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 (126) | — | Complex structural additions |
| 2 | Ottawa General Contractors | 75 | 4.4 (240) | — | Large-scale projects needing coordination |
| 3 | Holland Homes & Renovations Inc. | 70 | 5 (16) | — | Old-home additions with design input |
1. Magnolia Design & Build
4.8 (126 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
Services: detached garage construction, garage additions conversions, custom finishes heated garages
2. Ottawa General Contractors
4.4 (240 reviews)score 75/100
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
Services: detached garage construction, garage additions conversions, garage permits design, custom finishes heated garages
3. Holland Homes & Renovations Inc.
5 (16 reviews)score 70/100
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
Services: carriage house laneway garage, detached garage construction, garage additions conversions
How these rankings are worked out
| Signal | Weight |
|---|---|
| Review sentiment | 28% |
| Google rating | 26% |
| Review volume | 20% |
| Profile completeness | 16% |
| Review recency | 10% |
Ranking data checked 2026-09-16 · Full methodology ›