Exterior view of a two-storey Ontario home with a 1,000 sq ft addition seamlessly integrated into the original structure
Home Renovation

1000 Sq Ft Addition Cost Ontario: Real 2026 Prices

Home Renovation /

A 1000 sq ft addition cost in Ontario runs $300,000 to $550,000 in 2026, or roughly $300 to $550 per square foot. Second storey additions land at the higher end of that range, while single-storey rear additions trend lower.