Cost Guide
Cost to Build a Deck: 2026 Price Per Square Foot
What a deck costs per square foot in 2026 by decking material, plus framing, footings, railing, stairs, and permits, and the real ten-year cost of wood.
11 min read
A deck budget breaks into three pieces that almost never get priced together: the boards you can see, the frame you cannot, and the railing and stairs that code requires once the deck gets more than knee-high. Get all three on the page and the estimate stops moving. Here is what each one costs in 2026.
What a deck costs in 2026
For a professionally built deck, plan on $30 to $60 per square foot installed for pressure-treated pine and $45 to $80 per square foot for capped composite. Those figures cover the whole deck: footings, frame, decking, fasteners, a standard railing, and labor. They exclude permits, demolition of an old deck, stairs beyond a short run, and any grading or drainage work.
Common sizes at those rates:
- 12 x 12 (144 ft²): $4,300–$8,600 in pressure-treated, $6,500–$11,500 in composite
- 12 x 16 (192 ft²): $5,800–$11,500 pressure-treated, $8,600–$15,400 composite
- 16 x 20 (320 ft²): $9,600–$19,200 pressure-treated, $14,400–$25,600 composite
Building it yourself typically removes 45 to 60 percent of that, because labor is the single largest line. Material alone on a 192 square foot pressure-treated deck with railing lands around $2,800 to $5,000.
Cost per square foot by decking material
Two numbers matter and they get conflated constantly. The material-only column is what the decking boards cost at the lumberyard, per square foot of deck surface. The installed column is the whole finished deck, everything included.
| Decking material | Boards only ($/ft²) | Complete deck, installed ($/ft²) | Service life | Maintenance |
|---|---|---|---|---|
| Pressure-treated pine | $1.75–$3.50 | $30–$60 | 15–25 years | Clean and seal every 2–3 years |
| Cedar | $3.50–$7.00 | $35–$65 | 20–30 years | Clean and seal every 2–3 years |
| Redwood | $5.00–$10.00 | $40–$75 | 25–30 years | Clean and seal every 2–3 years |
| Capped composite | $4.50–$10.00 | $45–$80 | 25–35 years | Wash annually |
| PVC (cellular) | $8.00–$15.00 | $55–$95 | 30–50 years | Wash annually |
| Tropical hardwood (ipe, cumaru) | $7.00–$16.00 | $60–$100 | 40–50 years | Oil annually or let it silver |
| Aluminum | $12.00–$20.00 | $65–$110 | 40+ years | Wash annually |
A few things the table cannot show. Pressure-treated pine has the widest quality spread of anything on the list; premium kiln-dried-after-treatment boards cost 30 to 50 percent more than wet stock and stay far straighter. Composite pricing splits hard between uncapped budget lines and fully capped boards with a 25-year stain-and-fade warranty, and the cheap end is not worth buying. Ipe is dense enough that you pre-drill every fastener, which adds real labor hours on top of the material.
Run your own square footage through the Deck Board Calculator to get board counts, linear feet, and rows including a waste allowance, and check the deck cost by state data to see how far the national numbers move once you localize them.
The substructure nobody sees is half the material budget
Under the boards sits a frame: a ledger bolted to the house, beams, posts, joists at 12 or 16 inches on center, joist hangers, blocking, and structural fasteners. On a typical wood-framed deck that substructure runs roughly 40 to 50 percent of the material budget, and it is invisible the day the job is finished. This is the single biggest reason homeowners think deck quotes are inflated.
It also means the composite premium is smaller than it looks. If you upgrade from pressure-treated decking to composite, you are only changing the surface layer. The frame underneath is pressure-treated lumber either way, priced the same, and it is already half your material cost. That is why the total installed spread between a pine deck and a composite deck is roughly $15 to $20 per square foot rather than the $3 to $7 difference in board price alone.
Joist spacing drives both cost and performance. Sixteen inches on center is standard for wood and most composite laid perpendicular; twelve inches on center is required by many composite manufacturers for a 45-degree diagonal layout, which adds roughly 30 percent more joists. Size the members with the Floor Joist Calculator, and confirm spans against the locally adopted code with a licensed professional before ordering.
