Roof Replacement Cost Calculator

Use the horizontal projected roof area, including overhangs. For pitch p:12, multiply that footprint by sqrt(1+(p/12)^2). Central Oregon Community College’s undated technical mathematics text explains the roof geometry. Living-floor area is not a roof footprint; sum separate facets when pitches differ. Central Oregon Community College: Technical Mathematics for Today’s World (year not stated; checked 2026).

GAF’s August 2026 guide defines a roofing square as 100 square feet of roof area and suggests 10–15% shingle waste/trim allowance. There is no sourced typical midpoint or metal/tile waste allowance here. Waste affects shingle purchase quantities and is not automatically applied to installed-area bid rates. GAF: How Many Bundles of Shingles Are in a Square? (24 August 2026).

SHRA’s historical public bid observations have no printed price year: $550 per square for areas at least 501 square feet, or $595 per square for 1–500 square feet. These are size tiers, not market percentiles. Shingles and standard roof accessories are included; tear-off is separate. Current local prices and statistical typical: get a local quote. Sacramento Housing and Redevelopment Agency: bid 1976-DSdd (price year not printed).

SHRA’s historical public bid observations, price year not printed, list asphalt tear-off/disposal at $125 per square for one layer, $165 for two layers and $200 for three layers. Apply only the corresponding layer count. Heber Springs’ 2025 metal removal bid endpoints are $222–$500 per square, with no sourced layer multiplier. Sacramento Housing and Redevelopment Agency: bid 1976-DSdd (price year not printed). City of Heber Springs: bid 25-002 (24 June 2025).

Heber Springs’ 2025 standing-seam installation bid endpoints are $520–$2,100 per square, excluding separately priced ridge, trim, flashing, gutters and removal. The original bid tabulation was directly verified on 4 October 2026: two nonwithdrawn bidders, Community Center items 1–2 on page 1. No usable public installed tile coefficients were verified. Typical, current local prices and unsupported extras: get a local quote. City of Heber Springs: bid 25-002 (24 June 2025).