A roof replacement is one of the most non-negotiable renovations Canadian homeowners face — and one where getting the estimate wrong is costly. Asphalt shingles remain the dominant choice at $8,000–$20,000 for a typical home, but the decision between 3-tab, architectural, and impact-resistant shingles affects both upfront cost and lifespan by 10–15 years. Metal roofing ($18,000–$40,000) and cedar shakes carry a premium that pays off over decades. Steep roof pitches add 15–30% to labour costs across all Canadian markets, making pitch one of the most underestimated cost variables.
This calculator generates a city-adjusted roofing estimate based on your roof's measured area (or approximate home footprint), pitch category, material choice, and project specifics. Configure the number of tear-off layers, decking replacement needs, chimney flashings, skylights, and optional ice and water shield upgrades. Each selection immediately updates your per-square-foot cost and project total — letting you compare the true long-run cost of asphalt versus metal for your specific roof dimensions.
If you are not sure of your roof area, multiply your home's footprint by 1.3 for a moderate pitch or 1.5 for a steep pitch — that approximates actual roof deck area. Get at least three quotes from licensed roofing contractors and ask each one to confirm the decking condition during tear-off: hidden rot adds $2–$5 per sq ft and is impossible to price before removal.