Turn your roof's surface area into an illustrative low-to-high price range by material, plus one-time costs such as tear-off, disposal and permits.
Enter the roof surface area, not the house footprint. Measure the footprint including the overhangs, multiply it by the pitch factor for your slope (for example 1.118 for a 6/12 roof) and add a waste allowance; the roof measuring guide shows how. One roofing square is 100 sq ft, so 1,800 sq ft is 18 squares.
Formula: low = area × low price per sq ft + extras; high = area × high price per sq ft + extras.
Worked example (illustrative): 1,800 sq ft of architectural asphalt at $4.50–$7.50 per sq ft, plus $1,500 for a second layer tear-off and a disposal bin: low = 1,800 × $4.50 + $1,500 = $9,600; high = 1,800 × $7.50 + $1,500 = $15,000. Add GST/HST or GST plus PST/QST afterwards; see the sales tax guide.
Limits: the preset per-square-foot ranges are rough illustrations, not survey data or quotes. Steep pitches, three-storey walls, many valleys and dormers, chimneys, skylights, rotten decking and winter work all push real prices up, and city prices differ from rural ones. Replace the presets with the per-square figures on your written quotes.
Worked Estimates and Checklists
A line-by-line illustrative quote for re-roofing a Canadian two-storey house in asphalt shingles, with decking, ventilation, HST or GST/QST, deposit and holdback.
Costs, Price Factors and 2026 Rules
How flat and low-slope roofs on Canadian homes, plexes and additions are priced, membrane types compared, insulation and drains, and Montreal reflectance rules.
Costs, Price Factors and 2026 Rules
Which sales taxes apply to roofing and siding contracts in each province, how to check a contractor's GST/HST number, cash-deal risks and worked tax examples.
Failures, Disputes and Official Sources
When Canadian home insurance covers roof and siding damage from hail or wind, why wear and tear is excluded, depreciation and roof age, deductibles and how to dispute a refusal.
Worked Estimates and Checklists
Measure a roof from the ground or plans, convert footprint to sloped area with the pitch factor, add waste and count roofing squares and shingle bundles.
Costs, Price Factors and 2026 Rules
Why steeper roofs cost more in Canada, how to convert footprint to roof area with a pitch factor, steep-roof labour charges and the slope limits for shingles.
