Composite Decking Seattle WA
King County's most-installed material — zero maintenance, 25–30 year warranty. Seattle's most experienced deck builder. Capitol Hill to Magnolia. Beacon Hill to Ballard. 15+ years in King County — we know Seattle's permit office, microclimates, and what every neighborhood expects.
Why Seattle Homeowners Choose Composite Decking
Composite decking combines wood fiber and recycled plastic into a board that looks like real wood, holds up to Pacific Northwest rain without rotting, and requires only an annual hose-down. Trex, TimberTech, and Fiberon are the three brands we install — each with different performance profiles for Seattle's microclimate.
Seattle's 38 inches of annual rain plus summer UV creates a demanding test environment for decking. Composite outperforms cedar in this climate on every metric except first cost — after year 3, composite is the less expensive material on a per-year basis once you factor in cedar's staining, sealing, and replacement costs.
fact_checkComposite Decking — Quick Facts
check_circleBest For
- →Homeowners who want zero maintenance
- →HOA properties requiring consistent appearance
- →Properties with full sun or full shade exposure
- →Replacement of aging PT or cedar frames
Composite Decking in Seattle — What to Know Before You Start
Permit & Timeline
City of Seattle Department of Construction & Inspections (SDCI) handles residential deck permits through seattle.gov/sdci. Standard processing: 4–8 weeks. We submit complete applications — you sign off, we handle the rest.
HOA & CC&Rs
Seattle has minimal residential HOAs. Most projects are straightforward permit-only. Shoreline properties on Lake Washington and Lake Union require Shoreline Management Act review.
Seattle Site Conditions
Seattle SDCI permit timelines run 4–8 weeks — longer than Eastside cities. We submit complete applications on first attempt to avoid revision cycles that extend timelines further.
mapSeattle Neighborhoods We Serve
We serve all Seattle neighborhoods for composite decking projects — and surrounding King County areas. Landmarks nearby: Discovery Park, Green Lake Park, Seward Park, Lincoln Park, Golden Gardens. Serving all of King County.
Composite Decking Cost Guide — Seattle 2026
Prices reflect Seattle market rates. Actual quotes depend on site conditions, railing choice, and project complexity.
| Project Size | Low Estimate | Mid Estimate | High Estimate | Notes |
|---|---|---|---|---|
| Small (200–300 sq ft) | $5,000 | $9,750 | $15,600 | Composite railing, standard footings |
| Standard (350–450 sq ft) | $8,750 | $15,600 | $23,400 | Most common Seattle project size |
| Large (500–700 sq ft) | $12,500 | $23,400 | $36,400 | Cable or glass railing; pergola cover |
| Premium / Multi-level | $23,400 | $33,800 | $120,000+ | Engineering, hillside, HOA, glass railing |
Ready for a Seattle Composite Decks estimate?
Free estimates · Licensed & insured · King County's #1 deck builder
Composite Decking Brands We Install in Seattle
Pacific Northwest Build Window — Seattle
Seattle's optimal build season runs April through October. Permit submission to City of Seattle Department of Construction & Inspections (SDCI) takes 4–8 weeks — submit in January or February to capture an April or May project start. HOA review adds additional lead time — contact us to plan the full submission timeline.
Composite Decking Seattle — Frequently Asked Questions
How much does composite decking cost in Seattle?
Composite Decking in Seattle runs $25–$52 per square foot installed. A standard 350–450 sq ft deck runs $8,750–$23,400 depending on railing type, site conditions, and whether engineering is required. Premium configurations with glass railing and pergola cover run higher. Call us for a free site-specific estimate.
Do I need a permit for composite decking in Seattle?
Yes — City of Seattle Department of Construction & Inspections (SDCI) requires a permit for residential deck construction. Processing time: 4–8 weeks. We handle permit applications as part of our service and submit complete packages to minimize revision cycles. Seattle has minimal residential HOAs. Most projects are straightforward permit-only. Shoreline properties on Lake Washington and Lake Union require Shoreline Management Act review.
What composite decking brands do you install in Seattle?
We install TimberTech Vintage Collection, TimberTech Pro Legacy, Trex Transcend, Trex Select, Fiberon Paramount in Seattle. Our material recommendation depends on your site conditions — seattle sdci permit timelines run 4–8 weeks — longer than eastside cities we submit complete applications on first attempt to avoid revision cycles that extend timelines further. affects which products perform best on your specific lot.
How long does a composite decking project take in Seattle?
Free estimate: same week. Design and material selection: 1–2 weeks. Permit processing: 4–8 weeks. Active construction: 7–12 days for a standard 350–450 sq ft deck. Total from first call to final inspection: 8–14 weeks typical. HOA review (where applicable) adds 3–5 weeks before permit submission.
Are you licensed and insured for work in Seattle?
Yes — we are licensed under Complete Consulting and Construction (CC# COMPLCC882Q5), bonded, and fully insured for all Seattle projects. We carry general liability and workers' compensation and pull all required permits.
More Seattle Deck Services
Cedar Decking in Seattle
Pacific Northwest's traditional material — natural beauty, honest character, honest maintenance requirements
PVC Decking in Seattle
Maximum moisture resistance — the correct spec for waterfront, saltwater-adjacent, and high-humidity sites
Membrane Decking in Seattle
Waterproof walking surface for decks over living space — the only solution that works in Seattle's rain
Custom Curved Decks in Seattle
Radius cuts. Sweeping transitions. Designs that follow the house's architecture rather than fighting it
All Seattle Deck Services →
home