Rosedale’s grand 1890s–1930s homes — many set on ravine lots along Toronto’s most prestigious streets — contain lower levels ready for transformation when handled with the right expertise. Kopman Build brings 25 years of Toronto basement experience to Rosedale, delivering high-end finished spaces, legal secondary suites, and heritage-sensitive renovations that match the calibre these homes demand.
Rosedale’s century-old housing stock presents challenges that most contractors are not equipped to handle. Foundations from the 1890s and 1920s often require underpinning to achieve modern ceiling heights. Ravine-adjacent properties carry additional permit requirements under the City of Toronto’s Ravine and Natural Feature Protection bylaw. And in a neighbourhood where property values routinely exceed $4 million, finishes and craftsmanship must meet a corresponding standard — there is no room for shortcuts.
Kopman Build has worked in Rosedale’s older homes long enough to understand what these projects actually require: when a geotechnical report is needed before excavation, how to coordinate with Heritage Preservation Services when a new exterior access point is part of scope, and how to source materials and trades that belong in a home at this level. Every basement we finish is permitted, inspected, and signed off — no exceptions.
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.
Full secondary suite creation compliant with Toronto zoning, Ontario Building Code, and City of Toronto Second Suite requirements — sized for Rosedale’s generous footprints.
Finished basement family rooms, home theatres, wine cellars, and entertainment spaces built to the high-end standard Rosedale homes require.
Dedicated basement home offices and creative studios with appropriate egress, lighting, and electrical for modern professional use.
New basement washrooms and ensuites, including rough-in plumbing, premium tiling, and fixture installation to match the home’s character.
Basement underpinning and bench-pinning to achieve livable ceiling heights in Rosedale’s 1890s–1930s foundations — properly engineered and permitted.
Interior and exterior waterproofing, sump pits, weeping tile, and drainage solutions appropriate for Rosedale’s ravine-adjacent and hillside lots.
We visit your Rosedale 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 and geotechnical consultants, ravine approvals, and City sign-offs — 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.
Basement renovations in Rosedale typically start at $90,000–$150,000 for a high-end finished space, reflecting the neighbourhood’s standard for materials and craftsmanship. Legal secondary suites in Rosedale’s larger homes can run $120,000–$200,000+, particularly where underpinning is required to achieve adequate ceiling height in 1890s–1930s-era foundations. We provide full line-item estimates before any commitment.
While heritage designation in Rosedale primarily governs exterior alterations, basement work in older homes can uncover registered heritage fabric that requires careful handling. Any structural modifications — including underpinning or new rear entrances — must be reviewed under City of Toronto building permit requirements. Kopman Build has experience navigating heritage-adjacent projects and coordinates with the City’s Heritage Preservation Services when required.
Rosedale’s ravine-adjacent properties fall under the City of Toronto Ravine and Natural Feature Protection bylaw. Excavation or grading near the ravine setback requires a Ravine Protection Permit in addition to the standard building permit. Kopman Build manages all permit applications, geotechnical reviews, and conservation authority approvals required for basement work on ravine lots.
Yes. Rosedale’s large 1890s–1930s homes often have substantial basement footprints well-suited to secondary suite conversion. Requirements include minimum ceiling height (typically 1.95m — achievable through underpinning in many older homes), egress windows, fire-rated separation, separate mechanical, and an accessible entrance. Kopman Build manages the full process: design, permits, construction, and final inspections.
Kopman Build delivers permitted, high-calibre basement renovations in Rosedale and across Toronto. No-obligation consultation.
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