Commercial and flat roof replacement cost in 2026: TPO, EPDM and modified bitumen
What commercial and flat roof replacement costs per square foot in 2026 by membrane, what drives the price, recover versus tear-off, and how flat roofs are measured from satellite imagery.
A flat roof is the easiest roof in the world to measure from above: its area is simply its footprint, with no pitch to account for. It is also the hardest to price from that number alone, because on a commercial roof the money is in the details.
Flat roof cost per square foot in 2026
| Membrane | Per sq ft installed | Typical life |
|---|---|---|
| EPDM (rubber) | $5.50-$10 | 20-30 yrs |
| TPO | $6-$11 | 20-30 yrs |
| PVC | $7-$13 | 20-30 yrs |
| Modified bitumen | $7-$14 | 15-25 yrs |
A 10,000 square foot building therefore lands somewhere between about $55,000 and $140,000 — a range that wide is why the details below matter more than the membrane.
What actually moves a commercial bid
- Tear-off or recover. Removing layers is labour and disposal; a recover skips it where code and condition allow.
- Insulation. Energy codes set a minimum R-value for tear-offs, and tapered insulation for drainage adds up.
- Penetrations and rooftop units. Every HVAC unit, vent and pipe needs flashing detail.
- Drains, scuppers and parapets. Edge and drainage work is slow and specialised.
- Access and phasing. An occupied building, cranes, night work.
Recover or tear-off
A recover puts new insulation and membrane over the existing roof and can save a large share of the cost. It only works when the existing roof is dry and sound, and building codes typically allow a single recover. Trapped moisture — found with an infrared or core survey — means tear-off.
Measuring a flat roof from satellite
Because the roof is flat, the satellite footprint is the roof area — no pitch multiplier. That makes aerial measurement very reliable for quantity. Try it on our roof area calculator, or ballpark a job with the flat roofing estimate. The site survey then prices what imagery cannot see.
Common questions
How much does a commercial flat roof cost per square foot?
Roughly $5.50-$14 installed, by membrane, insulation and detail work.
Should I recover or tear off?
Recover only over a dry, sound, single-layer roof; otherwise tear off.
Can a flat roof be measured from satellite?
Yes — its footprint is its area. Details still need a survey.
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