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.

• Decks need regular maintenance, sealing, minor repairs, and cleaning annually to remain habitable and safe.
• For major repairs, decks eight years old or less can be re-planked and re-railed without compromising the stability and safety of the structure.

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.

To find the best deck companies, do the following:

• Get at least three price estimates to compare.
• Ask for recommendations from family, friends, and neighbors.
• Read reviews and check out their previous work on HomeGuide and Google.
• Select companies that are licensed, bonded, and experienced.
• Ask if they are part of their local chamber of commerce or any trade associations such as the North American Deck & Railing Association (NADRA).
• Verify their insurance, worker’s compensation, and bond guarantees.
• Ask about their warranties and guarantees.
• Ask for a full itemized estimate or contract in writing.
• Avoid making large payments upfront. Come up with a payment schedule for work completed.

After asking questions, hire the best deck contractor near you.

When hiring a deck builder, ask them the following questions:

• How long have you been a deck contractor?
• What decking materials do you experience installing?
• What decking material do you recommend for my project?
• How many decks have you built?
• How much would my deck cost?
• What services are included in the cost?
• Are there any potential complications you foresee with this project?
• Can you provide testimonials and references from past customers?
• Are you licensed, insured, and bonded?
• How long will the project take?
• Do I need permits, and will you obtain them?
• What does your warranty policy include?
• Can you provide me a written estimate or contract?
• What’s your payment schedule?
• Are financing options available?
• What do I need to provide to get started?