How Much Does It Cost to Build a Deck? (2026 Guide)
A finished wood deck runs about $20–45/sq ft and composite about $30–60/sq ft installed: a 12×16 (192 sq ft) wood deck lands roughly $4,000–8,600.
Deck cost per square foot, by material
Decking material is the biggest single swing factor in the estimate. The installed ranges below include boards, the joist platform, fasteners and labor for a straightforward ground-level build at typical 2026 U.S. pricing; high-cost metros run higher.
| Decking material | Typical installed cost per sq ft |
|---|---|
| Pressure-treated pine | $20–35 |
| Cedar or redwood | $25–40 |
| Composite | $35–60 |
What the rate includes. These are finished-installation numbers, so labor is inside them — often close to half the quote — along with the joist platform underneath. Framing is not where you want to cut corners: composite boards usually need joists on 12-in centers instead of 16 in.
Where railings and stairs fit. Railing and stairways rarely ride inside the per-square-foot rate — they are quoted per linear foot and per step or flight. Averaged across the whole project, wood decks typically finish at $20–45/sq ft and composite at $30–60/sq ft.
What a deck costs at common sizes
Multiply your planned footprint by the finished ranges above — wood about $20–45/sq ft, composite about $30–60/sq ft:
| Deck size (ft) | Deck area | Wood (finished project) | Composite (finished project) |
|---|---|---|---|
| 10 × 12 | 120 sq ft | $2,400–5,400 | $3,600–7,200 |
| 12 × 16 | 192 sq ft | $4,000–8,600 | $5,800–11,500 |
| 16 × 20 | 320 sq ft | $6,400–14,400 | $9,600–19,200 |
The per-square-foot rate drops as the footprint grows — bigger decks spread fixed costs like permits and delivery thinner. Most jurisdictions also require a permit once a deck is attached to the house.
What affects the final price
- Height and access. A low, ground-level deck is the cheapest to frame — minimal footings and no stairs. Each extra level of elevation adds stair runs and bigger footings.
- Ground conditions. Sloping lots, roots, ledge rock or poor drainage make footings and site prep a bigger line item than the deck; demo adds more when replacing an old deck or concrete pad.
- Railing. Quoted per linear foot, railing quickly rivals the boards in cost — basic wood is cheapest, while composite, aluminum and glass systems push a project toward the top of its range.
- Stairs. Each stairway is priced separately — per step plus landing, with its own footings and railing — so a deck with two stairways costs more than the same footprint with one.
- Stain, paint or seal. Pressure-treated wood and cedar need a stain or sealer within weeks of building and every couple of years; composite never needs painting or staining. Finishing is easy DIY — size the job with the fence stain calculator before buying gallons.
Three tips for a fair deck price
- Get three itemized quotes. Ask each contractor to price the deck as a per-square-foot rate with separate line items for railing and stairs, stating what is included — permits, demo, disposal. A lump-sum quote hides where the money goes.
- Respect the substructure budget. The joist platform and the railing together are often as much as the decking boards. Cutting joist lumber, hangers or footings to afford nicer boards is a false economy — a weak frame fails first, and re-framing means tearing out the decking you paid for.
- DIY saves labor, not materials. Building it yourself keeps the labor share of the quote — often a third to a half — but boards, fasteners and stain cost the same either way, and a framing mistake is on you. A common middle path is hiring out the framing and DIY the staining, railing and demo.
Planning the lumber before you price it? Figure out how many deck boards you need for your footprint first, or estimate the run of material for a 24×24 garage if that is also on the list.
FAQ
How much does a 12×16 wood deck cost?
A 12×16 deck covers 192 sq ft. At $20–45 per sq ft finished, a wood deck runs roughly $4,000–8,600 — pressure-treated pine at ground level near the low end, up to cedar or redwood with stairs or a taller platform. Composite runs about $5,800–11,500.
How much more does a composite deck cost than wood?
Roughly 30–50% more up front: wood finishes around $20–45 per sq ft installed and composite around $30–60, so a 12×16 runs about $4,000–8,600 in wood versus $5,800–11,500 in composite. Composite never needs staining or painting and can cost less over a decade.
How much can I save by building the deck myself?
Usually a third to a half of the contractor's quote — labor is that large a share, but you save the labor, not the materials. Boards, fasteners and stain cost the same either way, and a framing mistake is on you. Pay a pro for the framing and DIY the staining, railing and demo.
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