Your flat roof estimate
Estimates only, not quotes. Takes about a minute.
Flat and low-slope roofs cover Austin mid-century homes, additions, garages, and commercial-style modern builds. The system is different from pitched roofing: TPO membrane, modified bitumen, or built-up roofing, with drainage as the make-or-break detail.
Ponding water for more than 48 hours after rain is a failure in this climate.
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What flat roofs usually cost in Austin
| TPO membrane, 1,500 sq ft | $8,500 - $17,000 (Typical $12,500) |
| TPO, 2,500 sq ft / complex | $13,000 - $22,000 (Typical $17,500) |
| Modified bitumen | $8,000 - $16,500 (Typical $11,800) |
| Recoat / restoration coating (if eligible) | $3,500 - $9,000 (Typical $5,800) |
Based on published Austin cost data. Updated October 15, 2026.
What drives the price in Austin
- Ponding and Texas downpours: Austin rain arrives in bursts. A flat roof that drains in Houston drizzle can still pond here. Design for burst rain, not average rain.
- Sun load: white TPO reflects heat, a major advantage on low-slope sections over Austin living space with little attic buffer.
- Mixed roofs are common: main pitched roof plus flat addition or patio cover. The calculator must allow a flat section as part of a larger roof, not only whole-home flat.
Permit and code note
Drainage and permit: re-roofs that change drainage, add slope with tapered insulation, or touch structure need permit review in Austin. Interior drains and scuppers must meet code. Photograph ponding before tear-off for the file.
Austin example
Example: a mid-century home with a 1,500 sq ft TPO section over an addition typically lands near $12,500.
Frequently asked questions
Recoat vs replace?
Recoat works if the membrane is sound and seams hold. If water has damaged the deck or seams fail, replacement wins. A crew has to inspect before quoting recoat.
How long does TPO last?
15 to 25 years with maintenance. Ponding water and poor seams shorten it.
Where do flat roofs leak?
At seams, penetrations, drains, and scuppers. Ponding over 48 hours after rain is a failure sign in this climate.
Sources
Ranges on this page come from published Austin cost guides (Angi Austin, Ja-Mar Austin 2026, Modernize, Texas Certified Restoration, AllBetter 2026). Estimates only, not quotes. Final price depends on size, access, and condition found on site.