Quick answer: Plan a new deck at $36–132 per sq ft of decking across four materials. Size it, stack add-ons like stairs or railing, and see a realistic project total fast.
Size the deck from 80 to 900 sq ft, choose pressure-treated, cedar, composite or PVC boards, and say how high it sits — raised decks price about 22% over ground level, second-storey builds 48%. Stack on real add-ons: stairs to grade at $850–1,700, glass or cable railing at $1,800–4,200, benches, privacy screens, skirting or a pergola. The default 280 sq ft pressure-treated build with stairs and permit handling estimates at $11,830–18,460 — roughly $42–66 per square foot all-in.
Pressure-treated decking runs $36–52 per square foot built, cedar $52–78, composite $72–112 and PVC $88–132. Height matters too: the calculator adds about 22% for a raised deck and 48% for a second-storey platform, since framing and railing work grow with elevation.
The permit-handling option prices the building permit and drawings at $900–2,200. Whether you need one depends on size and height in your municipality — most raised decks require it, and skipping it can surface at resale.
A flight of stairs to grade adds $850–1,700. A glass or cable railing upgrade runs $1,800–4,200, built-in benches or planters $700–1,900, a privacy screen wall $900–2,400, under-deck storage or skirting $600–1,500, and a pergola over part of the deck $2,600–6,500.
Composite costs roughly double pressure-treated up front — $72–112 versus $36–52 per square foot — but skips the staining cycle. Run both materials through the calculator at your size; on a smaller deck the dollar gap may be narrower than you expect.
Every calculator runs from one config: your name, your colours, your prices. Brand it below, open any tool from the catalogue, and finish a quote — the lead lands in the table here the moment the estimate unlocks. On your own site the widget works exactly like this.
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