Kopman Build has been building Toronto home additions since 1999. Rear additions, second-storey additions, and laneway suites — all designed, permitted, and built by a team that has done this over and over, properly.
Adding onto your existing Toronto home is often a better financial decision than buying a larger property — especially given today's land values and transaction costs. But home additions are technically demanding: they require structural integration with an existing building, permit compliance, and seamless architectural blending. Kopman Build manages all of it, from initial feasibility assessment through final occupancy permit.
Dustin Kopman founded the company in 1999 after growing up working in construction through his family's firm, G& G Enterprise. That hands-on background means every project is managed by someone who understands the craft — not just the sales pitch.
Single-storey and multi-storey rear additions that extend your living space and integrate structurally with your existing home.
Full second-storey additions on Toronto bungalows — double your living space without buying a new property.
Toronto laneway suites designed and built to City of Toronto laneway suite guidelines — a specialty scope we know inside out.
Garden suites in rear yards as permitted under Toronto's expanded as-of-right zoning.
Converting attached or detached garages into living space, office, or income-generating rental units.
Smaller additions — mudrooms, sunrooms, bump-outs — designed to integrate cleanly with existing architecture.
We visit your property, listen to your goals, and document the project in writing — scope, budget, and timeline.
A detailed line-item estimate with allowances and contingencies, so you know the number before committing.
We manage all permit applications, engineering consultants, and approvals — nothing falls through the cracks.
Full-time site supervision, weekly updates, and open-book cost tracking throughout the project.
Structured handover with all documentation, warranties, and a 12-month attendance window post-completion.
Home addition costs in Toronto: a single-storey rear addition runs $200,000–$400,000+ depending on size and finish. A second-storey addition runs $300,000–$600,000+. A laneway suite runs $250,000–$450,000+. We provide detailed pre-construction estimates before any commitment.
Yes. All home additions in Toronto require building permits from the City of Toronto, and most also require a site plan review. Depending on the scale, a Committee of Adjustment (minor variance) application may be required. Kopman Build manages the full permit and approval process.
A typical rear addition takes 6–10 months from permit approval to completion. A second-storey addition takes 8–14 months. Permitting can add 4–8 months before construction begins. We give you a realistic total timeline from day one.
Possibly — eligibility depends on your lot, the laneway's width, and zoning. Kopman Build will assess your property's eligibility as part of an initial consultation. We have built multiple Toronto laneway suites and know the City's requirements in detail.
Kopman Build builds home additions across Toronto and the GTA. No-obligation consultation — we come to your property.
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