Budget lines worth pricing separately:
- Joists and beams: $4–$9 per square foot of deck in material
- Joist hangers and structural screws: $0.75–$2.00 per square foot
- Hidden fastener clips for grooved composite: $0.80–$2.00 per square foot
- Joist tape over the frame to shed water: $0.30–$0.70 per square foot, and one of the best cheap upgrades on the job
Footings, frost depth, and what the ground costs you
Every post lands on a footing, and the footing has to reach below the local frost line or it will heave. Frost depth ranges from effectively zero along the Gulf Coast to 48 inches or more in the northern Plains and interior New England. Your building department publishes the number for your jurisdiction and that number governs.
Expect $150 to $400 per footing installed, covering the hole, the tube form, concrete, and the post base hardware. A 192 square foot deck usually needs six to nine footings; a 320 square foot deck often needs nine to twelve. So the footing line alone is $900 to $4,800 before a single board goes down.
Volume math is simple and worth doing so you order the right amount of concrete. A 12-inch tube 48 inches deep holds about 3.1 cubic feet, or 0.12 cubic yards. Nine of those is roughly 1.1 cubic yards, which is squarely in bagged-concrete territory. The Concrete Tube Calculator will do the arithmetic and give you a bag count.
Site conditions add cost fast. Rock or heavy clay can turn a two-hour auger job into a day with a jackhammer. Poor drainage may require regrading or a French drain before you build over it. Helical piles, sometimes the right answer in unstable or filled soil, run $400 to $900 each installed but skip the digging and cure time entirely.
Height above grade: guardrails, stairs, and railing
There is a cost cliff at roughly 30 inches above grade in most jurisdictions. Below it, a deck usually needs no guardrail and no stair run. Above it, code requires a guardrail at a set height with baluster spacing that will not pass a 4-inch sphere, plus compliant stairs with a graspable handrail, uniform risers, and lighting. The locally adopted code sets the exact triggers.
Railing is the line item that surprises people. Installed costs per linear foot:
- Pressure-treated wood: $30–$60
- Cedar: $45–$80
- Composite: $60–$120
- Aluminum: $70–$140
- Cable rail: $90–$180
- Glass panel: $150–$350
A 16 by 20 foot deck open on three sides carries 56 linear feet of rail. In composite that is $3,400 to $6,700, more than the decking boards themselves. Price it as its own line, not as a rounding error.
Stairs are the other jump. A straight run costs roughly $100 to $250 per step installed for wood and $175 to $400 for composite with a matching rail, so a typical four-foot rise with six or seven steps runs $600 to $2,800. Landings, turns, and wide entertaining stairs multiply that. The Stair Calculator gives you rise, run, and stringer length so you can check that a contractor’s step count is even legal for your total rise.
Permits, setbacks, and the ledger detail that fails first
Most jurisdictions require a permit for an attached deck or one above a set height. Fees typically run $150 to $700, sometimes assessed as a percentage of project value. Plan review adds time; two to six weeks is normal. Setback rules, easements, and HOA architectural review can all limit where the deck can sit, and finding that out after the footings are poured is expensive.
The technical detail worth caring about more than any other is the ledger connection. Deck collapses are overwhelmingly ledger failures, not board failures. Two things go wrong: the ledger is nailed rather than through-bolted or attached with approved structural screws in the code-specified pattern, and the flashing above it is missing or wrong, so water runs behind the ledger and rots the rim joist it is bolted to. Neither failure is visible from the surface, and both take years to show up.
Ledger fastener size, spacing, and the flashing detail are all code-governed. Build to your locally adopted code and have a licensed professional or your building inspector confirm the connection before the frame is closed in.
Done right, ledger flashing costs almost nothing in material: metal or self-adhered flashing tucked under the house wrap and lapped over the ledger, plus a drainage gap. Done wrong, it takes out the band joist of your house. If a bid does not mention flashing at the ledger, ask. A freestanding deck on its own posts avoids the question entirely and is often the better design on stucco, brick veneer, or any wall you would rather not open.
Ten-year cost: the real composite-versus-wood argument
The upfront comparison is misleading because it prices one day and ignores the other 3,650. Here is the honest version for a 200 square foot deck.
