URL slug: /cost-guides/composite-decking-comparison/ Target keywords: composite decking comparison Seattle | Trex vs AZEK cost | best composite decking Pacific Northwest | Fiberon vs Trex
Composite decking has largely replaced pressure-treated wood as the material of choice for new decks in the Puget Sound. The main brands — Trex, AZEK, and Fiberon — each have a distinct product lineup, warranty structure, and price point. Here’s how they compare for homeowners in the Seattle metro.
The Three Main Composite Brands
Trex is the largest composite decking manufacturer in North America and the most widely specified by contractors in King County. Trex is made from 95% recycled wood and plastic film — it’s one of the most environmentally responsible products in the category. The main product lines, from entry-level to premium, are: Trex Select, Trex Enhance, and Trex Transcend.
AZEK (now part of the TimberTech brand family) is a PVC-based composite — it contains no wood fiber, which makes it more resistant to moisture and staining than wood-blended products. It’s the premium choice for homes close to water, like Puget Sound waterfront properties, where moisture exposure is highest.
Fiberon is a wood-polymer composite with good durability at a slightly lower price point than AZEK. It’s the value play among premium composites.
Cost Comparison — Installed, King County
Prices below reflect installed cost by a licensed contractor in King County, including framing, decking, a basic post railing, and permit. Not materials only.
| Product | Material Tier | Installed Cost (400 SF deck) |
|---|---|---|
| Trex Select | Entry | $16,000–$21,000 |
| Trex Enhance | Mid | $19,000–$25,000 |
| Trex Transcend | Premium | $24,000–$32,000 |
| AZEK Harvest / Landmark | Entry-Mid | $22,000–$29,000 |
| AZEK Arbor / Vintage | Premium | $28,000–$38,000 |
| Fiberon Good Life / Promenade | Mid | $18,000–$24,000 |
Costs vary by project complexity, site conditions, and current material pricing. Get a project-specific estimate from Prolific — free estimate here →
Warranty Comparison
| Brand | Fade & Stain | Structural | Notes |
|---|---|---|---|
| Trex Transcend | 25 years | 25 years | Requires certified contractor for full warranty |
| Trex Enhance | 25 years | 25 years | |
| AZEK (TimberTech) | 30 years | 30 years | No-sand, no-stain guarantee |
| Fiberon Promenade | 25 years | 25 years |
Which One Is Right for the Pacific Northwest?
The Puget Sound climate — high moisture, significant UV variation, pollen and debris — tests composite decking differently than drier climates. A few notes:
Moisture resistance: AZEK’s PVC core gives it the edge in high-moisture environments. If your deck is shaded, north-facing, or near the water, AZEK is worth the premium.
Heat retention: Dark composite colors can get hot in direct summer sun. Trex Transcend and AZEK both offer cooler-surface technology in their premium lines.
Mold and mildew: All three brands resist mold better than wood, but shaded decks in western Washington still benefit from periodic cleaning. AZEK requires the least maintenance.
As a Trex Pro certified contractor, Prolific can offer Trex’s full 25-year residential fade and stain warranty — only available through certified installers.
The Bottom Line
For most King County homeowners: Trex Enhance is the sweet spot — mid-range price, 25-year warranty, widely available locally. Go up to Trex Transcend or AZEK if you’re on or near the water, have a shaded north-facing deck, or are building a show deck before selling.
Get a composite deck estimate from Prolific →
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