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Flat Roof (EPDM / TPO / Built-Up) Cost and Buying Guide (2026)
Best for: Flat or low-slope roofs, modern and commercial-style homes. Below is what it costs installed, how long it lasts, where to buy it at every price point, and how the quality compares.
Where to buy: low, medium and high priced
| Price level | What to get and where |
|---|---|
| Low | EPDM rubber membrane |
| Medium | TPO membrane |
| High | Modified bitumen / built-up systems |
Tip: roofing distributors such as ABC Supply, Beacon and SRS (and RONA or Roofmart in Canada) often sell clearance and overstock 40% to 60% below retail if you call and ask. Big-box clearance tags and Facebook Marketplace contractor lots are other cheap sources.
Quality and brands
EPDM (budget), TPO (mid, energy efficient), modified bitumen (premium)
Pros and cons
| Pros | Good for flat roofs, TPO reflects heat |
| Cons | Shorter life, ponding water risk, not for steep roofs |
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