How much does a new deck cost per square foot?

A new deck costs $15-$35 per square foot for pressure-treated wood, $30-$60 for composite decking, and $40-$75+ for hardwood (ipe, mahogany) in 2025. These prices include materials, framing, and labor. Elevated decks with stairs and railings cost more than ground-level platforms.

Is composite decking worth the extra cost?

Composite decking costs 2-3x more than pressure-treated wood upfront but requires no staining, sealing, or painting. Over 20 years, composite saves $2,000-$5,000 in maintenance. It also will not splinter, warp, or rot. Best value for decks you plan to keep 10+ years.

Do I need a permit to build a deck?

Most jurisdictions require a permit for decks over 200 sq ft or more than 30 inches above grade. Permits cost $100-$500 and require an inspection. Attached decks must meet ledger board and flashing requirements. Free-standing ground-level decks under 200 sq ft may be exempt.

How long does it take to build a deck?

A professional crew can build a standard 300 sq ft deck in 3-5 days. Complex multi-level decks take 1-2 weeks. DIY deck projects typically take 2-4 weekends. Factor in 1-2 weeks for permit approval before starting construction.

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Assumptions & Sources

Assumptions

Decking pricing: Based on 2025-2026 national averages for materials delivered.
Labor rates: $8-20/sq ft depending on material and complexity.
Waste factor: 10% standard, 15-25% for diagonal/patterns.
Footings: One per 64 sq ft (8x8 grid) plus corners.
Railing: Required by code for decks over 30" above grade.

Last updated: February 2026

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