ADU How Much Does It Cost to Build an ADU in Ontario?
There is no single ADU price in Ontario. Detached garden suites in the GTHA were reported at $200,000 to $350,000 (2025); converting existing space costs less.
ADU There is no single ADU price in Ontario. Detached garden suites in the GTHA were reported at $200,000 to $350,000 (2025); converting existing space costs less.
Renovation No single number. HomeStars reports Canada-wide kitchens at $16,402 to $45,618 (2026). Where you land turns on scope, condition, finish level, and surprises.
Custom Build No single figure. GTA custom hard construction runs hundreds per square foot, and Burlington government charges add roughly $89,000 or more before framing.