Cost estimator
Deck Cost per Square Foot Calculator
Enter deck dimensions and material. See installed cost per square foot and total.
Cost estimator
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All measurements in feet
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National average
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These are ballpark figures based on national averages. Actual quotes vary with site access, season and contractor availability.
Updated: January 2026
What affects deck cost per square foot
The per-square-foot cost of a new deck moves on five levers, and each one can shift the number by 20% or more.
Material. Pressure-treated pine is the cheapest board on the market. Cedar is a small step up. Composite (wood-plastic capped boards) and capped PVC sit at the top of the range and carry the highest labor efficiency because the boards are uniform.
Deck size. Small decks (under 120 sq ft) cost 10% to 15% more per square foot because the crew, delivery and setup cost the same regardless. Very large decks (600+ sq ft) drop 5% to 10% per square foot for the same reason.
Height above grade. A ground-level deck (under 30 inches) needs no railing, which saves $25 to $60 per linear foot of perimeter. Elevated decks add railing, taller footings, and often stair runs — real cost.
Complexity. A rectangular deck with a single board direction is fastest. Angled boards, picture-frame borders, multi-level layouts, curves, and built-in benches all add hours per square foot.
Region. Labor is 40% to 60% of the total and swings 30% or more between the highest and lowest cost states.
Deck cost per square foot by material
Installed cost per square foot for a ground-level deck with basic railing built into the price. Labor and materials only.
| Option | Low | High | Unit |
|---|---|---|---|
Pressure-treated pine Cheapest board, needs staining every 2-3 years. | $15 | $29 | / sq ft |
Cedar Better looks, mid-range durability. | $19 | $35 | / sq ft |
Composite Capped wood-plastic composite, low maintenance. | $22 | $42 | / sq ft |
Capped PVC All-plastic, longest lifespan. | $25 | $48 | / sq ft |
The labor portion of a deck runs $10 to $20 per square foot regardless of material. On a pressure-treated deck that is roughly half the total; on a PVC deck the same labor is 30% to 40% of the total because the boards cost more.
Cost by common deck size
Total installed cost for a ground-level deck, pressure-treated boards with basic perimeter railing.
| Option | Low | High |
|---|---|---|
10 x 12 (120 sq ft) | $1,900 | $3,600 |
12 x 12 (144 sq ft) | $2,200 | $4,300 |
12 x 16 (192 sq ft) | $3,000 | $5,700 |
14 x 16 (224 sq ft) | $3,400 | $6,700 |
16 x 20 (320 sq ft) | $5,000 | $9,600 |
| Option | Low | High |
|---|---|---|
10 x 12 (120 sq ft) | $2,800 | $5,300 |
12 x 12 (144 sq ft) | $3,300 | $6,400 |
12 x 16 (192 sq ft) | $4,400 | $8,400 |
14 x 16 (224 sq ft) | $5,200 | $9,900 |
16 x 20 (320 sq ft) | $7,400 | $14,100 |
What is included in these estimates
The base ranges cover a ground-level deck on standard concrete footings, built by a licensed carpenter. Included:
- Deck boards, joists, beams, ledger board (if attached) and blocking.
- Fasteners: hidden clips for composite, stainless or coated screws for wood.
- Basic perimeter railing built into the material cost.
- Standard concrete footings (below frost line, sized for local code).
- Labor for layout, framing, board installation and cleanup.
- A 10% waste factor on materials.
Not included, add through the calculator's add-ons:
- Tear-out and disposal of an existing deck. Budget $3 to $8 per square foot.
- Elevated or code-compliant railing beyond the basic package. Add $25 to $60 per linear foot.
- Stairs. Each step run costs $150 to $400.
- Under-deck drainage systems, skirting or built-in benches.
- Electrical work: post lights, receptacles, low-voltage lighting.
- Permits over the base allowance.
How to compare deck quotes
Deck quotes vary widely because contractors bundle line items differently. A $9,500 quote and a $13,000 quote for the same deck usually reflect scope differences, not markup differences. Ask every bidder to itemize the same things.
