Free commercial roof estimate worksheet

TPO and EPDM Estimate Software for Small Contractors

Small commercial roofing teams can use the free calculator to build a first-pass TPO or EPDM estimate from visible assumptions. The page explains the math so the estimator can tune material, labor, tear-off, and overhead before relying on the draft.

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Formula

Commercial low-slope estimate = material + labor + tear-off + permit + disposal + overhead/profit

Squares = roof area / 100.
Material cost = squares x selected system material rate x complexity multiplier.
Labor cost = squares x selected system labor rate x complexity multiplier, with a story-height adjustment when applicable.
Tear-off and disposal are added when tear-off is included.
Permit is estimated from the larger of the minimum permit value or area-based permit value.
Overhead/profit is applied to the subtotal as a reviewable planning assumption.

Worked example

8,000 sq ft 60-mil TPO planning estimate

Inputs

Roof area: 8,000 sq ft
System: 60-mil TPO
Complexity: moderate
Stories: 1
Tear-off included

Calculation

What the worksheet does

1Squares = 8,000 / 100 = 80.
2Material = 80 x $550 x 1.0 = $44,000.
3Labor = 80 x $140 x 1.0 = $11,200.
4Tear-off = 80 x $45 = $3,600; disposal = 80 x $25 = $2,000.
5Permit = max($200, 8,000 x $0.15) = $1,200.
6Subtotal = $62,000; overhead/profit at 20% = $12,400; planning total = $74,400.

The result is a reviewable planning number, not an auto-approved bid. Supplier pricing, fastening pattern, insulation, warranty, access, and wet substrate conditions still need estimator review.

Upgrade timing

When to upgrade from the free TPO/EPDM worksheet

Stay with the free tool for one-off planning. Move to a paid workspace when the same work needs persistence, review handoff, branded output, or team coordination.

You need to save commercial assemblies, bid packages, and exclusions for repeated low-slope work.

You want material, labor, scope notes, and proposal drafts connected in one estimator workspace.

You need branded reviewed outputs and team handoff for estimator, owner, and project-manager workflows.

Move between the tool, blog, and pricing

Roofing Cost Calculator Material calculator Labor planner Commercial estimating Commercial roofing guides Pricing

FAQ

Practical limits

Does this handle TPO and EPDM differently from shingles?

Yes. The material calculator treats membrane roofs as rolls, insulation boards, cover boards, fasteners, and adhesive instead of shingle bundles.

Is the free worksheet enough for a final commercial bid?

Use it as a starting worksheet only. Final commercial bids need project specs, manufacturer requirements, local supplier pricing, code requirements, access review, and human estimator sign-off.