Flat roof replacement: TPO cost, lifespan, and options
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Short answer: TPO typically costs $4 to $14 per square foot installed, and a 1,500 sq ft roof averages about $10,700.[1] Removing the old flat roof adds about $1 to $5 per square foot.[2] InterNACHI estimates TPO lasts 7 to 20 years, modified bitumen about 20, and EPDM 15 to 25.[3]
How much does a TPO flat roof cost?
Angi lists TPO at $4 to $14 per sq ft installed. A typical 1,500 sq ft TPO roof averages about $10,700, with a range of $6,500 to $24,000.[1] Removing the old flat roof adds about $1 to $5 per sq ft, and labor runs about $3 to $7 per sq ft.[2]
How long does a flat roof last?
InterNACHI estimates 7 to 20 years for TPO, about 20 for modified bitumen, 15 to 25 for EPDM, and about 30 for built-up roofing. In Florida, all of these are shorter.[3][4]
Which flat-roof membrane should you choose?
- TPO: a white, reflective, heat-welded seam membrane. Popular for cooling in hot climates.
- Modified bitumen: asphalt-based, tough, and common on homes.
- EPDM: black rubber. Very common in colder climates.
- Spray foam (SPF): common in Arizona and needs periodic recoating.[5]
Chicago bungalows, Milwaukee additions, and Phoenix ranch homes often have low-slope sections. Choose "Flat / low-slope" in the estimator.
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Frequently asked questions
How much does a TPO roof cost?
Angi reports $4 to $14 per sq ft installed, with about $10,700 average for a 1,500 sq ft roof.
How long does a TPO roof last?
InterNACHI estimates 7 to 20 years, depending on product quality, installation, and climate.
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Sources
- Angi, TPO Roofing Cost. www.angi.com/articles/tpo-roofing-cost.htm
- Angi, Flat Roof Replacement Cost. www.angi.com/articles/how-much-does-flat-roof-replacement-cost.htm
- InterNACHI, Standard Estimated Life Expectancy Chart. www.nachi.org/life-expectancy.htm
- InterNACHI, Estimated Life Expectancy Chart for Florida Homes. www.nachi.org/florida-life-expectancy.htm
- Capstone Roofing AZ, Foam roof maintenance in Arizona. capstoneroofingaz.com/foam-roof-maintenance-in-arizona/
Sources checked November 4, 2026. Estimates are not quotes. Roofing, insurance, and legal details vary. Confirm with your contractor, insurer, or attorney.