Trex Composite Decking Seattle
The most popular composite brand in King County — installed by a certified Trex contractor. Transcend, Select, and Enhance lines available. Manufacturer-backed warranty on both materials and labor.
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Why We Specify Trex on Most King County Decks
25-Year to Lifetime Warranty
Trex backs every board with a fade and stain warranty. Select and Enhance lines carry 25-year coverage. Transcend and Transcend Lineage carry a lifetime warranty — the strongest in the composite category.
Certified Trex Contractor
We are a trained Trex installer — not just a dealer. Certified contractor status means the manufacturer backs our labor alongside the materials, and we have direct access to Trex technical support on complex installs.
4-Sided Cap on Every Board
We only install Trex's fully capped lines. The polymer cap wraps all four sides of every board — including the grooved underside — blocking moisture from the wood-fiber core. Uncapped boards fail in Seattle's climate within 5 years.
Trex is the most-installed composite decking brand in King County — and for good reason. Every board in every line we install carries a fully capped polymer shell that physically blocks the moisture and mold that define Seattle's challenge. We install Trex on hillside lots in Bellevue, forested properties in Issaquah, and lakefront builds in Kirkland. For a full comparison of Trex against TimberTech and Fiberon, see our composite decking page or the PNW materials guide.
Trex Product Line Comparison — King County Guide
| Product | Line | Material Cost | Warranty | Best For |
|---|---|---|---|---|
| Trex Select | Entry-capped | $7–$10/sq ft | 25 yr fade/stain | Value builds, South King County |
| Trex Enhance Naturals | Mid | $8–$12/sq ft | 25 yr | Natural wood look, moderate lots |
| Trex Enhance Basics | Mid | $7–$10/sq ft | 25 yr | Clean modern look, HOA-friendly |
| Trex Transcend | Premium | $13–$18/sq ft | Lifetime | Bellevue, Kirkland, Sammamish view decks |
| Trex Transcend Lineage | Premium | $15–$21/sq ft | Lifetime | Deepest grain, most realistic wood look |
What Does Trex Cost Installed in King County?
Entry — Trex Select
$20,000–$30,000
300–400 sq ft installed
Common in: East Hill Kent, Federal Way, Auburn
Warranty: 25-year fade and stain
Mid — Trex Enhance
$25,000–$38,000
300–400 sq ft installed
Common in: Renton, Redmond, Bothell
Warranty: 25-year fade and stain
Premium — Trex Transcend
$35,000–$55,000
300–500 sq ft installed
Common in: Bellevue, Kirkland, Sammamish
Warranty: Lifetime fade and stain
Elevated Site Add
+$5,000–$18,000
Any deck size
Applies to: Hillside lots in West Hill Kent, Mercer Island, Dash Point requiring engineered post systems
For a complete breakdown of project costs across materials, sizes, and King County neighborhoods, see our Seattle deck cost guide.
Why Trex Outperforms Cedar and PT Wood in Seattle's Climate
- water_dropPNW moisture resistance — 4-sided cap blocks all moisture: Trex's polymer shell on all four board surfaces means moisture cannot reach the wood-fiber core regardless of how wet Seattle's winters get. On shaded Issaquah lots where cedar develops visible mold in 1–2 seasons, Trex boards stay clean with an annual rinse.
- scienceTrex shell technology vs competitors: The Trex cap layer is a solid polymer shell — not a thin veneer. It encapsulates the wood-fiber core on all sides, including the grooved underside that contacts hidden fastener clips. The shell is the reason Trex boards can sit in contact with metal hardware without the corrosion-accelerated rot that exposed wood-fiber boards develop around fastener holes.
- recycling95% recycled content: Trex composite boards are made from 95% recycled materials — primarily reclaimed wood and plastic film. Every 500 sq ft Trex deck uses approximately 140,000 recycled plastic bags. This is a genuine recycled-content claim, not a marketing one — Trex operates its own material reclamation facilities.
- cleaningSplinter-free, no annual staining — just soap and water: Trex boards never splinter, warp, or check. Annual maintenance is a rinse with mild soap and water — no staining, sealing, or sanding, ever. Cedar at the same size requires professional staining every 2–3 years at $400–$800 per application over the life of the deck.
Trex Decking FAQs
Q: Is Trex the best composite for Seattle weather?
Yes — Trex's fully capped lines (Select, Enhance, Transcend) are excellent for Pacific Northwest conditions. The 4-sided polymer cap is critical: it blocks moisture from reaching the wood-fiber core regardless of Seattle's 38 inches of annual rain or north-facing shade. Don't let any contractor install uncapped boards — uncapped composite fails in 5 years in Seattle's wet climate. If a quote seems unusually low, ask specifically which Trex line is being specified.
Q: What's the difference between Trex Select, Enhance, and Transcend?
Trex Select is the entry-level capped line — solid PNW performer at the lowest Trex price point, 25-year warranty. Trex Enhance adds texture and color variety with two sub-lines: Naturals (multi-tonal wood grain pattern) and Basics (clean solid-color look), both carrying 25-year warranties. Trex Transcend is the premium line with the deepest grain replication, a wider color palette including variegated multi-color boards, a heat-mitigating cap that reduces surface temperature, and a lifetime fade and stain warranty. For most King County projects where HOA aesthetics or premium appearance matter, Transcend is the right spec. See our composite decking page for a full brand comparison.
Q: How long does Trex decking last in Seattle?
Trex Transcend and Transcend Lineage carry lifetime fade and stain warranties. In Seattle conditions, properly installed Trex boards last 30–50 years — we've seen Trex boards from the early 2000s still in excellent condition on Eastside lots. The structural framing (joists, beams, posts) typically fails before the Trex boards do. Trex Select and Enhance carry 25-year warranties and perform similarly in practice; the warranty difference reflects color and appearance standards, not structural lifespan.
Q: What does Trex cost installed in King County?
Trex Select installed runs $20,000–$30,000 for a standard 300–400 sq ft deck in King County — $55–$80/sq ft all-in including demo, framing, boards, hidden fasteners, permit, and labor. Trex Enhance is $25,000–$38,000 for the same size. Trex Transcend — the most commonly specified premium line — runs $35,000–$55,000 for 300–500 sq ft. Hillside lots with engineered post systems add $5,000–$18,000. For a complete breakdown by neighborhood, see our Seattle deck cost guide. We also install PVC decking for zero-wood-fiber applications.
We install Trex throughout King County — Bellevue hillside view decks, Sammamish HOA communities, Kirkland waterfront properties, and Issaquah forested lots where cedar develops moss within the first season. For a full comparison of all decking materials and brands, read our Pacific Northwest decking materials guide.
Get Your Trex Deck
Built Before Summer
Trex Transcend, Enhance, and Select — installed by King County's certified Trex contractor. We pull the permits, handle the demo, and don't leave until it's done right.
No obligation. We'll walk your property, discuss Trex line options, and send a written estimate within 48 hours.