How much does it cost to build a deck per square foot?

Installed, decks typically run $15–$50 per square foot: pressure-treated wood $15–$25, cedar $20–$35, and composite $25–$50.

How much does a 12x12 deck cost?

A 144 ft² deck runs roughly $2,200–$3,600 in pressure-treated wood, or about $3,600–$7,200 in composite, installed — before stairs, railings, and height factors.

Is composite decking worth it?

Composite costs more up front but needs far less maintenance than wood and lasts longer, which often pays off over the life of the deck.

How Much Does It Cost to Build a Deck?

Deck cost is driven first by size and decking material, then by the structural extras below. Here are typical installed costs per square foot and what moves the number.

Average deck cost per square foot (installed)

Pressure-treated wood: $15–$25 per ft²
Cedar: $20–$35 per ft²
Composite: $25–$50 per ft²

Multiply by your deck's area (length × width) for a ballpark total.

Open the deck cost calculator → Enter your deck size and material for an estimated range — then get free quotes from local deck builders.

What drives the price

Height above grade: a raised deck needs taller posts, bracing, and often stairs.
Railings and stairs: both add material and labor per linear foot and per flight.
Foundation and footings: deeper or more numerous footings cost more.
Built-in features such as benches, lighting, and pergolas.
Demolition of an old deck and local labor rates.

Choosing decking

Pressure-treated wood is the budget choice but needs regular sealing. Cedar is naturally rot- and insect-resistant with a warmer look. Composite costs the most up front but resists fading and rot and needs little more than an occasional wash — usually the lowest-maintenance option.

Frequently asked questions

How much does it cost to build a deck per square foot?: Installed, decks typically run $15–$50 per square foot: pressure-treated wood $15–$25, cedar $20–$35, and composite $25–$50.
How much does a 12x12 deck cost?: A 144 ft² deck runs roughly $2,200–$3,600 in pressure-treated wood, or about $3,600–$7,200 in composite, installed — before stairs, railings, and height factors.
Is composite decking worth it?: Composite costs more up front but needs far less maintenance than wood and lasts longer, which often pays off over the life of the deck.

Last updated June 2026.