Joist spacing. Composite decks need 16 inches on center or tighter — some capped PVC brands require 12 inches. If a contractor plans 24 inches on center for a composite deck, either the boards will sag or you will pay for a re-do. For wood, 16 inches is standard; 24 inches is acceptable but the deck feels less rigid.
Fastener type. Composite decks should use hidden clip fasteners from the board manufacturer (not third-party clips). Wood decks should use hot-dip galvanized or stainless screws — not plain deck screws that rust in 5 to 8 years.
Ledger flashing. The metal flashing between the ledger board and the house siding is what keeps water out. Should be aluminum or stainless, self-adhering, wrapping over the top of the ledger and extending 6 inches up under the siding. Cheap installs skip this and the wall rots inside 10 years.
Footings. Poured concrete footings below frost line (30 inches minimum in most of the US, 48 inches in the northern tier). Precast concrete blocks on grade are code-noncompliant in almost every jurisdiction, though they still show up in cheap quotes.
Railings and stairs. Are they in the base or add-ons? Which railing style — basic 2x2 balusters, aluminum, cable, or glass? Stairs itemized per step or per run?
Cleanup and disposal. For a replacement, is the old deck haul-off included? Dumpster fees can add $400 to $900 to a rebuild.
Written warranty. Materials warranty passes through from the manufacturer. Labor warranty is on the contractor — industry standard is 1 to 3 years. Anything less than 1 year is a red flag.
When it makes sense to DIY
A ground-level deck is a well-scoped DIY project for a homeowner with carpentry basics. Once the deck is more than 30 inches off grade, railing code kicks in and the project gets more serious. Rules of thumb:
- Ground-level, under 200 sq ft, rectangular, pressure-treated boards: worth trying with a helper and two to three weekends.
- 200 to 400 sq ft, ground-level, pressure-treated or composite: borderline. Rent a miter saw stand and a framing nailer. Plan three to four weekends.
- Any deck over 30 inches high: hire a pro unless you have built railings before.
- Multi-level, curved, or attached to an upstairs door: hire a pro. Ledger and header design are life-safety work.
DIY savings on a ground-level pressure-treated 12x16 deck are $1,500 to $2,500 — about 40% to 50% of the installed cost. In composite the savings drop to 25% to 30% because materials are a bigger share of the total.
Frequently asked questions
What is the average cost to build a deck per square foot?
Pressure-treated pine decks run $15 to $29 per square foot installed. Cedar lands at $19 to $35. Composite runs $22 to $42, and capped PVC $25 to $48. Labor alone is $10 to $20 per square foot regardless of material.
How much of the cost is labor?
Labor is roughly 40% to 60% of a deck build. Simple rectangular ground-level decks lean toward the lower end. Multi-level decks, decks over 8 feet off grade, and any deck with curves or angled boards push labor above 60%.
How much does a 12x16 deck cost?
A 12x16 deck (192 sq ft) in pressure-treated lumber runs about $2,900 to $5,600 with basic railing. In composite the same size runs $4,200 to $8,100. Stairs and tear-out are additional.
What size deck do most homeowners build?
The most common backyard deck sizes are 12x12 (144 sq ft), 12x16 (192 sq ft) and 16x20 (320 sq ft). The 12x16 is the sweet spot — it fits a dining table plus a small sitting area without dominating a typical backyard.
Does deck size affect price per square foot?
Slightly. Small decks (under 120 sq ft) run 10% to 15% higher per square foot because the crew, delivery and setup cost the same regardless. Very large decks (600+ sq ft) drop 5% to 10% per square foot for the same reason.
Are railings and stairs included in the per-square-foot price?
A basic pressure-treated railing on the deck perimeter is usually included. Elevated railings, cable rail, decorative balusters and stairs are add-ons. Use the checkboxes in the calculator to add them and see how each line item moves the total.
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