Trex Deck Builders in Seattle: Certified Installers & Pricing

Why Seattle Homeowners Keep Choosing Trex

Seattle gets roughly 152 days of rain per year. That constant moisture warps wood decks, feeds mold growth, and turns annual maintenance into a chore most homeowners dread. Trex composite decking resists all of it — no sealing, no staining, no replacing rotted boards every few years.

That's the short version of why Trex dominates the Seattle deck market. The longer version involves some real math.

A pressure-treated wood deck costs less upfront — $25–$45 per square foot installed — but factor in annual power washing, sealing every 1–2 years, and board replacements, and you're spending $500–$1,000+ per year on upkeep. Over a decade, that gap between wood and composite shrinks dramatically. For many homeowners in neighborhoods like Ballard, Wallingford, and West Seattle, the lifetime cost of Trex actually comes out lower.

Trex boards are made from 95% recycled materials (reclaimed wood fiber and recycled plastic), which resonates with Seattle's sustainability-minded culture. They won't splinter, won't absorb moisture, and the newer lines include a protective shell that resists fading, staining, and mold — exactly what you need in the Pacific Northwest.

Choosing between composite and wood? Our composite vs wood decking comparison breaks down the real costs over 10 years. For full installed pricing by material type, see our deck cost guide.

Trex Product Lines Compared

Trex offers three main product lines, each with different performance levels and price points. Here's what matters for Seattle conditions specifically.

Trex Enhance

The entry-level line. It comes in two sub-options:

• Enhance Naturals — Variegated, wood-grain look with a protective shell on three sides
• Enhance Basics — Solid colors, simpler profile, most affordable Trex option

Enhance boards handle Seattle's moisture fine, but the shell coverage on Basics (three sides instead of full cap) means the unprotected bottom can absorb some moisture over time. For ground-level decks with limited airflow, that matters.

Trex Select

Mid-range option with a full shell encapsulation on all four sides. Better fade and stain resistance than Enhance. Fewer color choices, but the performance bump is significant for wet climates. This is the sweet spot for most Seattle builds.

Trex Transcend

Premium line with the deepest wood-grain textures and richest colors. Full shell on all sides, best scratch and fade resistance, and the widest color palette. If you're building a deck off a Craftsman in Queen Anne or a modern home in Madison Park and want it to look high-end for decades, Transcend delivers.

For a deeper comparison of composite brands available in the Canadian and US markets, check out the best composite decking brands to see how Trex stacks up against TimberTech, Fiberon, and others.

Trex Deck Costs in Seattle (2026)

Material costs are only part of the equation. Seattle's labor market, permit fees, and site-specific factors all affect your final number.

Installed Price Per Square Foot

These are 2026 Seattle-area estimates. Your actual cost depends on deck height, complexity (multi-level, curves, built-in seating), and whether you need new footings dug below the 12–24 inch frost line required in Seattle.

What a Typical Seattle Trex Deck Costs

For a standard 300-square-foot deck (roughly 12x25 feet) using Trex Select:

• Decking materials: $1,800–$2,400
• Substructure (pressure-treated framing): $1,200–$1,800
• Railing (Trex composite): $1,500–$3,000
• Labor: $6,000–$10,000
• Permits: $200–$800
• Total installed: $18,000–$24,000

If you're comparing this against other material options, here's how Trex fits into the broader Seattle pricing landscape:

The maintenance savings alone make Trex competitive over a 15-year window. And in Seattle's climate, wood decks rarely hit the upper end of their lifespan without significant repairs.

Pro tip: Dry season (June–September) is when every Seattle deck builder is booked solid. Schedule your consultation in January or February for a summer build. Many builders offer better pricing for winter bookings since they're competing for fewer projects.

Finding a TrexPro Certified Installer in Seattle

Not all deck builders who install Trex are created equal. Trex runs a certification program with two tiers, and the distinction matters.

TrexPro vs. TrexPro Platinum

• TrexPro — Completed Trex installation training, registered with Trex, meets minimum experience requirements
• TrexPro Platinum — Highest tier. Must maintain high customer satisfaction scores, complete advanced training, and install a minimum volume of Trex products annually

Both tiers give you access to Trex's full warranty coverage. But Platinum installers have a track record that Trex actively monitors. In a market like Seattle where shoddy installations can lead to moisture problems underneath the deck, that matters.

How to Verify Certification

1. Trex's online installer finder — Search by zip code on Trex.com to find registered TrexPro and Platinum installers in the greater Seattle area (including Bellevue, Kirkland, Redmond, and Tacoma)
2. Ask for their TrexPro ID — Any legitimate certified installer can provide this
3. Check their warranty registration — A certified installer registers your deck warranty directly with Trex after completion

What to Ask a Seattle Trex Installer

Before signing a contract, get answers to these:

• Do you use pressure-treated or steel substructure? (Both work, but PT lumber is standard in Seattle — make sure they're using ground-contact rated lumber for posts)
• How do you handle joist spacing? (Trex recommends 16" on center for residential, 12" for diagonal or herringbone patterns)
• What's your approach to ventilation underneath? (Critical in Seattle — trapped moisture under the deck accelerates substructure decay)
• Do you pull permits? In Seattle, deck permits are required for structures over 200 square feet or more than 30 inches above grade. Check with Seattle's Department of Construction & Inspections. Any reputable builder handles this.
• What's your lead time? Expect 8–16 weeks for summer builds if you're booking in spring. Winter consultations give you first pick of summer slots.

