Best home additions & second storeys builders in Toronto
These six firms treat home additions and second-storey builds as core work, not a side offer, and each is scored using our methodology, which weighs review volume, rating, recency, and sentiment together.
Looking for a generalist instead? See our best renovation contractor overall list. The order here reflects how each firm performs specifically on addition and second-storey projects, not renovations broadly.
Picks are ranked by score and relevance to home additions & second storeys, so a lower overall score can rank higher here.
At a glance
| # | Business | Score | Rating | From | Best for |
|---|---|---|---|---|---|
| 1 | Kristal Renovations | 89 | 5 (54) | — | Whole-home additions done end to end |
| 2 | Struco Homes and Renovations | 81 | 5 (23) | — | Additions on older Toronto homes |
| 3 | Bay Design Build | Kitchen & Home Renovation Toronto | 85 | 5 (21) | — | Design-led additions with 3D previews |
| 4 | 👷 Mr General Contractor & Renovations Toronto | 78 | 4.7 (87) | — | Broad trade referrals, if you vet closely |
| 5 | BUILD IT | 78 | 5 (21) | — | Structured project management on tight timelines |
| 6 | Billdr Renovation | 57 | 3.9 (12) | — | Early scoping, permits, and cost breakdowns |
1. Kristal Renovations
5 (54 reviews)score 89/100
Kristal holds a perfect five-star record across 54 reviews, with no complaints on file. Reviewers describe accurate estimates, no surprise fees, and detail-focused finishing work spanning basements to kitchens, which matters on additions where scope tends to creep.
- Perfect five-star record across 54 reviews
- Accurate estimates with no hidden costs
- Skilled, professional subcontractors on site
- Strong attention to detail in finish carpentry
Google-verified54 Google reviews25+ Years
Services: bathroom renovation, kitchen renovation, basement renovation, whole home renovation
2. Struco Homes and Renovations
5 (23 reviews)score 81/100
Struco's Houman and Ron personally run projects and have a track record of solving structural surprises in century-old homes without derailing the schedule. All 23 reviews are five-star, though that's a smaller sample than the top pick, so treat it as a strong but slightly less proven record.
- Owners personally manage projects and site issues
- Zero one- or two-star reviews among 23 clients
- In-house multi-trade capability (framing, waterproofing, tile, drywall)
- On-time, on-budget even when older homes reveal surprises
Google-verified23 Google reviewsSince 2006
Services: kitchen renovation, home additions, basement renovation, whole home renovation
3. Bay Design Build | Kitchen & Home Renovation Toronto
5 (21 reviews)score 85/100
Bay Design Build leans on free 3D design consultations up front, which helps homeowners see an addition before committing. Saeed and Sahar are named as the client contacts, and reviewers describe adapting design mid-build without scope creep or hidden charges.
- Free 3D design and consultation before you commit
- Named project leads handle communication directly
- Flexible design changes during construction
- Transparent pricing with no hidden costs
Google-verified21 Google reviews
Services: bathroom renovation, kitchen renovation, custom carpentry finishing, basement renovation
4. 👷 Mr General Contractor & Renovations Toronto
4.7 (87 reviews)score 78/100
Mr General Contractor answers calls outside normal hours and covers a wide range of trades through its referral network, which recent reviewers praise. But a documented 2025 complaint describes poorly vetted subcontractors, costly redo work across drywall, framing, tiling and siding, and unpaid subs contacting the homeowner directly, so this one needs a closer look before signing anything.
- Responsive outside normal business hours
- Covers a broad range of trades through referrals
- Recent reviewers note professionalism and punctuality
Watch out: A 2025 review details serious execution problems, including unvetted subcontractors and costly redo work; get everything in writing and check references.
Google-verified87 Google reviewsover 20 years
Services: bathroom renovation, kitchen renovation, emergency repair, home additions
5. BUILD IT
5 (21 reviews)score 78/100
BUILD IT holds a clean five-star record across 21 reviews, with reviewers pointing to on-time delivery and responsive staff. Its track record leans more toward commercial fit-outs and restaurant builds than residential additions, and the review count is still modest, so ask directly about second-storey experience specifically.
- Consistent on-time delivery across projects
- Full-service general contracting team
- Detail-oriented and responsive communication
- Named, experienced project staff
Watch out: Most of the praise on record centers on commercial and restaurant work rather than residential additions.
Google-verified21 Google reviewssince 2008
Services: kitchen renovation, interior construction contractor, custom home builder, flooring contractor
6. Billdr Renovation
3.9 (12 reviews)score 57/100
Billdr's project managers, Megan, Raphael and Marco get credit for walking homeowners through scoping, permitting, and clear cost breakdowns before a shovel goes in the ground. That said, the overall rating sits at 3.9 from just 12 reviews, and one-star feedback from both contractors and homeowners points to staff turnover and follow-through problems once work actually starts.
- Detailed, transparent cost breakdowns up front
- Experienced project managers during planning
- Access to a wider contractor referral network
Watch out: One-star reviews cite staff turnover, inconsistent contractor vetting, and billing issues once construction begins.
Google-verified12 Google reviews
Services: bathroom renovation, basement renovation, whole home renovation, drainage service
How this ranking was calculated
| Signal | Weight |
|---|---|
| Review sentiment | 28% |
| Google rating | 26% |
| Review volume | 20% |
| Profile completeness | 16% |
| Review recency | 10% |
Ranking data checked 2026-09-08 · Full methodology ›