How Much Does It Cost to Build a Deck?

How much does a deck cost is the first question almost every homeowner asks, and the honest answer is a range wide enough to be almost useless on its own — roughly $30-60 per square foot installed nationally in 2026, covering everything from a basic pressure-treated platform to a hardwood deck with cable railing. The gap comes down to three things: material, size, and how much of the labour you do yourself. This guide breaks the national numbers down by material and by DIY versus contractor, walks through where the money actually goes on a professional build, and works a real budget for a common deck size so you can see how the pieces add up.

How Much Does a Deck Cost in 2026?

The $30-60 per square foot figure from Angi's 2026 data, corroborated by NerdWallet's guide to deck costs, covers the full installed price, materials and labour together, for a typical attached deck. A small, simple pressure-treated deck sits toward the bottom of that range. A large deck in composite or hardwood, with built-in seating, a shade structure, or multi-level framing, sits at the top or above it. DeckHelm's own cost bands, built from real material and labour pricing, land in a similar place: DIY pine framing and decking typically runs $20-35 per square foot in materials alone, a contractor-built pressure-treated deck runs roughly $35-50 per square foot installed, and a contractor-built cedar or redwood deck runs $45-60 or more, once you factor in the higher material cost and the extra care those species need during installation.

Deck Cost by Material: Pressure-Treated, Composite, and Hardwood

Pressure-treated pine is still the cheapest way to frame and deck a structure, at roughly $3-6 per square foot for materials alone, and it remains the default choice for framing even on decks finished in a different surface material. Composite decking — the boards themselves rather than the frame beneath — runs roughly $5-14 per square foot, a wide range driven by brand, colour, and whether it is capped or uncapped composite. Exotic hardwoods such as ipe or cumaru sit at $10-20 per square foot for materials, reflecting both the raw cost of the timber and the harder, slower work of cutting and fastening it. Industry market research on the decking and railing market points to composite growing faster than wood overall, as homeowners increasingly trade a lower material cost for less annual maintenance. Our full composite decking vs wood cost comparison breaks the maintenance trade-off down further.

DIY vs Contractor: Where the Savings Actually Come From

Doing your own framing is where the real DIY savings live, since labour is roughly half of a typical contractor quote, and framing is the most labour-intensive stage relative to material cost. A homeowner who frames a deck themselves, using a joist span calculator and a footing calculator to size the structure correctly, then hires a contractor only for decking and railing, can realistically land closer to the DIY end of the cost range while still getting a professional finish on the visible surface. Full DIY — framing, decking and railing all handled by the homeowner — saves the most but demands the most time, tools, and confidence with a circular saw and a post-hole digger. Full contractor builds cost the most but transfer essentially all of the risk, and all of the permit paperwork, off the homeowner's plate.

Where Does the Money Actually Go on a Contractor Build?

On a typical contractor-built deck, labour makes up roughly half of the total price, sometimes more on a complex design with multiple levels or built-in features. That labour covers layout and excavation, footing work, framing, decking installation, railing, and stairs, plus the overhead of permits, inspections, and site cleanup. Materials make up the rest, split between the framing lumber, usually pressure-treated regardless of the finished surface, and the visible decking and railing material, which is where cost swings hardest between a basic pressure-treated board and a premium composite or hardwood. Professional labour alone runs roughly $15-35 per square foot, a range wide enough to reflect both a simple rectangular platform and a deck with curves, multiple levels, or extensive stairs. For a fuller breakdown, see our guide to labor cost to build a deck.

Why Tall or Complex Decks Cost More Than Flat, Ground-Level Ones

Height and complexity add cost disproportionately to square footage. A deck sitting three feet above grade needs full-sized footings, sized to bearing capacity and frost depth, taller posts, and a full guard system at 36 inches minimum with baluster spacing tight enough to block a 4 inch sphere, none of which a ground-level platform needs. Stairs add another layer, since every flight needs its own stringers, a landing, and often its own footing, and stairs are labour-intensive relative to the small amount of square footage they occupy — see our guide on how to build deck stairs for the full stringer and landing breakdown. A multi-level deck effectively multiplies these costs, since each level needs its own framing, its own stair connection, and sometimes its own set of footings. Two decks of identical total square footage, one flat and ground-level, one raised and split across two levels, can differ in price by thousands of dollars purely because of footings, stairs, and railing.

Worked Example: Budgeting a 12x20 Deck

A 12x20 foot deck is 240 square feet, a common size for a family that wants space for a table and a grill without taking over the whole yard. At the low end, DIY framing and decking in pressure-treated pine at roughly $25 per square foot puts total materials around $6,000. A full contractor build in pressure-treated pine at roughly $42 per square foot installed lands around $10,000. The same footprint in contractor-installed composite, at roughly $47 per square foot, comes in around $11,300, and in contractor-installed cedar at roughly $52 per square foot, around $12,500. Add a set of stairs and a taller elevation and each of those figures climbs, since footings, stringers, and railing length all increase with height. Run your own footprint through a deck cost calculator to see where it lands.

Is a Deck Worth It at Resale?

Financially, a deck is a solid investment without being a spectacular one. The 2025 Cost vs. Value Report found deck additions return roughly 65.8-82.9% of their cost at resale depending on material, a healthy return but below the very top exterior projects such as garage door or entry door replacement. That said, resale value is only part of the picture. Houzz's 2026 Outdoor Trends Study found 71% of homeowners hired at least one professional for their outdoor project, up from 65% in 2024, and the share renovating mainly for everyday living, rather than resale, rose to 25%, suggesting more homeowners are building decks to actually use rather than purely to flip.

“Homeowners who ask for a framing quote and a decking quote separately usually understand their own budget better than the ones who ask for one number, because half the cost of most decks is labour, not lumber.”

Pull your own deck's rough dimensions and target material together, then run them through a cost calculator to see where your project actually lands inside these ranges before you start collecting contractor quotes. Knowing your own number first makes every quote you get afterward much easier to judge.