Composite Deck Builders: Trex, TimberTech & More
Low-upkeep composite decks that stand up to Northwest rain, built and replaced by a TrexPro certified team in Renton, Seattle, Mukilteo, and across the Puget Sound.
- TrexPro certified
- Trex, TimberTech, Fiberon
- One-year workmanship warranty
- Rated 4.9 on Google
Reviewed by Matan Four, Owner · Updated November 2026
Who builds composite decks in Renton, Seattle, and Mukilteo?
Dawn Construction builds and replaces composite decks across the Puget Sound from our offices in Renton and Mukilteo. We’re TrexPro certified, and we install Trex, TimberTech, Fiberon, and other major composite brands, on a frame built for our wet climate. Every project comes with a one-year workmanship warranty.
- Company
- Dawn Construction WA LLC
- Certification
- TrexPro certified
- Brands
- Trex, TimberTech, Fiberon, and more
- Offices
- Renton and Mukilteo
- License
- WA Lic. #DAWNCCW747K2
- Warranty
- One-year workmanship warranty
Why choose composite decking for Pacific Northwest rain?
Water, not wear, is what ruins most decks here. Wood boards soak it up, then crack, splinter, and rot unless they’re refinished every few years. Capped composite boards have a protective shell on the top and sides that resists moisture, staining, and fading, so they need cleaning, not staining or sealing.
| Capped composite | Cedar | Pressure-treated | |
|---|---|---|---|
| Upkeep in our rain | Cleaning only | A fresh finish every few years | Regular cleaning and sealing |
| Boards rot? | No | Heartwood resists decay | Depends on the treatment grade |
| Splinters | No | Can splinter as it weathers | Can splinter and check |
| Look | Holds its color | Warm natural wood | Classic wood, weathers to gray |
| Up-front cost | Highest | In between | Lowest |
The full comparison: cedar vs composite vs pressure-treated decking.
Trex, TimberTech, or Fiberon: which composite brand is right for you?
All the major brands make capped composite boards that hold up in our rain. The differences are in the colors, textures, board lines, railings, and warranties. Trex, for example, offers residential warranties of 25 years on Enhance, 35 years on Select, and 50 years on Transcend; read the cleaning terms, because a stain claim requires following the maker’s care steps.
As TrexPro certified installers who also work with TimberTech, Fiberon, and other brands, we bring samples to your free in-home estimate and help you compare them side by side, so you choose by look and budget, not by what one installer happens to carry.
What composite deck work do we do?
| Service | What it covers |
|---|---|
| New composite decks | Footings, frame, composite decking, railings, and stairs |
| Wood deck to composite | The old wood deck comes out and a new composite deck goes in. See deck replacement in Mukilteo |
| Re-decking with composite | New composite boards on an existing frame that’s solid and spaced for composite |
| Railings and stairs | Composite, wood, and other railing styles, plus stairs to the yard |
| Borders and curves | Picture-frame borders and boards cut to follow curved walls and edges |
| Deck and patio together | A composite deck with a paver patio below or beside it |
Why the frame under a composite deck matters
Composite boards are the walking surface, not the structure. The joists, beams, and posts underneath are usually wood, and they need the right treated lumber: wood near the soil must be rated for ground contact. Each composite brand also lists the joist spacing its boards need; following it keeps the deck from bouncing or sagging and keeps the warranty valid. When we re-deck an existing deck, we check the frame first.
Composite decks we’ve built
See the full Mukilteo deck and patio project, the Seattle deck page with a video, and our portfolio.
How does a composite deck project work?
- Free in-home estimateWe measure, check the site or the existing frame, bring composite samples, and send a written quote.
- Choose the brand and colorYou pick the decking, railings, and stairs.
- PermitWe prepare and submit the permit when your deck needs one.
- FrameFootings and framing built to code, with joist spacing for your composite brand.
- Decking, railings, and stairsInstalled to the maker’s instructions, with borders and clean edges.
- WalkthroughWe review every detail with you and explain how to care for your composite deck.
What affects the cost of a composite deck?
Every deck is priced individually. You get a written quote after a free in-home estimate, and financing is available.
| Cost factor | Why it matters |
|---|---|
| Size and shape | More square feet, curves, and corners mean more material and labor |
| Brand and board line | Each brand and line is priced differently |
| Height and slope | Raised decks need taller posts, bigger footings, railings, and stairs |
| Frame | A new frame, or repairs to the existing one |
| Railings and stairs | Style, material, and the number of stairs |
| Old deck removal | Demolition and disposal |
| Permit | Drawings and inspections, when required |
What our deck customers say
We absolutely love our new deck replacement with Dawn Construction WA was fantastic from beginning to end. Jake was professional, responsive, and made sure we were happy with every step of the process. The finished deck looks fantastic and feels very well built.
Selected Dawn Construction to replace a deck for me as they presented a competitive bid and had a time frame that worked for us. Work was done ahead of schedule, promptly and with excellent results. Have requested they bid on some other projects and look forward to working with them in the future.
Composite decks: frequently asked questions
Do you install Trex decking?
Yes. Dawn Construction is TrexPro certified, and we install Trex along with TimberTech, Fiberon, and other major composite brands.
What is composite decking?
Composite boards are made from a blend of plastic and wood fibers and look like wood. Capped composite has a protective shell on the top and sides that resists moisture, staining, and fading.
Does composite decking hold up in Pacific Northwest rain?
Yes. Capped composite needs the least upkeep of any decking in our wet climate: no staining or sealing, only cleaning. It should still be washed regularly, because mold can grow on pollen and debris that settle on any deck.
Can you put composite boards on my existing deck frame?
Sometimes. If the joists, beams, posts, and house connection are solid and the joist spacing matches what the composite brand requires, we can re-deck with composite. If the frame is rotting, we rebuild it first.
Which composite brand should I choose?
It depends on the look, colors, texture, and warranty you want. We bring samples to your free in-home estimate and help you compare Trex, TimberTech, Fiberon, and other brands side by side.
Is composite decking more expensive than wood?
Composite usually costs more to install than pressure-treated wood, but it saves on upkeep over the years. Every deck is priced individually, with a written quote after a free in-home estimate, and financing is available.
Do I need a permit for a composite deck?
The decking material doesn’t change the permit; the deck’s height, size, and location do. Each city sets its own rules. We check yours at the estimate and handle the permit when one is needed.
Where do we build composite decks?
Across 45 cities in 9 counties, from Bellingham to Olympia. City guides: deck builders in Renton, deck builders in Seattle, and deck builders in Mukilteo. See all deck building services and our full service area.
Sources
- Trex, limited warranty document (2023)
- Trex, TrexPro builders
- American Wood Protection Association, residential use category guide
Ready for a composite deck?
Get a free in-home estimate with composite samples and a written quote. Prefer to talk? Call us, Sunday–Friday, 8am–10pm.
Talk to our team(206) 672-1711Sunday–Friday, 8am–10pm