deck cost calculator for illinois decks

how we priced it

The ranges come from what decks in this market actually cost to build: pressure-treated at roughly $25-$45 per square foot installed, cedar at $35-$65, and composite at $45-$90. Height adds framing and stairs, railing is priced per linear foot, and permits are folded in because we pull them for you.

What the calculator can't see is your site — grade, access, what's under the soil, how the ledger has to attach to your house. That's what the free estimate is for.

questions we get

how accurate is this deck cost calculator?

It gives a planning range based on real 2026 pricing in the Naperville and western-suburb market, including labor, materials, footings and permit handling. Site access, soil, lighting, built-in seating and custom railing can move the final number, which is why we quote in writing after a site visit.

what drives deck cost the most?

Square footage and decking material first, then height off the ground — a second-story deck needs taller posts, more bracing and longer stairs. Railing style is the third biggest lever and is often underestimated.

is the estimate free?

Yes. A ProDeck Works estimate is free and carries no obligation, and we respond within one business day.