If you're also exploring builders in nearby cities, the guide on finding deck builders in Bellevue covers the Eastside market specifically.

Trex vs. Other Composite Brands in Seattle

Trex isn't your only composite option. Here's an honest comparison with the other brands Seattle builders commonly install.

Trex vs. TimberTech (AZEK)

TimberTech's Advanced PVC line (made by AZEK) is fully synthetic — no wood fiber at all. That gives it a slight edge in moisture resistance, which sounds appealing for Seattle. But Trex's capped composite performs nearly identically in real-world Pacific Northwest conditions. TimberTech PVC costs 10–20% more than comparable Trex lines. TimberTech's Pro line (composite, not PVC) is priced closer to Trex and performs similarly.

Trex vs. Fiberon

Fiberon offers competitive products at slightly lower price points. Their Paramount PVC line competes with Trex Transcend, while Good Life is their budget option. Fiberon has less brand recognition, which means fewer certified installers in the Seattle area. That's a practical consideration — you want a builder experienced with whatever product you choose.

Trex vs. Wood (Real Talk)

Some Seattle homeowners genuinely prefer the look and feel of real wood, and that's valid. Cedar is the most popular wood choice locally. If you go that route, budget for annual cleaning and sealing — Seattle's moisture will gray untreated cedar within a single season. For a thorough comparison of composite decking options in Canada and the US, that guide breaks down the full landscape.

Use PaperPlan to visualize different decking materials on your own home before committing — seeing Trex Transcend Havana Gold versus natural cedar on your actual house can make the decision clearer than any showroom sample.

Warranty and Maintenance in Seattle's Climate

What Trex's Warranty Actually Covers

Trex offers a 25-Year Limited Residential Warranty across all product lines. Key details:

• Structural integrity — Won't rot, crack, split, or suffer structural damage from termites or fungal decay
• Fade and stain resistance (Transcend, Select, Enhance Naturals) — Warranted against excessive color fade and permanent food stains
• Transferable — Warranty transfers to new homeowners if you sell, which adds resale value

What it doesn't cover: normal weathering, mold/mildew growth on the surface (that's surface dirt, not material failure), or damage from improper installation. This is why certified installers matter — an installation that doesn't meet Trex's specs can void the warranty.

Maintenance for Seattle Conditions

"Low maintenance" doesn't mean "no maintenance." Here's what Seattle Trex deck owners actually need to do:

• Twice-yearly cleaning — A garden hose and mild soap handles most buildup. Seattle's damp, shaded conditions promote surface mold (green film). This is cosmetic, not structural, but you'll want to clean it.
• Clear debris from board gaps — Leaves and pine needles trap moisture against the surface. Seattle's abundant trees make this a regular task, especially in fall.
• Check the substructure annually — Your Trex boards might last 25+ years, but the pressure-treated framing underneath still needs inspection. Look for soft spots, especially on posts near ground level.
• Snow/ice — Rare in Seattle, but when it happens, use calcium chloride (not rock salt) and a plastic shovel. Never metal.

For homeowners weighing aluminum substructure as a longer-lasting alternative to pressure-treated framing, aluminum deck framing eliminates the rot risk entirely, though at a higher upfront cost.

Frequently Asked Questions

How much does a Trex deck cost in Seattle?

A fully installed Trex deck in Seattle runs $50–$80 per square foot depending on the product line. A standard 300-square-foot deck using Trex Select typically costs $18,000–$24,000 including materials, labor, railing, and permits. Trex Enhance (budget line) brings that down to the $15,000–$18,000 range, while Transcend (premium) can push past $24,000. Summer labor premiums can add 10–15% if you book late in the season.

Is Trex worth it in Seattle's rainy climate?

Yes — Seattle is actually one of the best markets for composite decking. The constant moisture that destroys wood decks barely affects Trex. You won't deal with warping, rotting, or the annual seal-and-stain cycle that wood demands. The higher upfront cost pays for itself within 7–10 years through eliminated maintenance expenses. The only caveat: shaded Seattle decks do accumulate surface mold faster than in drier climates, so plan on cleaning twice a year.

How do I find a certified Trex installer near Seattle?

Start at Trex.com's dealer locator and search your zip code for TrexPro or TrexPro Platinum installers. The greater Seattle area (including Bellevue, Kirkland, Tacoma, and Everett) has multiple certified builders. Always verify their certification ID, check reviews, and confirm they pull permits. For guidance on choosing affordable deck builders in your area, compare at least three quotes before committing.

Do I need a permit for a Trex deck in Seattle?

In most cases, yes. Seattle requires building permits for decks over 200 square feet or more than 30 inches above grade. The permit process goes through Seattle's Department of Construction & Inspections (SDCI). Your builder should handle the application, but budget $200–$800 for permit fees and plan for 2–6 weeks of review time. Even small decks that technically don't require a permit still need to meet setback and zoning requirements.

How long does it take to build a Trex deck in Seattle?

A typical residential Trex deck takes 1–3 weeks of actual construction time once materials arrive and permits are approved. The bigger variable is scheduling. If you contact a builder in April wanting a July build, you might be out of luck — Seattle's best deck builders book their summer calendars months in advance. Start getting quotes in December or January for the best chance at your preferred timeline. Rain delays during shoulder season (May, October) can add several days to the project.