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Flat roof replacement cost per square foot
Rising related search: choose membrane type, tear-off, access, and market — then enter flat roof area.
Last updated: August 2026
Cost calculator
Tap each row. Use the ? if a term is unclear — some words are contractor jargon.
Modified bitumen · Recover / overlay (if allowed) · Easy ground access · Lower-cost area
$4.20–$8.80 per sq ft installed
$5,040 – $10,560.00U.S. ballpark for the filters above — get local bids to confirm“Flat roof replacement cost per square foot” is rising alongside broader roof cost searches. Low-slope roofs are a different trade than steep asphalt: membranes, insulation, drains, and flashing details drive the number.
What homeowners usually mean by flat
Most “flat” residential roofs are low-slope — they still drain, but not like a shingle gable. Garages, additions, modern homes, and small commercial spaces often use TPO, EPDM, PVC, or modified bitumen.
- Recover can look cheaper until code or manufacturer rules require tear-off.
- Wet or failing insulation is a common surprise after tear-off.
- Parapet walls, HVAC curbs, and drains are frequent change-order sources.
Filter the membrane, tear-off depth, and access, then scale by area. For steep asphalt houses, switch to the asphalt roof replacement calculator.