Pressure-treated pine costs roughly $6,000 to $12,000 installed. Keeping it looking good means cleaning and re-sealing every two to three years, which is $2.50 to $5.00 per square foot professionally, or $500 to $1,000 a cycle. Over ten years that is three or four cycles, so $1,500 to $4,000 in maintenance. Doing it yourself drops the cash to $150 to $300 per cycle and costs you a weekend each time. Expect to replace a handful of split or cupped boards along the way.
Capped composite costs roughly $9,000 to $16,000 installed and needs washing. Over ten years the maintenance is a few hundred dollars in soap and time.
Add it up: pine lands around $7,500 to $16,000 all-in over a decade, composite around $9,300 to $16,300. The honest reading is that maintenance closes most of the gap without quite erasing it at year ten. Composite pulls ahead somewhere past the decade mark, and only against wood you were actually paying someone to maintain on schedule. Stain it yourself, or skip the staining entirely, and pine stays the cheaper deck for as long as it lasts.
So decide on the horizon rather than the sticker. If you are honest that the deck will get stained once and then ignored, buy pressure-treated, accept a 15-year life and a weathered gray finish, and put the savings elsewhere. If you plan to keep the house past year fifteen, or you simply do not want to spend three weekends a decade on your knees with a stain pad, composite earns its premium in time rather than dollars. The one case where composite is clearly wrong is a deck you expect to sell within a few years: the resale premium over a sound pressure-treated deck rarely returns the extra $3,000 to $4,000.
How to compare three deck bids line by line
Deck quotes are notoriously hard to compare because contractors bundle differently. Make each one break out:
- Deck dimensions and total square footage, so you can normalize everything to dollars per square foot.
- Decking product by brand and line, not just “composite.” The gap between an uncapped budget board and a capped premium board is enormous.
- Frame material and joist spacing, 12 or 16 inches on center.
- Footing count, diameter, and depth, with the frost depth they are building to.
- Ledger method and flashing detail, or a statement that the deck is freestanding.
- Fastener type: face screws, hidden clips, or plugs.
- Railing: linear feet, system, and post spacing.
- Stairs: number of risers, width, landing, handrail.
- Permit: who pulls it, who pays, and whether inspections are included.
- Demolition and disposal of the existing deck, if there is one.
- Warranty: manufacturer coverage on the boards and the contractor’s workmanship period.
- Payment schedule and proof of general liability and workers’ compensation insurance.
Once scope matches, three bids in the same market usually land within 15 to 20 percent of each other. A bid 35 percent under the rest is not a deal; it is fewer footings, wider joist spacing, a cheaper board, or a nailed ledger.
Mistakes that blow the deck budget
- Leaving railing out of the mental budget. The most common omission, and it can be a quarter of the job.
- Discovering the height trigger late. A design that lands at 32 inches above grade instead of 28 adds a guardrail around the whole perimeter and a stair run. Sometimes lowering the deck four inches saves thousands.
- Choosing a diagonal or picture-frame layout after pricing. Diagonal decking requires tighter joist spacing and adds 15 to 20 percent waste; picture framing needs extra blocking. Both are worth having, but price them before you commit.
- Undersizing the footings. The cheapest place to save money is also the one place you can never fix without demolishing the deck.
- Skipping joist tape. A few hundred dollars of tape adds years to a frame that otherwise rots from the top down at every fastener.
- Buying wet pressure-treated lumber and fastening it tight. It shrinks. Gaps that were 1/8 inch become 3/8 inch and boards cup.
- Forgetting demolition. Tearing out and hauling an old deck typically runs $5 to $15 per square foot and is frequently quoted separately.
- No plan for what goes under the deck. Gravel, landscape fabric, or an under-deck drainage system is far cheaper to install before the boards go on.
These are national ranges, and decks vary more by site than almost any other project. The same 16 by 20 design can cost $9,000 on flat ground in a low-cost market with a 24-inch frost depth and $25,000 on a sloped lot in a high-wage metro where the posts run 10 feet to grade. Lumber pricing is also volatile enough that a quote more than 30 days old is a guess. Use these figures to build a realistic budget and to catch a missing line item, then get three on-site bids from licensed, insured local builders and let the written scope settle it.