How much does a new deck cost?

A pressure-treated pine deck typically runs $15–$35 per square foot installed. Composite decking (Trex, TimberTech, Fiberon) ranges from $35–$65 per square foot. Cedar sits in between at $20–$45. Total cost depends on size, height, railing type, stairs, and local labor rates.

Does deck size include the framing and footings?

Contractors price by the square footage of the finished deck surface. Framing, ledger attachment, footings, and hardware are included in the per-square-foot bid — they are not billed separately unless you negotiate a cost-plus contract.

How many footings does a deck need?

The number of footings depends on the beam span, joist span, and local frost line depth. As a rough rule, a 12×16 deck needs 4–6 footings. Your contractor will size them per IRC Table R507.3.1 and your local soil bearing capacity.

Do I need a permit for a deck?

In most jurisdictions, yes — especially for attached decks or any deck elevated more than 30 inches above grade. Permits are required by IRC Section R507 and most local amendments. A contractor who suggests skipping the permit is a red flag; the permit protects you.

Deck Cost Calculator

Calculator

Deck length (ft)Deck width (ft)Decking materialDeck shape

Deck surface area

320 sq ft

Decking boards (linear ft, incl. waste)803 ft
16-ft boards to order51
Joists at 16″ on center13
Waste allowance (15%)included above
Estimated installed cost$9,600 – $19,200

Board counts assume 5½″ face-width decking in 16-ft lengths and 16″ joist spacing. Cost is a directional installed range — framing height, railings, stairs, footing depth, and demolition all move the real number. Always confirm with a deck builder’s measured take-off before ordering.

How it works

How deck pricing is calculated

Step 1: Measure the deck area. Multiply the length by the width of the finished deck surface in feet. For an L-shaped or irregular deck, break it into rectangles and add the areas together.

Step 2: Choose a material. Pressure-treated pine is the most affordable option and the industry standard for framing regardless of the decking surface. Cedar is naturally rot-resistant and mid-range in price. Composite decking (brands like Trex, TimberTech, and Fiberon) costs more upfront but requires little maintenance and typically carries a 25–30 year warranty.

Step 3: Account for complexity. Ground-level decks are simpler and cheaper to build than elevated decks, which require taller posts, additional bracing, and more extensive footings. Stairs, built-in seating, and multiple levels add cost. A basic single-level deck costs less per square foot than one with custom railings, lighting, and a pergola.

Step 4: Add the permit and inspection cost. Most jurisdictions require a building permit for attached or elevated decks. Permit fees typically run $150–$500 depending on your municipality. Factor this into your budget — the permit is the homeowner’s legal protection and the contractor should pull it before breaking ground.

Decking material cost comparison

Material	Installed cost/sqft	Lifespan	Maintenance
Pressure-treated pine	$15–$35	15–25 yrs	Annual sealing recommended
Cedar	$20–$45	20–30 yrs	Annual sealing recommended
Composite (mid-grade)	$35–$55	25–30 yrs	Occasional cleaning only
Composite (premium)	$50–$65	30+ yrs	Minimal — fade/stain warranty
Cellular PVC	$50–$70	30+ yrs	Minimal — no splinters or rot
Tropical hardwood (Ipe)	$55–$80	25–40 yrs	Annual oiling required

Cost ranges reflect typical installed prices including labor, framing, and fasteners. Regional labor rates vary significantly — get local bids to confirm.

FAQ

Frequently asked questions

How much does a new deck cost?
A pressure-treated pine deck typically runs $15–$35 per square foot installed. Composite decking (Trex, TimberTech, Fiberon) ranges from $35–$65 per square foot. Cedar sits in between at $20–$45. Total cost depends on size, height, railing type, stairs, and local labor rates.
Does deck size include the framing and footings?
Contractors price by the square footage of the finished deck surface. Framing, ledger attachment, footings, and hardware are included in the per-square-foot bid — they are not billed separately unless you negotiate a cost-plus contract.
How many footings does a deck need?
The number of footings depends on the beam span, joist span, and local frost line depth. As a rough rule, a 12×16 deck needs 4–6 footings. Your contractor will size them per IRC Table R507.3.1 and your local soil bearing capacity.
Do I need a permit for a deck?
In most jurisdictions, yes — especially for attached decks or any deck elevated more than 30 inches above grade. Permits are required by IRC Section R507 and most local amendments. A contractor who suggests skipping the permit is a red flag; the permit protects you.

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