How to Estimate a Siding Job
Siding bids go wrong on squares, trim and tear-off. This checklist keeps all three in the number.
Squares and waste first
Convert wall area to squares, subtract large openings, and add 10–15% waste for gables, corners and cuts. This is the biggest source of siding error — the siding calculator keeps the units and waste right.
The costs that sink siding bids
Trim, soffit, fascia, corner posts and J-channel; house wrap and flashing; and tear-off and disposal of the old siding. Price each as a line item, plus the labor hours the material really needs.
FAQ
What do contractors forget when bidding siding?
Trim, soffit, fascia, corner posts, J-channel, house wrap, and tear-off/disposal — plus underestimating waste on gables and openings.
How do I price siding labor?
Apply a crew rate to the squares, adjusted for the material (fiber cement is slower than vinyl) and the number of openings and stories.