Start with the questions that change the price
Before any math, five decisions shape the whole estimate: is the deck attached to the structure or freestanding; how high is the walking surface above grade; does it need railing and stairs; what joist spacing will you build; and how will footings be formed. Height matters because many codes trigger railing and different connection details around 30 inches above grade.
Write these decisions into the estimate as explicit assumptions. When the customer later asks why the price moved, the answer is a changed assumption — not a changed mood.
Take off materials in structural order
Work in the order the deck gets built. Concrete and footings first (a 12-inch diameter footing, 12 inches deep, takes roughly two 60 lb bags). Then posts and beams, then joists at your chosen spacing — at 16 inches on center, joist count is length in inches divided by 16, plus one. Then decking: at 5.5-inch exposure, a 12-foot-wide deck runs about 27 rows. Railing and stairs come last, as their own measured lines.
Do not skip the connector schedule. Joist hangers, post bases, and structural screws are real money and the most commonly omitted lines on spreadsheet estimates.
Price labor from production rates
Framing, decking, railing, and stairs install at different speeds. Estimate hours per phase using rates you trust — ideally from your own completed jobs — and multiply by your loaded crew rate, not the wage on the paycheck.
How Drevanto handles this exact scope
A supported pressure-treated deck scope is one of Drevanto's certified Instant assemblies: describe the scope, and the deterministic engine produces an editable draft — materials, labor hours with crew reasoning, and readiness checks — without any generative-AI provider calls. The certified example and its full material and labor breakdown are public on the Instant Estimates page, and the timing benchmark is public on the Benchmark page.
Every output stays editable. Pricing is yours; local code, site conditions, and structural details still require your verification.