Semi-detached homes define Toronto’s residential streetscape. Here’s the renovation guide specific to this housing type.
What makes semi-detached renovation different:
Party wall: The shared wall between the two semis is structural and legally shared. Any work near or affecting it — especially underpinning — requires a Party Wall Agreement with the neighbour and careful structural engineering.
Shared wall constraint: Two of four exterior walls are interior-adjacent. No windows, no doors, no ventilation on the shared wall. This constrains layout options and natural light penetration.
Typical proportions: Toronto semis range from 14–20 feet wide. This narrow footprint means renovation must be clever with space — especially in kitchens and bathrooms.
Most common semi-detached renovation projects:
- Full gut renovation: $200,000–$450,000
- Kitchen expansion (into dining room, with potential structural wall removal): $60,000–$120,000
- Master suite overhaul: $50,000–$100,000
- Basement income suite: $55,000–$85,000
- Rear addition (expanding into backyard): $120,000–$200,000
The neighbourhood context:
Semi-detached renovations that significantly outperform their street face resale challenges. The most successful renovations bring the home to the top of the range on that street — not beyond it.
What’s your semi-detached renovation experience? Share your neighbourhood, project, and outcome.
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