How Much Does a Trex Deck Cost? Composite Decking Price Guide

Trex deck cost in the Bay Area typically runs between $50 and $90 per square foot installed. For a standard 12-by-16-foot deck, that works out to roughly $9,500 to $16,000, depending on the product line and your site.

Here’s the number most homeowners don’t see coming: a Trex deck can cost two to three times more than pressure-treated wood up front, yet often costs less over its lifetime. That gap exists because composite decking never needs sanding, staining, or sealing. These recurring expenses quietly make a cheap wood deck the more expensive material. As a Bay Area outdoor construction contractor, we walk homeowners through both the sticker price and the 25-year math. So, before you budget for a Trex deck, let's look at exactly what goes into the price and where the value shows up.

How Much Does a Trex Deck Cost in the Bay Area?

Across the East Bay, a professionally installed Trex deck generally falls between $50 and $90 per square foot. That range reflects two realities: composite material costs more than lumber, and Bay Area labor rates sit well above national averages. For a typical mid-size deck, most homeowners land between $10,000 and $25,000 all-in. On hillside lots in Danville and the surrounding hills, elevated framing and tight access can push a project toward the top of that range.

Trex Deck Cost Per Square Foot by Product Line

Trex sells several decking tiers, and the line you choose is one of the biggest levers on price:

Enhance is the value line, Select balances cost and looks, and Transcend offers the richest colors and the longest fade-and-stain warranty.

Trex Deck Cost by Deck Size

Total cost scales with square footage, but so do fixed extras like stairs and railings. Here is what common deck sizes tend to run in the East Bay:

Smaller decks cost more per square foot because setup, railings, and stairs are spread across less area.

What Drives Composite Decking Prices?

Two decks of the same size can be quoted thousands apart. The biggest cost drivers are:

• Substructure: the framing, footings, and posts hidden beneath the boards
• Height and stairs: elevated decks need more framing, railings, and code-compliant stairs
• Railing choice: composite, aluminum, and glass railings vary widely in price
• Site access: tight or sloped lots slow installation and raise labor
• Demolition: removing and hauling away an old deck adds to the total

On most Bay Area projects, the substructure and railings together account for a large share of the final number, not just the deck boards themselves.

Trex vs Wood Decking Over 25 Years

This is where composite earns its premium. A wood deck needs cleaning, sanding, and re-staining every two to three years, and boards still warp, splinter, and rot in the Bay Area's wet winters and dry summers. Trex needs only an occasional wash. Over 25 years, those skipped maintenance cycles often erase the upfront gap. For homeowners who plan to stay put, the long-term math usually favors composite.

Frequently Asked Questions

Is a Trex deck worth the extra cost?

For most homeowners who plan to keep their deck for years, yes. Trex costs more up front than wood but eliminates staining, sealing, and board replacement, and it holds up well to the Bay Area's fog and summer sun, so lifetime cost often comes out lower.

How much does a 12x16 Trex deck cost?

In the Bay Area, a 12-by-16-foot Trex deck (192 square feet) typically runs about $9,500 to $16,000 installed, depending on the product line, railing style, deck height, and site conditions.

How long does a Trex deck last?

A Trex composite deck typically lasts 25 to 30 years or more, and Trex backs its boards with a 25-to-50-year limited warranty against fading and staining, well beyond what an untreated wood deck usually survives without major repairs.

Is a Trex Deck Worth It for Your Bay Area Home?

A Trex deck rarely wins on upfront price, but it often wins on everything after that: maintenance, durability, and how it looks a decade in. If you would rather spend weekends using your deck than refinishing it, composite is usually worth the premium.

Elite Development Builders designs and builds custom decks for homeowners across the East Bay, with one licensed team from layout to the final board. For a free, detailed quote on your deck, contact Elite Development Builders or call (925) 504-7086.