Roofing
EPDM Roof Cost Calculator
Cost an EPDM installation from sheet size, attachment, seam tape and the flashing details.
Result
A planning estimate, not a quote. Access, the age of the equipment, what is found once it is opened up and local labour rates all move the real figure, sometimes a long way.
Get a Free Business AuditWhat moves the number
- Sheet width, since wider sheets mean fewer seams and less labour.
- Attachment: ballasted, mechanically fastened or fully adhered.
- Penetration count, because each one is a hand-formed detail.
Where this one goes wrong
Costing adhesive and primer casually. On a fully adhered EPDM roof the adhesive quantity is significant, it is temperature sensitive to apply, and running short mid-installation is a serious problem rather than an inconvenience.
Questions
About this calculator
How does EPDM compare to TPO on cost?
They differ in material, in how seams are made and in how they behave in sun and heat. The right comparison is on installed cost and expected life for the specific building rather than on a per-square headline.
Why do wider sheets matter?
Fewer seams. Seams are where low-slope roofs fail and where the labour is, so a layout that minimises them is both cheaper to install and more reliable.
Does temperature affect installation?
Yes, for adhesives and seam tapes in particular. Manufacturers specify application temperature ranges, and working outside them compromises the bond regardless of how carefully it is done.
The formula
total = hours x people x rate + parts + call-out, then sales tax
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How to use this calculator
- Hours on site (h). Enter your own figure; the page starts at 26 h.
- People needed. Enter your own figure; the page starts at 1.
- Labour rate charged ($). Enter your own figure; the page starts at $95.
- Parts and materials ($). Enter your own figure; the page starts at $3,900.
- Call-out or diagnostic fee ($). Enter your own figure; the page starts at $95.
- Sales tax (%). Leave at zero if you are quoting before tax.
The result updates as you type, so you can try a figure, see what it does to estimated total, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Hours on site | 26 h |
| People needed | 1 |
| Labour rate charged | $95 |
| Parts and materials | $3,900 |
| Call-out or diagnostic fee | $95 |
| Sales tax | 0% |
What comes out
| Result | Value |
|---|---|
| Estimated total main result | $6,465 |
| Labour | $2,470 |
| Before tax | $6,465 |
| Sales tax | $0 |
About $6,465: $2,470 of labour, $3,900 of parts and a $95 call-out.
How sensitive the answer is
Holding everything else steady and changing only labour rate charged, this is what happens to estimated total. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Labour rate charged ($) | Estimated total |
|---|---|
| $48 | $5,243 |
| $71 | $5,841 |
| $95 example above | $6,465 |
| $143 | $7,713 |
| $190 | $8,935 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Hours on site (h)
- Measured in h, between 0 and 400, starting at 26 h.
- People needed
- A number, between 0 and 40, starting at 1.
- Labour rate charged ($)
- A money amount, starting at $95.
- Parts and materials ($)
- A money amount, starting at $3,900.
- Call-out or diagnostic fee ($)
- A money amount, starting at $95.
- Sales tax (%)
- Leave at zero if you are quoting before tax.
What the results tell you
| Result | What it is |
|---|---|
| Estimated total | The headline result. A money figure. |
| Labour | A money figure. |
| Before tax | A money figure. |
| Sales tax | A money figure. |
What this cannot see
Material quantities assume a clean rectangular plane and the waste factor you enter. Valleys, hips, dormers, penetrations and a steep pitch all raise real waste, and a tear-off frequently uncovers decking that was not in the quote.
Estimating is the easy part
The jobs you never hear about cost more than the ones you mis-measure. BDEVY builds the marketing, systems and automation that bring them in.