Deck Cost Calculator

Building a deck costs $15–$45 per square foot on average. Pressure-treated wood runs $11–$18/sq ft, composite decking $18–$30/sq ft, and exotic hardwood $27–$45/sq ft. A 300 sq ft composite deck averages $5,400–$9,000 installed.

200 sq ft deck (10×20): $3,600–$8,000. 300 sq ft deck (12×25): $5,400–$13,500. 400 sq ft deck (16×25): $7,200–$18,000. 500 sq ft deck (20×25): $9,000–$22,500. Costs vary by material, height, and complexity.

Pressure-treated pine at $11–$18/sq ft installed is the most affordable. A 300 sq ft deck costs $3,300–$5,400. However, it requires annual maintenance (staining, sealing) and typically lasts 10–15 years before needing replacement.

Composite costs 50–70% more upfront ($18–$30/sq ft vs $11–$18/sq ft for wood) but requires zero maintenance and lasts 25–30 years. Over 20 years, composite often costs less than wood due to maintenance savings and no replacement needed.

Deck height significantly impacts labor cost. Ground-level decks (< 2 ft) cost 15% less due to simpler foundations. Mid-height decks (6–12 ft) cost 15% more for complex framing. High decks (12+ ft) cost 35% more due to scaffolding, deeper footings, and safety requirements.

Most jurisdictions require permits for decks over 30 inches high or attached to the home. Permit costs run $200–$500. Unpermitted decks can cause problems during home sale, may not meet code safety standards, and could result in fines or forced removal.

A simple ground-level deck (200 sq ft) takes 3–5 days. A standard deck (300 sq ft, low height) takes 5–7 days. A large or elevated deck (400–500 sq ft) takes 7–14 days. Add 1–2 weeks for permit approval before construction begins.

A well-built deck typically adds 65–85% of its cost to home value. A $10,000 deck adds roughly $6,500–$8,500 in resale value. ROI is highest for mid-priced composite decks in good condition. Over-built luxury decks in modest neighborhoods see lower returns.