Deck construction costs in 2026 range from $5,500 for a small pressure-treated wood deck to $35,000+ for a large composite deck with built-in features. The average 400 sq ft deck runs $12,000–$22,000 installed. Material choice is the primary cost driver: composite decking costs 50–75% more than pressure-treated wood upfront but requires significantly less maintenance over its lifespan.
Pressure-treated lumber remains the most common deck material due to its relatively low cost and proven performance. A 400 sq ft PT wood deck runs $10,000–$16,000 installed. PT wood requires annual maintenance — cleaning, staining or sealing every 2–3 years — and typical lifespan is 15–25 years with proper care. Lumber prices have moderated from their 2021–2022 peak but remain 25–30% above 2019 levels.
Composite decking (Trex, TimberTech, Fiberon) has captured a growing share of the market, now representing approximately 35% of new deck builds. The higher upfront cost ($16,000–$28,000 for a 400 sq ft deck) is offset by dramatically lower maintenance — composite requires only periodic cleaning with soap and water, no staining or sealing. Quality composites carry 25–30 year fade and stain warranties.
Tropical hardwoods (Ipe, Cumaru, Tigerwood) and domestic hardwoods (Redwood, Cedar) represent the premium natural wood option. Ipe is among the most durable deck materials available — properly maintained, it lasts 40–75 years. Sustainability certification (FSC) is important to verify for tropical species. Hardwood installation requires specialised tools and expertise, adding to labour costs.
Virtually all jurisdictions require a permit for new deck construction and most deck replacements — particularly if the deck is attached to the house, elevated more than 30 inches above grade, or exceeds a certain square footage (commonly 200 sq ft). Permit costs vary widely: $150–$800 in most jurisdictions. Some areas require engineering drawings for elevated decks, adding $500–$1,500 to the permit process.
Unpermitted decks create significant problems at resale. Buyers' inspectors flag unpermitted structures, and lenders may require removal or remediation as a condition of financing. Always verify permit status before hiring a contractor — and be wary of contractors who suggest skipping the permit process.
Built-in benches add $1,500–$4,000; pergolas or shade structures $3,500–$12,000; outdoor kitchens $8,000–$30,000+; lighting systems $1,200–$4,000; stairs (every 4 ft of rise adds a run of steps) $1,500–$4,000. Multi-level decks add 20–35% over a single-level equivalent. Structural requirements for elevated decks — deeper footings, heavier posts and beams — can add $3,000–$8,000 for decks 6+ feet above grade.