Replacing windows or doors in Ottawa means factoring in a climate that swings from deep winter cold to humid summers, which is why installation quality and warranty coverage matter as much as the product itself. This list was put together by researching public reviews on Google, HomeStars, Houzz and the Better Business Bureau, along with each company's own site, to find local operators with a real, verifiable track record.
1. Centennial Windows
Area: Ottawa and surrounding region · Rating: 4.2 on Google (438 reviews), 9.2 on HomeStars (414 reviews)
Centennial builds its windows locally for Ottawa's climate rather than sourcing from a national supplier. Reviewers consistently describe the installation crews as professional, clean and efficient, including praise for prompt emergency service. A minority of reviews cite service issues, so it is worth asking directly about post-installation support.
2. Verdun Windows and Doors
Area: Ottawa and Gatineau · Rating: 9.7 on HomeStars (500+ reviews) · Since: 1982
Verdun has won HomeStars' "Best of" award multiple times, including the Best of the Best Award in 2025, which only goes to businesses that have won three years running. The company manufactures many of its window lines at its own Vars, Ontario plant. Reviews highlight professional, timely installation and good communication, though a smaller number of customers have flagged installation quality or communication problems.
3. KORAL Windows and Doors
Area: Ottawa · Rating: 4.8 on Google (85+ reviews), 5/5 on HomeStars
KORAL is a smaller, owner-focused shop with roughly 15 years in the Ottawa market, and it shows in the personalized service reviewers describe. Customers repeatedly mention punctual quoting, competitive pricing against bigger competitors, and meticulous installers. The company backs jobs with a 25-year warranty covering frames, sashes, glass, hardware, paint and installation.
4. Clera Windows + Doors
Area: Ottawa, with locations at Southgate Road and Bentley Avenue · Rating: 3.9 on Birdeye (57 reviews, Ottawa South location) · Since: 1978
Clera is one of the longest-running vinyl window manufacturers in Ontario, with more than 45 sales and installation offices across the province and its head office and factory in Concord. Reviews are mixed: some customers praise a low-pressure sales process and strong workmanship, while others report warping products or weak after-sales follow-up. Worth budgeting extra time to check recent local reviews before booking.
5. Canadian Choice Windows & Doors
Area: Ottawa · Since: 1997
Canadian Choice has completed over a million installations across Canada and offers a 25-year transferable warranty on Canadian-made vinyl windows and entry doors. Customers frequently mention knowledgeable sales staff and respectful, detail-oriented installation crews. As a larger national operator, service consistency has drawn more complaints than some of the smaller Ottawa-only shops, so it is worth clarifying installer assignment and warranty handling up front.
6. CANA Windows and Doors
Area: Ottawa · Rating: 4.7 on Houzz, 4.9-star reviews cited by the company · Since: 1984 (BBB accredited)
CANA was Ottawa's first registered dealer of Energy Star qualified windows and has held an A+ Better Business Bureau rating since 1984. Reviewers point to professional, friendly installers who leave a clean site, along with pricing that came in below competing quotes for several customers.
7. Advanced View Windows & Doors
Area: Kanata, Stittsville, Barrhaven, Nepean, Manotick, Greely, Orleans and Rockland · Since: 1981
Advanced View is a family-owned business that has served the west and south ends of the Ottawa region for decades. Reviews consistently mention courteous, professional staff, quotes with no hidden fees, and installation timelines that hold up without cutting corners on quality.
8. Ottawa Windows & Doors
Area: Ottawa, Arnprior, Carleton Place, Dunrobin, Embrun, Kanata, Kemptville, Mississippi Mills and Manotick · Since: roughly 1996 (about 30 years in business)
Ottawa Windows & Doors manufactures through the Verdun Windows and Doors plant, giving it control over production end to end. Reviewers like that it is open Saturdays and appreciate staff who walk through glazing options in detail, plus fast turnaround from order to install. Some reviews describe unprofessional experiences, so it is worth reading recent feedback closely before committing.
9. Ecoline Windows
Area: Ottawa (Nepean office) and other Ontario and Alberta markets · Rating: 4.6 on Google (474 reviews)
Ecoline is a national installer with an Ottawa-specific office and a large volume of recent reviews to draw on. Customers frequently cite thorough cleanup, solid frames and noticeably better insulation after installation, along with consultants who explain options without pushing a sale.
10. Eco Ottawa Windows and Doors
Area: Ottawa · Rating: 4.9 stars, 87% of clients recommend (per company-cited review data)
Eco Ottawa is a smaller, owner-run operation where reviewers specifically credit owner Shane with fast responses and regular project updates. Customers describe efficient, well-managed installs and competitive pricing, and the company offers a lifetime guarantee on windows, doors and labour.
How We Built This List
This list was compiled from public web sources, including Google, HomeStars, Houzz, Birdeye and Better Business Bureau reviews, along with each company's own website. It is not a paid placement, and ottown has not tested, visited or independently verified any of these businesses' work. Ratings, review counts and founding years are included only where they appeared in a source read during research; details that could not be confirmed were left out. This list was last reviewed in August 2026, and businesses named here may change their pricing, service area or ownership over time, so confirm current details directly with each company.
Sources: HomeStars, Houzz, Google Business Profiles, Birdeye, Better Business Bureau, and each company's official website.
