Composite decking has overtaken wood as the go-to material for new backyard decks, and the reason is simple: it never needs staining, resists rot and splinters, and lasts 25 to 30 years. The trade-off is the upfront price. So how much is a composite deck? For a standard installation you should plan on roughly $30 to $60 per square foot installed, which works out to about $9,000 to $24,000 for a typical 300-square-foot deck. The wide range comes down to brand, deck height, railing choice, and your local labor rates. This guide breaks the numbers down so you can build a realistic budget.
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The Quick Answer: Cost Per Square Foot
Most composite deck projects fall into a predictable per-square-foot band once you include both material and labor. Composite boards themselves run about $4 to $13 per square foot, and professional installation adds roughly $15 to $35 per square foot on top. Combined, expect $30 to $60 per square foot installed for a complete deck with railing. Entry-level capped composite on a simple ground-level rectangle sits at the low end, while premium boards with elaborate railings and an elevated frame push toward the top.
Material Costs by Brand
Brand and product line drive a big share of the price. Here is where the major names land per square foot for boards alone:
- Trex Enhance (entry capped composite) — about $4 to $6 per sq ft
- Trex Transcend (premium) — about $7 to $11 per sq ft
- TimberTech Edge — about $5 to $8 per sq ft
- TimberTech AZEK (capped polymer, top tier) — about $9 to $15 per sq ft
- Fiberon and Deckorators — roughly $5 to $10 per sq ft
The premium lines justify their cost with richer multi-tone colors, better fade and scratch warranties, and more realistic wood-grain texture. AZEK’s capped polymer construction, for example, carries no wood fiber at all, which improves moisture and stain resistance.
Labor and Installation
Labor typically accounts for nearly half the total project cost. A pro charges for framing the substructure, installing the boards with hidden fasteners, and building the railing and stairs. Ground-level decks are cheapest to build because they need a simpler frame and no tall posts. Elevated decks, decks over uneven terrain, and multi-level designs all add framing complexity and labor hours. Regional labor rates matter too; the same deck costs noticeably more in a high-cost coastal metro than in a rural area.
What Drives the Price Up or Down
Several factors swing your final number meaningfully:
- Deck size — Larger decks cost more in total but often a little less per square foot.
- Height and stairs — Elevated decks need more framing, posts, and longer stair runs.
- Railing type — Composite railing runs $30 to $60 per linear foot; aluminum or cable rail costs more.
- Board pattern — Diagonal, picture-frame, or herringbone layouts add cutting time and material waste.
- Substructure — Pressure-treated framing is standard; steel or composite framing adds cost but extends life.
- Site prep and permits — Demolition of an old deck, grading, and permit fees all add up.
Composite vs. Wood: The Long View
A pressure-treated wood deck costs roughly half as much upfront, around $15 to $30 per square foot installed, which tempts a lot of buyers. But wood demands staining and sealing every two to three years at $500 to $1,000 each time, and boards eventually rot, warp, and splinter. Composite carries no recurring finish cost and typically lasts decades longer. Run the math over 20 years and composite often comes out even or ahead, while saving you every weekend you would have spent sanding and staining.
A Sample Budget
To make it concrete, here is a realistic mid-range 300-square-foot composite deck:
- Composite boards (Trex Transcend) — about $2,700
- Pressure-treated substructure and hardware — about $1,800
- Composite railing (40 linear feet) — about $1,800
- Labor — about $7,500
- Permit and site prep — about $700
That lands near $14,500, squarely in the middle of the expected range.
Cost by Deck Size
It helps to see how the price scales with square footage at a mid-range $45 per square foot installed:
- 144 sq ft (12×12) — roughly $6,500
- 200 sq ft (10×20) — roughly $9,000
- 300 sq ft (12×25) — roughly $13,500
- 400 sq ft (16×25) — roughly $18,000
- 500 sq ft (20×25) — roughly $22,500
Remember these are mid-range figures. Drop to entry-level boards and a ground-level frame and you trend toward the lower bound; add a premium board, elevated framing, and elaborate railing and you push past the top.
Hidden Costs People Forget
The board price is only part of the story, and overlooked line items are what blow budgets. Demolition and disposal of an old deck can add $1,000 to $3,000. Permit fees vary by municipality but often run $150 to $500. If the deck is elevated, you may need additional footings, taller posts, and a longer stair run, all of which add labor. Lighting, built-in benches, planters, and a privacy screen are popular add-ons that each add hundreds to thousands. Finally, factor a 10 percent material overage for cuts and waste, especially with picture-frame or diagonal layouts that generate more offcuts.
Financing and Return on Investment
A composite deck is a significant purchase, but it tends to pay you back. Outdoor living additions consistently rank among the home improvements buyers value most, and a quality deck can recoup a healthy share of its cost at resale while expanding your usable living space for far less than an interior addition. Many homeowners finance the project through a home equity line or a contractor financing plan; if you go that route, compare interest rates against simply waiting and paying cash. Either way, the lack of recurring staining costs means a composite deck’s total cost of ownership stays flat after installation, unlike a wood deck that keeps demanding money every few years.
How to Save Without Cutting Corners
You can trim the budget intelligently. Choose an entry-level capped composite like Trex Enhance instead of a premium line, keep the deck at ground level to avoid tall framing, and stick to a simple rectangular shape with a straight board layout. Pairing composite boards with a more affordable aluminum railing or pressure-treated framing also shaves cost. Get at least three written quotes, confirm the contractor uses hidden fasteners and proper joist spacing of 16 inches on center, and you will get a deck that looks great and lasts for the next quarter century.
