Deck Cost in 2026: Pressure-Treated Wood vs Composite
Deck quotes swing on three things: how high the deck sits, what the surface is made of, and how much railing is required. Size matters less than most homeowners expect.
Short answer. Most homeowners pay $4,000 to $14,000 for a deck build, with a typical mid-grade project around $9,000. The spread is driven by scope, not by the size of the room.
A ground-level 12x16 pressure-treated deck and a 12x16 composite deck on the same footprint can differ by $8,000, because composite boards cost two to three times as much per linear foot and need different fasteners and framing details.
Height is the other multiplier. Anything above 30 inches usually requires a permit, longer posts, deeper footings and a guard rail on every open side — railing alone can be 15–20% of the project.
Cost by scope of work
The same room can fall into three different rows. Decide which one you are actually buying before you compare bids.
| Scope of work | Typical cost | What is included |
|---|---|---|
| Pressure-treated, ground level | $4,000 – $7,000 | 12x16 ft, low to grade, basic rail on one side, no stairs. |
| Pressure-treated, elevated with stairs | $8,000 – $12,000 | Posts to frost depth, full guard rail, one flight of stairs. |
| Composite with railing | $12,000 – $20,000 | 12x20 ft composite boards, aluminium or composite rail, hidden fasteners. |
| Composite with cover or screen | $22,000 – $40,000 | Pergola, roof structure or screened enclosure over a composite deck. |
Where the money goes
A typical mid-range budget breaks down like this. Material-heavy projects (roofing, siding) put more into product; labour-heavy projects (painting, tile) put more into hours.
| Line item | Share | Cost |
|---|---|---|
| Labour | 27% | $2,430 |
| Framing lumber and footings | 24% | $2,160 |
| Decking boards | 22% | $1,980 |
| Railing system | 15% | $1,350 |
| Fasteners and flashing | 4% | $360 |
| Stairs | 4% | $360 |
| Permit and inspection | 4% | $360 |
Illustrative budget for a ≈ $9,000 deck build. Percentages are shares of the total project cost, not markups on materials.
What moves the price
Height and footings
A deck under 30 inches can sit on shallow pads. Above that, posts go to frost depth — 36 to 60 inches in northern states — with concrete and inspection. That is $2,000–$6,000 of work you never see.
Board material
Pressure-treated pine is the cheapest surface and needs staining every two to three years. Composite costs two to three times more up front and needs no annual finish. Over 20 years the gap narrows considerably.
Railing length
Railing is priced by the linear foot, roughly $40–$90 installed depending on material. A deck with three open sides costs far more in rail than an L-shaped deck against the house.
Site access and grade
A sloping yard, a fence in the way, or a deck that requires excavation changes the labour line. Ask whether the quote includes footing excavation and spoil removal.
How much does it cost in your state?
Labour rates, permit fees and material logistics vary enough that a national range is only a starting point. California and New York run 30–35% above the national average for the same scope; Mississippi, Ohio and Texas run below it.
| State | Cost index | Adjusted planning range |
|---|---|---|
| California | 1.30 | $5,200 – $18,200 |
| New York | 1.35 | $5,400 – $18,900 |
| Massachusetts | 1.32 | $5,300 – $18,500 |
| Washington | 1.22 | $4,900 – $17,100 |
| Florida | 1.05 | $4,200 – $14,700 |
| Texas | 0.95 | $3,800 – $13,300 |
| Ohio | 0.90 | $3,600 – $12,600 |
| Mississippi | 0.82 | $3,300 – $11,500 |
Index 1.00 = the national average used in the range above. Derived from published labour-rate and material-cost differentials, then applied to the national range and rounded to the nearest $100. Treat it as a planning band, not a quote.
Local permits and HOA rules add cost that no index captures. Two or three written quotes for your address remain the only accurate number.
How to get a number you can trust
- Write the scope down. List what is being removed, what is being installed, and what is explicitly excluded. A bid is only comparable to another bid with the same scope.
- Get three written quotes. Ask each contractor to state the permit holder, the payment schedule and the change-order rate. Verbal estimates are not quotes.
- Hold a contingency. 10–15% on any project that opens a wall, a floor or a roof. Hidden conditions are the norm, not the exception.
- Check licensing and insurance. Verify the licence number with the state, and ask for a certificate of insurance naming you as additionally insured.
Frequently asked questions
How much does a deck cost per square foot?
Pressure-treated wood runs $25–$60 per sq ft installed; composite runs $45–$95. The spread inside each range is height, railing and stair count — not board price.
Is composite decking worth the extra cost?
Over a 15–20 year horizon, yes for most homeowners: composite avoids annual staining, does not splinter, and holds colour. If the deck is small or you may move soon, pressure-treated recovers its cost faster.
Do I need a permit to build a deck?
In most jurisdictions, yes for any deck above 30 inches, and often for anything attached to the house regardless of height. The permit requires a footing inspection before framing — schedule it, do not skip it.
How long does it take to build a deck?
One to two weeks for a typical 12x16 deck, weather permitting. Footing inspection can add a day or two of waiting mid-project.
Can I add a roof or screen to a deck later?
Only if the framing was designed for it. Posts, beams and footings have to carry the additional load, so tell the builder at design time even if you plan to add the cover in a few years.
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Last updated: November 2026. Figures are planning estimates for general information, not a quote or a contract.