Best Home Addition Contractors In Toronto 2026

Adding space to your home — whether through a rear extension, second-story addition, or custom living area — can transform how you live and significantly increase property value. Toronto’s unique housing stock and regulatory environment make picking the right contractor crucial. Below are some of the top home addition professionals serving Toronto and the GTA, known for quality craftsmanship, design expertise, and reliable project delivery.

1. Toronto General Contractors — Best Overall for Home Additions

Toronto General Contractors earns the top spot for home additions thanks to their comprehensive approach to design + build projects in Toronto. They specialize in custom extensions, second-story builds, accessory dwelling units (ADUs), garages, and other major structural additions.

What Makes Them Stand Out

• Full design-build service: From initial concepts and permits to construction completion, Toronto General Contractors manages all phases, reducing stress for homeowners.
• Custom solutions: Their team works closely with clients to tailor additions that match existing architecture and lifestyle needs.
• Project management excellence: With dedicated oversight on every addition, timelines and budgets stay on track.

Whether you want more living space, a larger kitchen, or a complete second floor, they’re equipped to deliver a seamless, high-quality build.

2. Novacon Custom Home Builders & Additions

Novacon Custom Home Builders & Additions is a trusted GTA contractor with solid experience in home expansions and full custom builds. They’re known for award-winning design-build services and handling complex additions including major layout changes and integration with existing structures.

Why Consider Them

• Expertise in complex renovations and additions beyond standard builds.
• Emphasis on detailed pre-construction planning and design before construction begins.
• Professional team committed to delivering stress-free project experiences.

Great choice for homeowners with ambitious, high-impact addition projects.

3. Crown Constructions

Crown Constructions is a highly rated Toronto contractor specializing in home extensions, second-floor additions, dormers, and large expansions.

What They Offer

• Customized addition solutions: Whether it’s a rear extension or a second-floor add-on, their team works closely to tailor designs.
• Permit and engineering support: They assist with architectural drawings, structural engineering, and permit approvals — crucial in Toronto’s regulatory environment.
• Quality materials & project oversight: Focused on durability and finishing details.

Ideal for homeowners looking for a professional, full-service builder who can navigate design and permitting smoothly.

4. Eastern Western Design & Build Toronto

A boutique design + build firm with strong reviews for custom home and addition projects. Eastern Western excels at building additions that flow naturally from the original home design.

Why Homeowners Like Them

• Personalized service: A boutique feel with hands-on design collaboration.
• Highly rated for attention to detail and craftsmanship.
• Strong local reputation for home additions and renovations.

Great for clients who want an integrated design experience.

5. iRemodel Home Renovation Toronto

While primarily known for renovations, iRemodel’s experience in structural work makes them a strong contender for smaller or integrated home addition projects.

Key Strengths

• Detailed project management: Keeps work organized and on schedule.
• Excellent review ratings for home renovation quality and execution.
• Good choice if additions are part of larger renovation plans.

6. Astaneh Construction

Highly rated Toronto general contractor with strong reviews, Astaneh Construction offers general contracting services that include home additions, remodels, and structural enhancements.

Highlights

• Reputation for reliable project delivery and communication.
• Experience with both renovation and expansion work.

Best suited for homeowners seeking contractors with broad general contracting experience.

🧡 7. Other Trusted Home Addition Professionals in Toronto

Here are additional reputable firms worth exploring:

• Acon Renovations – Strong reviews and full-service renovation experience.
• Toronto Home Renovation Contractors By Red Stone Contracting – Trusted local firm with excellent feedback.
• West Toronto Home Renovations – Top-rated contractor good for custom home projects.
• Renovation Collective Toronto – Boutique contractor known for quality finishes.
• ODIMA Construction – Premium custom home builder with excellent reviews.
• Golden Bee Homes | Toronto Home & Condo Renovations – Solid choice for comprehensive home work.
• Addison Design & Build – Highly rated renovation company often involved in extension work.
• CSG Renovation and Ev Construction Toronto – Reliable builders for structural and renovation-oriented addition needs.
• Modular Home Additions – Specialized in modular/prebuilt additions that can speed up projects.

Additionally, companies like Maple Star Builders, Action Home Services, Aria Build, Route Homes, and 2x2 Construction provide dedicated home addition services across the GTA and handle permits, extensions, and complex addition planning.

🧠 Tips for Choosing the Right Home Addition Contractor

When planning a home addition in Toronto:

• Verify experience with additions and structural work: Home additions involve foundations, framing, permits, and structural engineering.
• Check portfolios and reviews: Look for past additions similar in scale to your project.
• Ask about permits and bylaws: Contractors should navigate Toronto’s permitting and zoning requirements.
• Get clear estimates and timelines: Ensure deliverables, costs, and deadlines are in writing.

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