Deck Cost Calculator
Estimate the full cost to build a deck in 2026 — materials, contractor labor, foundation, railings, stairs, and permits — with a DIY vs pro comparison, resale ROI, and build timeline.
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Your deck
Defaults reflect 2024–2026 U.S. national averages. Adjust any number to match a contractor quote.
How this deck cost estimator works
The estimate follows one transparent formula:
Total = (area × material $/sq ft × style multiplier × region multiplier) + railings + stairs + permit + demolition + skirting + lighting
Material installed rates (ground-level, average region): pressure-treated pine $35/sq ft, cedar $42/sq ft, composite $47/sq ft, PVC $58/sq ft. Wondering how much does a Trex deck cost? Trex is a composite brand, so read the composite column — how much is a composite deck of 320 sq ft? About $15,040 for the structure before railings and stairs.
Style multipliers reflect real structural differences: ground-level 1.00×, raised 1.30× (deeper footings, taller posts, mandatory railings and stairs), multi-level 1.55×, rooftop 1.70× (pedestal systems, membrane protection, difficult access). A multi level deck cost benchmark: the 20×24 cedar multi-level in worked example 3 totals $52,685 pro-installed. A rooftop deck cost benchmark: the 10×12 PVC rooftop in worked example 4 totals $16,884. The DIY column prices materials only — roughly $13/sq ft for pressure-treated, $17 cedar, $22 composite, $27 PVC, plus 10% cutting waste — so the gap between the two columns is the deck labor cost you avoid: contractor labor, overhead, and margin, roughly 45–62% of a pro quote depending on deck style and material.
National average deck cost 2024–2026 (deck structure, installed)
Deck structure only — ground-level, average-cost region, before railings, stairs, and permits. All figures computed by this tool's engine:
| Deck size | Pressure-treated | Cedar | Composite | PVC |
|---|---|---|---|---|
| 10×10 (100 sq ft) | $3,500 | $4,200 | $4,700 | $5,800 |
| 12×16 (192 sq ft) | $6,720 | $8,064 | $9,024 | $11,136 |
| 12×20 (240 sq ft) | $8,400 | $10,080 | $11,280 | $13,920 |
| 16×20 (320 sq ft) | $11,200 | $13,440 | $15,040 | $18,560 |
| 20×20 (400 sq ft) | $14,000 | $16,800 | $18,800 | $23,200 |
These sit inside published 2026 national ranges (Angi: $30–$60/sq ft installed overall; pressure-treated installs averaging ~$40/sq ft). Real quotes vary with site access, soil, and lumber grade.
Worked examples (computed by the engine)
1. Budget DIY: 12×16 pressure-treated, ground-level
192 sq ft. Pro-installed: $9,182 ($47.82/sq ft) including 44 ft of railing and a $350 permit. DIY materials: $4,257.20 ($22.17/sq ft) — you keep $4,924.80. Realistic quote range: $5,809.60–$12,554.40. Timeline: ~6 pro days or 3 DIY weekends.
2. Family upgrade: 16×20 composite, raised, pro-installed
320 sq ft, 56 ft of composite railing, one stair flight, 4 light fixtures, $450 permit. Total: $25,540 ($79.81/sq ft); DIY would be $13,548.60. Resale value added: ~$12,310.28 at a 48.2% recoup rate. Timeline: ~7 pro days or 4 DIY weekends.
3. Premium rebuild: 20×24 cedar multi-level, high-cost region
480 sq ft with demolition of the old deck ($4,800), 68 ft of railing, two stair flights, 88 ft of skirting, 6 lights, $600 permit. Total: $52,685 ($109.76/sq ft); DIY materials $20,238.30. Timeline: ~8 pro days or 6 DIY weekends.
4. Rooftop: 10×12 PVC, pro-installed
120 sq ft, 34 ft of railing, one stair flight, 2 lights, $800 permit (rooftop permits run higher). Total: $16,884 ($140.70/sq ft); DIY $9,156.40 — though rooftop structural and waterproofing work is rarely a DIY job.
Where the money goes
For a typical pro build the calculator splits your total roughly as: deck foundation cost (concrete piers/footings) ~10%, framing and structure ~20%, decking surface boards ~28%, fasteners and hardware ~2%, railings and stairs at their computed cost, permit as a flat fee, demolition if replacing, and contractor labor as the remainder (roughly 10–17% in our worked examples — materials, railing, and stairs make up the bulk, so labor is the smaller residual). Deck installation cost quotes that come in far below these shares usually mean thinner framing or skipped flashing — ask what is included.
Material comparison
| Material | Installed $/sq ft | DIY materials $/sq ft | Typical lifespan | Resale recoup |
|---|---|---|---|---|
| Pressure-treated pine | $35 | $13 | 10–15 years | 50.2% |
| Cedar | $42 | $17 | 15–20 years | 55% |
| Composite | $47 | $22 | 25–30 years | 48.2% |
| PVC / vinyl | $58 | $27 | 30–50 years | 48% |
Pressure treated deck cost stays the lowest up front but needs staining every 2–3 years; cedar deck cost buys natural rot resistance; composite deck cost (this composite deck cost calculator's most-used mode) trades higher upfront cost for near-zero maintenance; pvc deck cost is highest but lasts the longest. The deck ROI column uses Remodeling Cost vs. Value benchmarks.
