Casa Loma's early 20th century homes on hillside ravine lots along the Spadina corridor hold enormous untapped potential — a full second storey addition can double your living space without leaving one of Toronto's most distinctive neighbourhoods. Kopman Build has been navigating the structural complexity and permit approvals that come with these character homes since 1999.
Casa Loma's housing stock presents a particular set of challenges for second storey additions. The neighbourhood's early 20th century construction — often balloon-frame or heavy-timber — requires careful structural assessment before adding a second level. Hillside ravine lots introduce dramatic grade changes that affect equipment access, foundation conditions, and the load path of any new structure above. Kopman Build has worked extensively on homes like these and knows where the risk lives before the first wall opens.
Ravine proximity along the Spadina corridor also means many properties fall within the City's Ravine and Natural Feature Protection bylaw and may require TRCA review alongside a standard building permit. Properties within heritage overlay areas face additional design approval requirements. We identify every applicable approval at the outset — nothing is discovered mid-construction.
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 Casa Loma project is managed by someone who understands the craft — not just the schedule.
Full review of the existing structure's capacity to carry a second storey — critical on early 20th century Casa Loma homes before any design is finalized.
Complete second-floor additions that double the footprint — bedrooms, bathrooms, and primary suites designed to match the existing architectural character.
Targeted second-storey additions over a portion of the existing footprint — common on Casa Loma's one-and-a-half storey bungalows and cape cod forms.
Managing all Ravine and Natural Feature Protection permits and TRCA submissions for properties adjacent to Casa Loma's ravine system.
Design coordination to satisfy heritage overlay requirements where applicable along the Spadina corridor and surrounding streets.
Combining a second storey addition with main floor renovation — a single mobilization that transforms the whole home, common in Casa Loma's active full-renovation market.
We visit your Casa Loma property, assess the site conditions and existing structure, 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 — including structural and approval costs specific to your lot.
We manage all permit applications, TRCA submissions, heritage reviews, and engineering consultants — nothing falls through the cracks.
Full-time site supervision, weekly updates, and open-book cost tracking throughout the project. Careful sequencing to protect the existing structure during the addition.
Structured handover with all documentation, warranties, and a 12-month attendance window post-completion.
A second storey addition on a Casa Loma home typically runs $350,000–$650,000+ depending on the footprint, existing structure condition, and finish level. Casa Loma's hillside ravine lots and early 20th century construction can introduce structural complexity that affects cost. Kopman Build provides a detailed pre-construction estimate before any commitment.
Yes. All second storey additions in Toronto require a building permit. In Casa Loma, ravine proximity may trigger a Ravine and Natural Feature Protection (RNFP) permit and a Toronto and Region Conservation Authority (TRCA) review. Some properties along the Spadina corridor fall within heritage overlay areas that require additional design approval. Kopman Build identifies and manages all applicable approvals upfront.
Dramatic grade changes on Casa Loma's ravine lots affect access for equipment and materials, foundation assessment requirements, and occasionally the structural load path when adding a second storey. We conduct a thorough structural and site review at the outset, so there are no surprises once construction begins.
Most second storey additions in Casa Loma take 8–14 months from permit approval to completion. Permitting and any required TRCA or heritage approvals can add 4–9 months before construction begins. We provide a realistic full timeline at the consultation stage so you can plan around it.
Kopman Build builds second storey additions across Toronto and the GTA. No-obligation consultation — we come to your property.
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