Flat Roof Replacement Cost Calculator
TPO, EPDM or modified bitumen replacement cost.
Enter your values
0 if none
ⓘ Live results
Results
- Estimated total
- $19,387.50
- Membrane & install
- $12,000.00
- Tear-off
- $1,875.00
- Insulation
- $3,750.00
- Cost per sq ft
- $12.93
- Roof squares
- 15
Quick answer
Flat roof replacement runs about $5–12 per square foot installed: EPDM is cheapest, PVC and insulated TPO systems cost the most.
cost = area × material rate + tear-off + insulation
How to use the Flat Roof Replacement Cost Calculator
- 1Measure the flat roof area in square feet.
- 2Choose the membrane you want quoted.
- 3Enter how many old layers must come off.
Inputs explained
- New insulation($/sq ft)
- 0 if none
Worked example
Using the values the calculator loads with:
Inputs
- Roof area1500 sq ft
- MembraneTPO
- Existing layers to tear off1
- New insulation2.5 $/sq ft
- Access difficulty10 %
Results
- Estimated total$19,387.50
- Membrane & install$12,000.00
- Tear-off$1,875.00
- Insulation$3,750.00
- Cost per sq ft$12.93
- Roof squares15
Frequently asked questions
How much does a flat roof cost per square foot?
About $6 for EPDM, $8 for TPO and $10–12 for PVC or built-up, including tear-off in most markets.
How long does a TPO roof last?
20–30 years with proper thickness (60 mil or more) and annual seam inspections.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.