How to Estimate a Roofing Job: Measuring Squares, Materials, Labour and Pricing
How to estimate a roofing job step by step
To estimate a roofing job: measure the roof area (on site, from drone/satellite reports), convert to roofing squares (1 square = 100 sq ft), apply a pitch multiplier and waste factor, list materials, add tear-off, disposal and labour, then add overhead and profit. Present the estimate clearly with options.
Step by step
- Measure: length × width of each roof plane, or use aerial measurement reports
- Adjust for pitch: steeper roofs have more surface area; apply a pitch factor
- Convert to squares: total sq ft ÷ 100
- Add waste: commonly 10–15% depending on complexity (hips, valleys, dormers)
- Materials: shingles/metal, underlayment, ice and water shield, starter strips, ridge caps, flashing, drip edge, vents, nails
- Tear-off and disposal: layers to remove, dumpster and disposal fees
- Labour: crew hours based on squares, pitch, height and complexity
- Extras: decking replacement, skylights, chimneys, permits
- Overhead and profit: insurance, vehicles, office, marketing plus margin
- Present: clear written estimate with good/better/best options and warranty details
Example structure
| Line item | Basis |
|---|---|
| Materials | Squares × cost per square + accessories |
| Tear-off | Squares × layers × rate |
| Labour | Squares × labour rate (adjusted for pitch) |
| Disposal | Dumpster/tonnage |
| Overhead + profit | Percentage or markup |
Tools that speed up estimates
Aerial measurement reports, roofing estimating software and digital proposals with e-signature.
(Marketing: How to market a roofing company. Starting out: How to start a roofing company.)
Frequently asked questions
How do you estimate a roofing job?
Measure the roof, convert to squares, adjust for pitch and waste, price materials, tear-off and labour, then add overhead and profit.
What is a roofing square?
100 square feet of roof surface.
How much waste should I add to a roofing estimate?
Often 10–15%, more for complex roofs with many hips and valleys.
How do you measure a roof without climbing it?
Use aerial or satellite measurement reports or drones.
How do roofers calculate labour?
By squares, pitch, height, layers to remove and complexity.
Should a roofing estimate include options?
Yes; good/better/best options help customers choose and often raise average job value.
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AI & automation engineer · websites, apps and motion design
I build AI agents, automations, websites, apps and motion design for businesses. These guides answer the questions people actually search, written from hands-on experience building them.
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