What type of deck project do you need?

A pressure-treated wood deck costs $15–$25 per square foot installed. Composite decking runs $25–$45 per square foot. A 300 sq ft deck averages $4,500–$7,500 in wood or $7,500–$13,500 in composite. Elevated decks, stairs, and railings add to the total.

For most homeowners, yes. Composite costs 50–80% more upfront but requires no staining, sealing, or annual maintenance. It won’t rot, splinter, or attract insects. Over a 25-year lifespan, composite typically costs less than wood when you factor in maintenance time and materials.

In most jurisdictions, yes. Decks over 30 inches above grade, attached to the house, or exceeding 200 sq ft typically require a building permit. Freestanding ground-level decks may be exempt. Your contractor should pull permits — unpermitted work can cause problems at resale and void insurance.

A simple 12x16 deck takes 1–3 days for an experienced crew. Multi-level decks, complex shapes, or decks with pergolas take 1–2 weeks. Permit approval adds 1–4 weeks depending on your municipality. Material delivery lead times can also affect the schedule.