⬛
Flat / Low-Slope Roof Cost 2026
TPO, EPDM, and PVC membrane systems built for low-slope residential additions and commercial roofs.
$10,800 – $15,300
for an 1,800 sq ft roof
Pricing by Tier
National average pricing — per sq ft installed.
| Tier | Price | Notes |
|---|
| Modified Bitumen |
$4.50–$6.50 /sq ft |
Torch-down or peel-and-stick, budget-friendly |
| Built-Up Roofing (BUR) |
$4.50–$7.00 /sq ft |
Multi-ply tar-and-gravel system, proven durability |
| EPDM (Rubber) |
$5.00–$7.50 /sq ft |
Synthetic rubber membrane, widely used and easy to repair |
| TPO (Most Popular) |
$6.00–$8.50 /sq ft |
Reflective, energy-efficient, the fastest-growing flat roof material |
| PVC |
$6.50–$9.50 /sq ft |
Most chemical- and fire-resistant membrane option |
What to Know
- ✓Common on additions, garages, modern-style homes, and commercial buildings
- ✓TPO and PVC membranes reflect heat, reducing cooling costs
- ✓Typically installed in a single day for smaller residential sections
- ✓10–25 year lifespan depending on membrane type and maintenance
Flat / Low-Slope Roof Cost by State
California$16,000–$22,650
Texas$11,350–$16,050
Florida$11,900–$16,850
New York$15,650–$22,200
Pennsylvania$11,900–$16,850
Illinois$12,750–$18,050
Ohio$10,250–$14,550
Georgia$10,250–$14,550
Arizona$11,350–$16,050
FAQs
How much does a flat roof cost for an average home?
For an 1,800 sq ft flat or low-slope section, TPO — the most commonly installed membrane today — runs about $10,800–$15,300 installed. EPDM rubber comes in a bit lower at $9,000–$13,500.
What’s the difference between TPO and EPDM?
TPO is a reflective, heat-welded membrane that’s become the most popular flat roofing choice due to energy efficiency and seam strength. EPDM is a synthetic rubber membrane that’s been used for decades, costs slightly less, and is easy to patch, but is less reflective (typically black).
How long does a flat roof last?
Most flat roofing membranes last 10–25 years depending on material and maintenance — PVC and TPO tend toward the higher end, while modified bitumen is on the lower end.
Do flat roofs need more maintenance than sloped roofs?
Yes — because water doesn’t drain as quickly, flat roofs benefit from annual inspections to check drains, seams, and ponding water, especially after major storms.