Construction estimator · Updated June 2026
Deck Construction Cost Estimator
Get a free deck construction cost estimate before calling a contractor. Select your deck size, material, height and location to calculate deck construction cost based on real 2026 US contractor rates.
Enter your deck details
Select your deck details
Enter your deck size and make your selections to get an instant cost estimate.
- Most 400 sq ft composite decks cost $15,000–$22,000 installed
- Pressure treated wood is 40–50% cheaper than composite upfront
- Elevated decks cost 15–35% more than ground level
- Railings and stairs are the largest add-on costs
What affects deck construction cost?
- Material — The single biggest variable. Composite decking costs 2–3x more than pressure treated wood upfront but requires virtually no maintenance.
- Size — Cost per square foot typically decreases slightly on larger decks due to fixed mobilization costs.
- Height — Elevated decks require taller posts, more structural framing and additional footings, adding 15–35% to base cost.
- Railings — Required by code on decks over 30 inches high. Cable and aluminum railings cost significantly more than wood.
- Location — Labor rates vary up to 30% between rural Midwest and major coastal metro areas.
- Permits — Most jurisdictions require a building permit for new deck construction. Budget $400–$1,200 for permit and inspection fees.
How much does deck construction cost in 2026?
The average deck construction cost in 2026 ranges from $15 to $50 per square foot installed, depending on material, height, location and features. A standard 400 sq ft pressure treated wood deck costs between $6,000 and $10,000. The same deck built with mid-grade composite decking costs $14,000 to $20,000. Our free deck construction cost estimator calculates your estimate instantly based on your specific selections and US state.
The deck construction cost estimate above uses 2026 US contractor rate data adjusted for your state and area type — rural, suburban or major metro — giving you a more accurate local estimate than a national average alone.
Deck construction cost calculator — by material
Use our deck construction cost calculator to compare materials side by side. Material choice is the biggest cost variable in any deck build — here is how each option compares for a standard 400 sq ft elevated deck with wood railings in an average US market:
| Material | Cost per sq ft | 300 sq ft deck | 400 sq ft deck | 600 sq ft deck | Lifespan |
|---|---|---|---|---|---|
| Pressure Treated Wood | $15–$25 | $4,500–$7,500 | $6,000–$10,000 | $9,000–$15,000 | 15–20 years |
| Cedar / Redwood | $20–$35 | $6,000–$10,500 | $8,000–$14,000 | $12,000–$21,000 | 20–25 years |
| Composite Mid-grade | $25–$40 | $7,500–$12,000 | $10,000–$16,000 | $15,000–$24,000 | 25–30 years |
| Composite Premium | $35–$50 | $10,500–$15,000 | $14,000–$20,000 | $21,000–$30,000 | 30+ years |
| Exotic Hardwood | $40–$60 | $12,000–$18,000 | $16,000–$24,000 | $24,000–$36,000 | 40–75 years |
Cost estimate for deck construction — what is included?
Our deck construction cost estimate includes all standard components of a new deck build:
- Footings and posts — Concrete footings drilled below frost line, pressure treated posts
- Framing — Ledger board attachment to house, beam and joist framing, blocking
- Decking boards — Your selected material, cut and installed with appropriate fasteners
- Labor — All construction labor, typically 40–50% of total deck cost
- Flashing and waterproofing — Ledger flashing, joist tape where applicable
The estimate does not include demolition of an existing deck (add $800–$2,500), landscaping restoration around footings, or any structural repairs to the home where the ledger attaches.
Deck construction cost estimates by size
| Deck size | Pressure treated | Composite mid | Composite premium |
|---|---|---|---|
| 10×10 ft (100 sq ft) | $2,000–$3,500 | $3,500–$5,500 | $5,000–$7,500 |
| 12×16 ft (192 sq ft) | $3,800–$6,200 | $6,500–$10,000 | $9,000–$13,500 |
| 16×20 ft (320 sq ft) | $6,000–$9,500 | $10,500–$16,000 | $14,500–$21,000 |
| 20×20 ft (400 sq ft) | $7,500–$12,000 | $13,000–$19,500 | $18,000–$26,000 |
| 20×30 ft (600 sq ft) | $11,000–$17,500 | $19,000–$28,500 | $26,000–$38,000 |
Deck railing and stairs cost
Railings and stairs are the largest add-on costs in any deck construction project. Here is what to budget:
| Feature | Low estimate | Mid estimate | High estimate |
|---|---|---|---|
| Wood railings (per linear ft) | $25 | $35 | $50 |
| Composite railings (per linear ft) | $45 | $60 | $85 |
| Aluminum / cable railings (per linear ft) | $65 | $90 | $130 |
| Single stair section (3–4 steps) | $900 | $1,200 | $1,800 |
| Full staircase (8–12 steps) | $1,800 | $2,800 | $4,500 |
| Pergola (attached, standard) | $8,000 | $12,000 | $18,000 |
Frequently asked questions
How much does it cost to build a deck in 2026?
The average cost to build a deck in 2026 is $15–$50 per square foot installed, depending on material and location. A 400 sq ft pressure treated deck costs approximately $6,000–$10,000. The same size composite deck costs $13,000–$20,000. Use our deck construction cost estimator above for a personalized estimate based on your state and area type.
What is the deck construction cost estimate for a 20x20 deck?
A 20×20 foot deck (400 sq ft) costs between $6,000 and $26,000 depending on material. Pressure treated wood runs $6,000–$12,000 installed. Mid-grade composite runs $13,000–$20,000. Premium composite or hardwood runs $18,000–$26,000. Add railings ($2,000–$4,000), stairs ($1,200–$1,800 per section) and a permit ($400–$800) to your total.
Is composite decking worth the extra cost?
Composite decking costs 2–3x more upfront than pressure treated wood but requires no staining, sealing or significant maintenance. Over a 25-year period, the total cost of ownership for composite decking is often lower than wood when maintenance costs are factored in. Composite also holds its appearance better and has higher resale appeal. For a deck you plan to keep long-term, composite is generally worth the additional upfront investment.
Do I need a permit for deck construction?
Yes, in most US jurisdictions a building permit is required for any new deck construction, especially decks attached to the home or elevated more than 30 inches above grade. Permit costs typically range from $400 to $1,200 depending on your municipality and deck size. Building without a permit can create issues when selling your home and may result in fines or required demolition.
How do I get a deck construction cost estimate?
The fastest way to estimate deck construction cost is to use our free deck construction cost estimator above — enter your deck size, select your material, height, railings, features and US state for an instant estimate. For a formal project quote, contact at least 3 licensed deck contractors in your area. Most provide free on-site estimates.
More free estimators
Explore more home cost estimators
Free cost estimators for every home improvement project — updated for 2026, no signup required.
Disclaimer: All deck construction cost estimates are for informational purposes only based on average 2026 US contractor rates. Actual costs vary based on site conditions, soil type, local building codes, permit requirements and contractor availability. Always obtain multiple quotes from licensed, insured deck contractors before proceeding with any construction project.