Princess-Rosethorn's 1950s and 1960s custom bungalows sit on some of the most generous lots in Etobicoke — making them ideally suited for rear additions and full second-storey expansions. Kopman Build has been building home additions in this premium enclave for over two decades, managing design, permits, and construction from a single point of accountability.
Princess-Rosethorn's deep lots and wide street setbacks create genuine opportunities for major additions — opportunities that require a contractor experienced in structural integration, premium finishes, and the specific approval processes that apply to Etobicoke properties. Kopman Build brings that experience to every project.
The neighbourhood's mid-century housing stock typically presents post-and-beam or block foundations that need careful assessment before any addition is designed. We engage structural engineers at the feasibility stage, not after drawings are complete, so your budget and schedule reflect reality from day one.
With land values in Princess-Rosethorn among the highest in Etobicoke, adding square footage through a well-executed home addition delivers exceptional return. Kopman Build's track record in this market means your project is handled by a firm that understands both the craft and the investment calculus.
Single-storey and multi-storey rear additions that extend your living space and integrate structurally with your existing bungalow.
Full second-storey additions on Princess-Rosethorn bungalows — double your living space while preserving the character of your lot.
Laneway suites where eligible, designed and built to City of Toronto guidelines — assessed against your specific lot and lane configuration.
Garden suites in rear yards under Toronto's as-of-right zoning, taking advantage of Princess-Rosethorn's exceptional lot depths.
Converting attached or detached garages into living space, a home office, or a rental unit — common in this neighbourhood's generous footprints.
Smaller targeted additions — mudrooms, sunrooms, bump-outs — designed to integrate cleanly with mid-century Etobicoke architecture.
We visit your Princess-Rosethorn 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 City of Toronto 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.
In Princess-Rosethorn, where lots are generous and homes command premium Etobicoke values, a single-storey rear addition typically runs $220,000–$420,000+ and a full second-storey addition on a 1950s or 1960s bungalow runs $350,000–$650,000+. Finish level, structural complexity, and lot conditions all affect the final number. Kopman Build provides a detailed line-item estimate before any commitment.
Many can, but it requires a structural assessment of the existing foundation, floor framing, and load-bearing walls. The post-war bungalows typical of Princess-Rosethorn were solidly built, but adding a full second storey almost always requires foundation reinforcement and new structural steel. Kopman Build engages a structural engineer at the outset of every second-storey project to confirm feasibility and scope.
Yes. All home additions in Etobicoke require a building permit from the City of Toronto. Depending on how close your addition comes to lot lines or how significantly it changes the building envelope, a Committee of Adjustment minor variance application may also be required. Kopman Build manages every permit and approval step, including any variance hearings.
Allow 4–8 months for permits and approvals, then 6–10 months for a rear addition and 9–14 months for a second-storey addition once construction begins. We build a full project schedule at the pre-construction stage so you know what to expect before any work starts.
Kopman Build builds home additions across Princess-Rosethorn and Etobicoke. No-obligation consultation — we come to your property.
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