Contractor measurement takeoffs
A takeoff is the list of quantities a roofer prices a job from. It turns the size and shape of a roof into squares of shingles, rolls of underlayment, lengths of metal and counts of vents. Homeowners rarely see the full takeoff, but every line of a roofing quote depends on it.
What it contains
From measurements to materials
- Roof areaTotal squares, usually with a waste percentage added for cutting. A quote may show the area before waste, after waste, or both.
- PitchThe pitch of each section. It changes the surface area and the labor, since steep roofs take longer and need more safety equipment.
- EdgesLinear feet of eave and rake for drip edge and starter strip, and of ridge and hip for ridge cap, and of ridge for ridge vent.
- Valleys and wallsLinear feet of valley, and of step and apron flashing where the roof meets a wall.
- PenetrationsCounts of plumbing vents, fans, skylights and chimneys, each needing its own flashing or boot.
- Tear-off and deckingThe number of existing layers to remove, and an allowance or unit price for replacing damaged decking.
- MaterialsBundles of shingles, rolls of underlayment and ice and water membrane, pieces of metal, ventilation parts and fasteners.
Who produces it
Usually the roofer or the estimator
The contractor quoting the job normally builds the takeoff, from their own on-site measurements, from an aerial measurement report they have ordered, or from both. Some roofing suppliers also prepare material lists for contractors from the same measurements.
Because a takeoff is a working document, its format varies widely. It might be a printed report with a diagram, a spreadsheet, or a few lines of handwritten notes. What matters is the method behind it and whether its quantities fit the roof.
What it can and cannot tell you
The basis of a price, not a verdict on the roof
A takeoff shows what the contractor believes the job involves. Comparing the square counts and edge lengths behind two quotes tells you whether both contractors are pricing the same roof. A large gap usually points to a difference in scope, method or waste, and it is worth a question.
A takeoff does not tell you whether the roof needs replacing, and it says little about condition beyond the number of layers and a decking allowance. It is also prepared by someone who hopes to win the job. Most contractors measure carefully, but a takeoff is not an independent document.
Questions to ask
About the numbers behind a quote
- How did you measure the roof, and can I see the measurement report or diagram?
- How many squares are you pricing, and does that include waste? At what percentage?
- Which parts of the house are included: the main roof, the porch, the garage, any low-slope sections?
- How many existing layers are you assuming, and what happens to the price if you find more?
- What do you charge per sheet if damaged decking turns up?
- Are drip edge, starter strip, ridge cap, flashing and vents listed as new?
- If the installed quantities come out smaller or larger than the takeoff, how does the price change?
Limits
Why two takeoffs rarely match
Two careful contractors can produce different takeoffs for the same roof. One includes a detached garage and the other does not. One adds 10 percent waste and the other 15. One measures on site while the other works from imagery. Rounding up to whole bundles and full lengths of metal adds a little more. Small differences are normal. A difference of several squares on an ordinary house deserves an explanation.
When you compare prices, divide every quote's total by the same trusted square count rather than by each quote's own figure. How to compare roofing quotes works through an example.
Put the quotes side by side
The quote comparison guide shows how to line quotes up item by item against one measurement, and the hiring checklist covers what to confirm before you sign.
