The average cost to build a deck is $25 to $50 per square foot or $3,600 to $7,200 on average. The total price depends on local labor costs, wood type, size, level built-on, and if there's seating or stairs built-in.
An average 12'x24' deck takes one to three weeks to build, depending on the size, style, and contractor's experience. A professional team takes under a week to build a standard deck, while a custom deck above the first-level with built-ins takes up to three weeks to finish.
A deck made of untreated wood lasts 10 to 30 years, depending on the quality and proper maintenance, sealing, and repairs. Decks made of treated wood and composite materials last 25 to 50 years.
Wood decks last 10 to 30 years with annual maintenance and repairs before disintegrating and potentially becoming dangerous or collapsing. Consider replacing decks older than 8 years that need major repairs or when the cost of repairs exceeds half the cost of new deck building.
Spending $10,000 on a new deck increases the value of a home by $7,500 on average. Adding a deck has a 70% to 80% return on investment when selling the home.
A building permit is required if the deck is attached to the home, services a door, over 200 square feet, more than 30 inches above the ground, has plumbing or electricity, or be built in a floodplain. Contact your local building authority to see if you need a permit in your area.
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