Building a new deck is one of the most popular home improvement projects, adding outdoor living space and significant value to a home.
In 2026, the cost to build a deck typically ranges from $15 to $35 per square foot for pressure-treated wood, $25 to $50 per square foot for composite decking, and $30 to $60+ for premium materials like hardwood or PVC.
A 300–400 square foot deck (a common size) thus costs $5,000–$25,000 fully installed.
Deck construction is often combined with other exterior improvements — the cost to paint a house exterior of $2,500–$8,000 is frequently completed at the same time to refresh the home's appearance alongside a new deck installation.
This guide breaks down deck construction costs, materials, and factors that affect pricing.
Deck Cost by Material
Pressure-treated lumber is the most affordable option at $15–$25/sq ft installed. Cedar and redwood run $20–$35/sq ft. Composite decking (brands like Trex, TimberTech) costs $25–$50/sq ft but requires less maintenance.
Hardwood (ipe, teak) costs $30–$60+/sq ft. PVC/vinyl decking runs $25–$45/sq ft. Material choice significantly affects both upfront cost and long-term maintenance expenses.
For comparison, the cost to build a garage at $50–$80/sq ft illustrates how outdoor structures like decks are among the more cost-effective ways to add usable space to a property.
Deck Size and Scope Factors
A basic 10×10 ft deck (100 sq ft) costs $3,000–$7,500. A 20×20 ft deck (400 sq ft) runs $8,000–$25,000. Elevated decks requiring footings and taller posts add $1,500–$5,000 vs. ground-level decks.
Second-story or roof decks are more expensive due to structural requirements.
Railings, stairs, and built-in seating add $2,000–$10,000+.
Homeowners considering deck construction should also evaluate whether a basement finishing project of $25,000–$75,000 would add more livable space per dollar compared to an outdoor deck, particularly in colder climates where outdoor use is seasonal.
Permits and Regulations
Most jurisdictions require permits for deck construction, particularly for attached or elevated decks. Permit costs typically run $500–$2,000. Permits ensure structural safety and protect homeowners at resale.
Unpermitted decks can cause complications with homeowners insurance and home sales — a buyer's home inspection may flag an unpermitted deck, potentially requiring it to be removed or brought up to code before closing.
A home appraisal after a permitted deck installation can help document the value added to the property.
Frequently Asked Questions
How much does it cost to build a 12x12 deck?
A 12×12 ft deck (144 sq ft) typically costs $4,000–$8,000 for pressure-treated wood and $7,000–$15,000 for composite decking, fully installed.
For homeowners financing the project, understanding how loan amortization works helps evaluate whether a home equity loan or personal loan is the right vehicle for funding deck construction.
Is it cheaper to build your own deck?
DIY deck construction can save 30–50% on labor.
However, permits, inspections, and structural requirements make professional involvement important for elevated or attached decks.
If you are a homeowner who recently purchased the property, a home inspection report can also identify any structural issues that should be addressed before adding a deck to the home's exterior.
How much does composite decking cost vs wood?
Composite decking costs 50–100% more upfront than pressure-treated lumber but requires significantly less ongoing maintenance (no staining, less warping) over its lifespan.
Does a deck add value to a home?
Decks typically return 55–75% of their construction cost in increased home value, with higher returns in markets where outdoor living is valued.
Getting a home appraisal after completing the deck documents the value added and can support a refinance or home equity loan at an updated property value.
Pairing a deck with other exterior upgrades like a new roof maximizes overall curb appeal and resale value simultaneously.
What permits are needed to build a deck?
Most jurisdictions require a building permit for attached decks over a certain height or size.
Contact your local building department before starting construction.
Unpermitted decks create complications when selling a home — a buyer's home inspection will typically identify the deck, and the lender's appraisal may not give full credit for an unpermitted structure, making the permit an important investment that protects future resale value.
Sources & References
- U.S. Census Bureau — residential construction data — https://www.census.gov/construction/
- National Association of Realtors — home remodeling impact study — https://www.nar.realtor/
- U.S. Department of Housing and Urban Development — home improvement guidance — https://www.hud.gov/
- Consumer Financial Protection Bureau — home improvement financing — https://www.consumerfinance.gov/
Last updated: April 27, 2026