On AllBetter
Need a landscaper?
Post the job free and compare bids from identity-verified local pros — payment held in escrow until the work is done right.
Find a landscaper near you →Get three quotes for the same deck and you can easily see an $8,000 bid next to a $22,000 one — same footprint, all licensed contractors, none of them wrong. The spread is real, and it comes down to material, railings, stairs, and whether demolition of the old deck is in the number. This guide breaks down what deck building actually costs in 2026 so you can compare quotes on scope, not just price.
How much does it cost to build a deck? A new deck costs $7,000–$15,000 for a standard 300 sq ft deck in 2026, averaging around $10,500 — or $30–$60 per square foot installed. Pressure-treated wood is the budget end; composite and hardwood run higher. A small pressure-treated deck can start near $4,000; a large composite deck with railings and stairs can pass $25,000.
Deck Building Cost by Material
Material is the single biggest variable. The difference between pressure-treated pine and exotic hardwood can triple the budget on the same footprint:
Pressure-treated wood is cheapest upfront but needs staining or sealing every 2–3 years ($200–$500 a year). Composite and PVC cost more to install but never need refinishing — just an annual wash — so over 20 years they often land at a similar total cost to wood.
Total Deck Cost by Size
On AllBetter
Ready to get it done?
Fund escrow before work starts. Release payment when you approve the finished work.
Find a landscaper near you →Size multiplies the per-square-foot price into your real budget. Typical 2026 fully installed costs (materials plus labor, standard railings and footings):
These ranges do not include demolition of an existing deck, stairs, or premium add-ons. A multi-level deck adds roughly 20–40% over a single level of the same footprint — each tier needs its own posts, footings, and railing runs.
Labor Costs for Deck Building
Labor is 40–60% of the total — framing, footings, ledger-board attachment, joist layout, decking, railings, and stairs. What drives the rate:
- Ground-level deck: $15–$22/sq ft — the simplest build, 2–4 days for 300 sq ft.
- Elevated deck (4–8 ft): $22–$30/sq ft — deeper footings, taller posts, more bracing.
- Multi-level or complex design: $25–$35/sq ft — angles, curves, and transitions each add framing labor.
Deck Add-On Costs
The base price rarely tells the whole story — add-ons can raise the total 30–50%:
- Railings — $20–$60 per linear foot. Wood at the low end, cable or glass at the high end. Code-required for any deck 30 inches or more above grade.
- Stairs — $50–$125 per step. A 4-step staircase runs $200–$500; a landing adds $500–$1,500.
- Built-in seating — $500–$2,000. Perimeter benches at the low end, L-shaped seating higher.
- Pergola — $2,000–$6,000. Wood cheaper, vinyl or aluminum higher.
- Deck lighting — $500–$3,000. Post-cap lights to a full low-voltage riser-and-rail system — cheapest to wire during the build.
- Old-deck demolition — $1,000–$3,500. Always confirm whether this is in the quote.
What Affects Your Deck Building Cost
Watch: what actually moves a deck price (48 seconds).
- Height and elevation. Every foot up adds longer posts, deeper footings, and bracing — an 8-foot elevated deck costs 30–50% more than ground level.
- Design complexity. Rectangles are cheapest; angles, curves, and wraparounds add 5–15% each in cuts, waste, and labor.
- Permits. $100–$500, required in most areas for decks over 200 sq ft or 30 inches above grade. The contractor should pull it — if one suggests skipping it, walk away.
- Site preparation. Rocky or clay soil, a sloped yard, or tree-root removal can add $500–$3,000 before any decking goes down. Clearing the deck footprint may also mean tree removal.
- Region and season. Costs vary 20–40% by region; booking in late fall or winter can save 10–15% on labor.
DIY vs. Professional Deck Building
Building it yourself can save 40–50% on labor — with real trade-offs. DIY makes sense for a simple ground-level deck under 200 sq ft in pressure-treated wood (materials $3,000–$5,000, three to five weekends of work). Where it gets risky: elevated decks, ledger-board attachment (improper attachment is the leading cause of deck collapses), and footing depth and spacing — a structural failure is a safety hazard, not just a cost. A common middle ground is to have a contractor do the structural work (footings, framing, ledger) and install the decking boards and railings yourself.
A deck is also one of the stronger outdoor projects for resale value — it consistently ranks among the better-recouping home improvements, with pressure-treated wood usually returning a higher percentage than composite because of its lower upfront cost. Build to the neighborhood standard; over-building with exotic hardwood on a street of pressure-treated decks rarely recoups the premium.
How to Spot an Honest Deck Builder
The builder matters as much as the material. Compare quotes against these signals:
Lead-generation sites like Angi and Thumbtack charge contractors per lead, and that cost is built into your quote. On a marketplace with a pay-when-you-win bidding model, identity-verified builders bid your job directly and payment is held in escrow until the deck passes inspection. Doing the project alongside a fence installation? Bundling outdoor work into one visit can trim setup costs.
Deck Building Cost FAQ
How much does it cost to build a 12×20 deck?
A 12×20 deck (240 sq ft) costs $5,500–$12,000 installed in 2026. Pressure-treated wood runs $5,500–$8,000; composite runs $8,000–$12,000. These prices include standard railings and footings but not stairs, demolition, or premium features — add $1,000–$3,000 for those.
Is composite decking worth the extra cost over wood?
Composite costs 40–60% more upfront than pressure-treated wood, but it eliminates $200–$500 a year in staining and sealing. Over 20 years it often costs the same or less than wood once maintenance is counted, and it will not splinter, rot, or warp. If you plan to stay 7+ years, composite usually pays for itself.
How long does it take to build a deck?
A standard 300 sq ft single-level deck takes 3–5 days for a professional crew; multi-level or complex designs take 7–14 days. Add 1–2 days to demolish an old deck, and 1–4 weeks for permit approval before construction starts.
Do I need a permit to build a deck?
Most municipalities require a building permit for decks over 200 sq ft or 30 inches above grade. Permits run $100–$500 and ensure the deck meets code for footings, ledger attachment, and railing height. Your contractor should handle the application and inspections — building without a permit risks fines and problems when you sell.
What is the cheapest type of deck to build?
Pressure-treated pine is the cheapest material at $15–$25 per square foot. A basic 200 sq ft ground-level pressure-treated deck costs $4,000–$7,000 fully installed. To cut cost further: choose a simple rectangle, skip built-in features, use standard balusters, and build in the off-season.
How much does deck maintenance cost per year?
Wood deck maintenance runs $200–$500 a year for staining, sealing, and minor repairs — pressure-treated and cedar need refinishing every 2–3 years. Composite and PVC cost $50–$100 a year, just an annual wash. Over 20 years, maintenance adds $4,000–$10,000 to the cost of owning a wood deck.
