Home Extension Cost in Quebec 2026

Extending instead of moving is often the best financial option.

Price per square foot

• Simple ground floor: $200-250/sq ft
• With new foundation: $250-320/sq ft
• Upper floor addition: $280-350/sq ft
• Rear addition with basement: $300-400/sq ft

Extension vs moving

Moving costs in transaction fees: welcome tax, notary, broker commission, movers. On a $400,000 home, that's easily $25,000-35,000 just in fees.