renovation contractor run by a carpenter, building additions, sunrooms, decks and porches and remodelling kitchens, bathrooms and basements.

4.6 613-836-1939CallWebsite

General Contractor Ottawa

General contractor

5.0 613-714-0398CallWebsite

Compare the firms

FirmBest forServicesGoogle ratingArea
01Select Urban General ContractorsBungalow and full-home renovations in OttawaBasement renovations · Home additions · Full-home renovations · Kitchen renovations · Bathroom renovations5.0Nepean
02Ottawa Finished BasementsIn-law and rental suitesBasement finishing · Secondary dwelling units · Bathroom renovations · Home theatres5.0Ottawa
03Remarkable ConstructionFinish carpentry workBasement renovations · General contracting · Fine carpentry · Home additions · Damage repairs5.0Ottawa
04Kadri ConstructionEpoxy basement floorsBasement renovations · General contracting · Kitchen renovations · Epoxy flooring · Commercial fit-outs5.0Ottawa
05PR BuilderBasement finishing and kitchen remodelsBasement finishing · Kitchen remodelling · Home renovations · Landscaping5.0Ottawa
07Basement Renovation OttawaBasements recovering from water damageBasement renovations · Water damage restoration · Basement bathrooms · Basement waterproofing · Flooring installation5.0Ottawa
08JG General ContractorsRenovations that include electrical upgradesBasement renovations · Electrical upgrades · Kitchen renovations · Bathroom renovations · Commercial fit-ups5.0Ottawa
09Level ConstructionAdditions, sunrooms, decks and porchesBasement updates · Home additions · Sunrooms · Decks · Kitchen remodelling4.6Stittsville

What to check before hiring a basement renovation company in Ottawa

Five things to confirm with any firm, on this list or not, before you sign. The rules below are Ontario's and Ottawa's.

  1. Registration with the WSIB

    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.

  2. Liability insurance

    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.

  3. The building permit from Ottawa

    Building permits for homes in Ottawa come from the City of Ottawa, and finishing a basement or adding a secondary suite usually needs one. Agree in writing who applies for the permit and books the inspections.

  4. A written contract

    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.

  5. The warranty

    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.

Types of basement renovation company in Ottawa

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.

General contractors4

General contractors run building projects of many kinds and bring in the trades each job needs.

Basement specialists4

Basement specialists work mainly on basements, from family rooms to secondary suites.

Renovation companies2

Renovation companies renovate existing homes, one room at a time or all of it at once.

Basement renovations in Ottawa: common questions

What is basement development?

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.

Can I add a legal suite in my basement?

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.

How do I keep a finished basement dry?

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.

Can I add a bathroom in my basement?

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.

How do I check that a contractor in Ottawa is registered with WSIB?

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.

Who issues building permits in Ottawa?

Building permits for homes in Ottawa come from the City of Ottawa. 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.

Before you get quotes

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