Free Contractor Tool
Deck Cost Calculator
Estimate what a deck costs to build by size, material, and height — with railing and stairs priced as their own line items, because that is where a third of the budget usually hides.
Built by SubcontractorHub — the software contractors use to quote, finance, and run every job.
Book a Demo
Estimate Your Deck Building Cost
Enter dimensions and pick a material. Height, shape, and region adjust the rate; railing and stairs are calculated separately and the result shows what share of the total they represent.
$15–$30/ft² • life 10–15 yrs • Stain every 2–3 yrs
Guardrail required by code at this height.
Leave blank to assume 3 open sides (40 ft). $30/ft installed.
$120–$250 per step installed.
Estimated installed cost
$4,664 – $9,442
192 ft² deck • $37/ft² all-in
Deck surface
$3,110–$6,221
Railing (40 ft)
$864–$1,296
Stairs (5)
$540–$1,125
Add-ons
$150–$800
34% of this estimate is railing, stairs, and add-ons — not the deck surface itself.
Reading the result: that last figure is the one most homeowners miss. A per-square-foot quote that excludes railing and stairs is not comparable to one that includes them, and the gap is routinely a third of the job.
Decking Material Cost Comparison
Installed cost per square foot of deck surface, plus railing rate and expected life. Maintenance is the column that decides 20-year cost.
Height costs more than material
Going from ground level to a second-story deck adds about 75% per square foot before you change a single board. Deeper footings, larger framing lumber, lateral bracing, and the labor of working at height all scale with elevation.
Crossing 30 inches above grade also triggers a code guardrail requirement. At $30–$75 per linear foot, that single threshold can add several thousand dollars to an otherwise identical deck.
Composite vs. wood over 25 years
Capped composite costs roughly double pressure-treated pine upfront. But pine needs staining every two to three years at $500–$1,500 a cycle, which across 25 years typically exceeds the original price gap — and pine lasts 10–15 years against composite’s 25–30.
Pine still makes sense on a fixed budget, on a deck meant to carry a house to sale, or on very large decks where the upfront difference is hard to absorb. Framing under either is pressure-treated regardless.
From Material Takeoffs to a Signed Proposal
SubcontractorHub is the platform contractors use to turn takeoffs like these into a branded proposal, financing the customer can accept on the spot, and a scheduled job — without re-entering the job anywhere. This tool is free to use; the platform is here if you want a closer look.
Deck jobs are usually won on the quality of the quote, because homeowners are comparing three bids that all say “per square foot” and mean different things. Itemizing surface, railing, and stairs separately makes your number legible — and a monthly payment makes the composite upgrade an easy yes. See proposal software and embedded financing.
Common Questions About Deck Cost
How much does a deck cost to build?
A typical 300–400 ft² deck runs $6,000–$20,000 installed. Per square foot of surface: roughly $15–$30 pressure-treated pine, $22–$42 cedar, $30–$60 capped composite, $35–$70 PVC, $40–$85 tropical hardwood — framing, decking, and labor included. Railing and stairs are separate and commonly add 20–35%, which is why per-square-foot quotes often are not comparable.
How much does a 12x16 deck cost?
That is 192 ft². Ground-level in pressure-treated pine, roughly $3,500–$7,000; capped composite $6,500–$13,000; PVC $7,500–$15,000. Raising it to a standard 4 ft adds about 20% for deeper footings and taller framing, and makes guardrail mandatory — figure another $1,400–$2,900 for about 44 linear feet of railing plus a stair set.
Is composite decking worth the extra cost?
Over a long horizon, usually. Composite is about double pine upfront but needs only washing, while pine needs staining every two to three years at $500–$1,500 a cycle. Across 25 years those cycles typically exceed the original gap, and composite lasts 25–30 years against pine's 10–15. Pine still wins on a fixed budget, before a sale, or on very large decks.
Do I need a permit to build a deck?
Almost always — typically $150–$800. Most jurisdictions require one for any deck attached to the house or above about 30 inches. Inspections usually cover footing depth before the pour and a final structural check. Unpermitted decks routinely surface during a home sale and can force retroactive corrections, and a failure may not be covered by insurance.
What adds the most cost to a deck?
Height, then railing, then shape. Elevation changes footing depth, framing size, and bracing — a second-story deck runs about 75% more per square foot than the same deck at ground level. Railing is $30–$75 per linear foot and becomes mandatory above 30 inches. Curved or multi-level designs add 15–30% in labor. Decking material matters less than expected, since framing and labor dominate regardless.
How long does a deck take to build?
A straightforward ground-level 200–400 ft² deck takes one to two weeks on site; raised and multi-level decks two to four weeks. Schedule usually hinges on permitting and inspection timing more than construction — footing inspections must clear before concrete is poured. Weather delays hit deck jobs harder than most trades since the work is entirely outdoors.
Quote, Finance, and Run Every Job in One Platform
SubcontractorHub helps contractors turn field measurements into accurate proposals, present financing, and close jobs on-site — built for the way contractor sales actually works.
Book a Free DemoCost ranges are national planning estimates based on typical published contractor pricing, adjusted by the height, shape, and region factors you select. Framing, footing, and railing requirements are set by local code and vary by jurisdiction. Verify structural requirements and pricing with a licensed contractor and your local building department before bidding or building.