Flat Roof Replacement Cost Calculator
TPO, EPDM or modified bitumen replacement cost.
Enter your values
Enter the roof area in sq ft.
Choose one of: EPDM rubber, TPO, PVC, Modified bitumen, Built-up (BUR).
Enter the existing layers to tear off you are working with.
0 if none
Enter the access difficulty in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- 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 $5–12 per square foot installed: EPDM is cheapest, PVC and insulated TPO systems cost the most.
cost = area × material rate + tear-off + insulation
At a glance
| What it does | TPO, EPDM or modified bitumen replacement cost. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Roof area, Membrane, Existing layers to tear off, New insulation, Access difficulty |
| Main output | Estimated total |
| Formula | cost = area × material rate + tear-off + insulation |
| Cost | Free — no sign-up, no download |
How to use the Flat Roof Replacement Cost Calculator
- 1Measure the flat roof area in square feet.
- 2Choose the membrane you want quoted.
- 3Enter how many old layers must come off.
Inputs explained
- Roof area(sq ft)
- Enter the roof area in sq ft.
- Membrane
- Choose one of: EPDM rubber, TPO, PVC, Modified bitumen, Built-up (BUR).
- Existing layers to tear off
- Enter the existing layers to tear off you are working with.
- New insulation($/sq ft)
- 0 if none
- Access difficulty(%)
- Enter the access difficulty in %.
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.
What do I need to enter into the Flat Roof Replacement Cost Calculator?
Just 5 values: roof area, membrane, existing layers to tear off, new insulation, access difficulty. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Flat Roof Replacement Cost Calculator work out the answer?
Flat roof replacement runs about $5–12 per square foot installed: EPDM is cheapest, PVC and insulated TPO systems cost the most. It applies the formula cost = area × material rate + tear-off + insulation and shows the working so you can check each step by hand.
Is the Flat Roof Replacement Cost Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.