Roof Replacement Cost Calculator

Build a roof replacement budget from measured roof area and the rates you want to test.

Roof replacement visual guide comparing damaged shingles and flashing with a clean, professionally finished asphalt shingle roof. — **Roof Replacement: red flags vs better practice.** Use this as a homeowner screening guide before comparing project scope and contractor quotes. It is not a substitute for inspection, manufacturer instructions, permitting requirements or local codes.

Why this affects cost: visible condition, access, preparation, removal work and installation quality can change labor and material requirements. Use the calculator or guide on this page with local quotes whenever possible.

Transparent by design: every rate is editable. Use local quotes or supplier prices when available.

WCL / INTERACTIVE MODEL

Roof area (sq ft)Waste / complexity allowance (%)New roof installed rate ($/sq ft)Tear-off / disposal rate ($/sq ft)Fixed permits / flashing / extras ($)Contingency (%)

Why roof area differs from floor area

Pitch, overhangs and geometry can make roof surface area materially different from floor area. Use measured roof area when possible.

Solar at the same time

If solar is being considered, see Solar Panel Installation Cost.

Have contractor quotes?

Compare scope, exclusions, permits and warranty side by side.

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External video

Watch: practical renovation guide

A short external video can help you understand the installation details behind the cost drivers on this page.

How to Install Roof ShinglesThis Old HouseWatch on YouTube ↗

Roof Replacement Cost Calculator

Why roof area differs from floor area

Solar at the same time

Have contractor quotes?

Watch: practical renovation guide

Continue planning with WattCostLab

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