Best garage additions & conversions builders in Ottawa
Looking for the wider field of add-on and structural builders in the city, including firms that don't specialize in garages specifically? See best garage builders overall.
Picks are ranked by score and relevance to garage additions & conversions, so a lower overall score can rank higher here.
At a glance
| # | Business | Score | Rating | From | Best for |
|---|---|---|---|---|---|
| 1 | Magnolia Design & Build | 89 | 4.8 (125) | — | Complex structural additions |
| 2 | Capital Homes | 86 | 4.9 (112) | — | On-budget renovations with hands-on PMs |
| 3 | Ottawa General Contractors | 76 | 4.4 (233) | — | Large-scale projects needing coordination |
| 4 | Holland Homes & Renovations Inc. | 71 | 5 (16) | — | Old-home additions with design input |
| 5 | Ottawa Home Pros | 56 | 4.1 (8) | — | Small, fast-turnaround jobs |
1. Magnolia Design & Build
4.8 (125 reviews)score 89/100
Magnolia's reviews describe a team that handles the hard cases, from basements cut out of bedrock to full-scope additions, without losing track of budget or timeline. Owner Joey answers calls personally even on weekends, and the same named crew members show up across projects year after year, which points to a stable operation rather than a rotating cast of subs.
- Owner personally responsive, including weekends
- Stays within quoted budget even on complex jobs
- Same named crew across multiple projects
- Experience with tough site conditions like bedrock excavation
Watch out: One project ran about two weeks past schedule, though reviewers said the finished result justified the wait.
Services: detached garage construction, garage additions conversions, custom finishes heated garages
2. Capital Homes
4.9 (112 reviews)score 86/100
Capital Homes pairs strong ratings with named project managers, Conor, Ammar, and Moe, who clients credit for transparent estimates and staying on the numbers they quoted. The firm's background in rental property and larger home renovations carries over into consistent finish quality, and they follow up with clients well after handoff.
- Transparent, no-surprise cost estimates
- Project managers stay visible through the whole job
- Clean worksites and careful treatment of existing fixtures
- Follow-up support months after completion
Watch out: A few projects ran longer than the initial estimate, sometimes due to supplier delays outside their control.
Services: detached garage construction, garage additions conversions
3. Ottawa General Contractors
4.4 (233 reviews)score 76/100
Ottawa General Contractors has the largest review base here, and the top-end reviews are strong: named project managers Murad, George, Roger, and Adam get credit for daily photo updates and getting multi-trade jobs done on or ahead of schedule. That said, the record is split, with a real cluster of complaints about unfinished work and surprise invoices.
- Daily photo and portal updates during the build
- Coordinates multiple trades on larger projects
- On-schedule or early completion on praised jobs
- Warranty coverage with responsive repair follow-up
Watch out: Multiple one-star reviews describe unfinished work, surprise charges, and a practice of tying compensation credits to NDAs, so get contract terms locked down before signing.
Services: detached garage construction, garage additions conversions, custom finishes heated garages, garage permits design
4. Holland Homes & Renovations Inc.
5 (16 reviews)score 71/100
Holland Homes has a perfect rating from 16 reviews, with owner Robert and project manager Scott named repeatedly for design guidance and honoring budgets on additions to older Ottawa homes. Reviewers point to their comfort handling the structural surprises that century-old houses tend to throw at a project. The review count is smaller than the names above it, so treat this as a promising but lower-confidence pick.
- Owner and PM known by name across reviews
- Design process adapts to client lifestyle and budget
- Track record on century-old homes and structural surprises
- Consistent on-time, on-budget delivery in reviews
Watch out: Only 16 reviews on record, and the most recent activity is thinner than the other names on this list.
Services: carriage house laneway garage, detached garage construction, garage additions conversions
5. Ottawa Home Pros
4.1 (8 reviews)score 56/100
Ottawa Home Pros gets praise for clean, quick execution on the projects that went well, with reviewers calling out easy project navigation. The review base is small and mixed, with older complaints about slow starts and imprecise finish work sitting alongside the positive ones, so this is more of a budget-confidence pick than a sure thing.
- Clean, fast execution on well-reviewed projects
- Smooth day-to-day project navigation
Watch out: Only 8 reviews total, with older ones citing slow communication and inconsistent finish quality.
Services: detached garage construction, garage additions conversions