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Flat roof cost calculator (2026)

Estimate a flat or low-slope roof by area and membrane — TPO, EPDM, PVC, or built-up.

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This calculator estimates a 2026 flat or low-slope roof by your roof area and membrane type. Flat roofs are common on additions, garages, and commercial buildings.

Estimated installed cost
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Flat roofs need proper slope and drainage — a pro sets these to prevent ponding.

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Flat roof cost by membrane

EPDM is the low-cost rubber option; TPO is white and reflects heat; PVC is premium and chemical-resistant; built-up is the traditional tar-and-gravel system. See flat roof cost and our TPO vs. EPDM comparison.

Cost ranges reflect 2026 U.S. installed prices (BLS producer/labor data, Remodeling Cost vs. Value, and manufacturer pricing). Your real price depends on your roof, region, and pro — see the full cost guide.

FAQ

Flat Roof Calculator questions

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A flat or low-slope roof runs about $4.50–$12 per sq ft installed. EPDM and TPO cost the least; PVC and built-up cost more.
TPO and EPDM are the most popular for homes — TPO reflects heat, EPDM is tough and cheap. PVC suits demanding or commercial roofs. A pro matches it to your building.
Usually the slope is too shallow or a drain is clogged. Even a "flat" roof needs a slight pitch. A vetted pro re-slopes and reseals it so water runs off.
A quality TPO or EPDM roof lasts 20–30 years with maintenance. Built-up roofs can last similar with regular re-coating.

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