Ground level deck cost is the baseline — every style multiplier above compounds on these rates. Use this page as a deck cost estimator for budgeting, then confirm with at least three local quotes; structural details (ledger attachment, footings below the frost line) must follow your local building code.
Frequently asked questions
How much does a deck cost?
In 2026, a professionally installed deck costs roughly $30 to $60 per square foot (Angi national data), so a typical 320 sq ft deck lands around $11,200 to $18,560 for the deck structure alone, and $14,000 to $26,000 once railings, stairs, and permits are included. This calculator's national table puts a 320 sq ft pressure-treated deck at $11,200, cedar at $13,440, composite at $15,040, and PVC at $18,560 before extras.
What is the average cost of a deck per square foot?
Installed cost per square foot in this tool's model: pressure-treated pine $35, cedar $42, composite $47, and PVC $58 for a ground-level build in an average-cost region. Once you add railings ($48-$88 per linear foot), stairs ($475-$1,150 per flight), and permits, real project totals usually land between $30 and $140 per square foot depending on material and deck style.
How much does a 12x16 deck cost?
A 12x16 deck is 192 sq ft. With pressure-treated pine, ground-level, pro-installed, this calculator estimates $9,182 total ($47.82 per sq ft), including 44 linear feet of railing and a $350 permit. DIY with materials only: $4,257.20 ($22.17 per sq ft). The deck structure alone averages $6,720 for pressure-treated, $8,064 cedar, $9,024 composite, or $11,136 PVC.
How much does a 16x20 deck cost?
A 16x20 deck is 320 sq ft. Deck structure only: $11,200 pressure-treated, $13,440 cedar, $15,040 composite, $18,560 PVC. A full worked example - 16x20 composite, raised 4-8 ft, pro-installed with 56 ft of railing, one stair flight, 4 light fixtures and a $450 permit - totals $25,540 ($79.81 per sq ft), DIY $13,548.60.
What is the cost of a 20x20 deck?
A 20x20 deck is 400 sq ft. Deck structure only in this model: $14,000 pressure-treated pine, $16,800 cedar, $18,800 composite, $23,200 PVC. Add about $2,880-$5,280 for railings (60 linear feet around three sides), $475-$1,150 per stair flight, and $150-$1,000 for the permit to get the full project number.
DIY deck cost vs contractor: how much do I really save?
For a 12x16 pressure-treated deck, DIY materials cost $4,257.20 versus $9,182 pro-installed - you keep $4,924.80. For a 16x20 raised composite deck, DIY is $13,548.60 versus $25,540 pro - a $11,991.40 saving. The gap is contractor labor, overhead, and margin (roughly 45-62% of a pro quote, depending on deck style and material). DIY only pays off if you own the tools, can spare 3-6 weekends, and are comfortable with structural work like footings and ledger attachment.
How much more does a raised deck cost than a ground-level deck?
A raised deck (4-8 ft off the ground) costs about 1.30x a ground-level deck of the same size in this model, because of deeper footings, taller posts, mandatory railings, and stairs. Multi-level decks run about 1.55x and rooftop decks about 1.70x. Example: a 16x20 composite deck is $15,040 as a ground-level structure but the raised version with railing and stairs totals $25,540 pro-installed.
How much does a deck permit cost?
Budget $150 to $1,000 for a deck permit; this calculator defaults to $350. Ground-level decks under 30 inches high sometimes escape permits, but raised, multi-level, and rooftop decks almost always require one plus inspections. The permit line in the estimate is a flat fee that applies equally to DIY and pro builds.
What is the deck railing cost per linear foot?
Installed railing runs about $48 per linear foot for pressure-treated, $58 for cedar, $78 for composite, and $88 for PVC in an average-cost region. A typical 16x20 deck needs about 56 linear feet (three sides minus the house side), so $2,688 to $4,928 just for railings. DIY builders pay roughly 55% of that for materials alone.
How much do deck stairs cost?
One flight of deck stairs costs about $475 installed for pressure-treated, $625 for cedar, $950 for composite, and $1,150 for PVC. Raised decks need at least one flight; multi-level designs need two or more. DIY builders spend roughly half the installed price on stair materials.
What is the ROI and resale value of a deck?
A new deck recoups roughly half its cost at resale: about 50.2% for pressure-treated wood, 55% for cedar, 48.2% for composite, and 48% for PVC (Remodeling Cost vs. Value benchmarks). On the $25,540 composite example above, that is about $12,310.28 in added home value. Decks costing more than ~5% of your home's value rarely pay back proportionally, so use the home-value check in the calculator before upgrading materials.
How long does it take to build a deck?
A pro crew typically needs about 6 days for a 192 sq ft deck and 8 days for a 480 sq ft deck, plus a few days of design and permit buffer - roughly 1-2 weeks door to door. A skilled DIYer working weekends needs about 3 weekends for 192 sq ft and 6 weekends for 480 sq ft. Rooftop and multi-level builds add time for access constraints and extra inspections.
What is the cheapest way to build a deck?
The cheapest legitimate deck is ground-level, pressure-treated pine, simple rectangle, DIY: materials for a 12x16 run about $2,745.60 for the deck structure (192 sq ft at $13 per sq ft plus 10% waste). Skipping railings is only legal for decks under 30 inches high - never skip railings on a raised deck to save money. The next-biggest savings are a simple shape (no curves or multi-levels) and reusing an existing ledger and footings if an engineer approves them.
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