Is Composite Decking Worth It in Skagit County? An Honest Look at Pros, Cons and Who It Suits

Updated August 2026 · Alpine Exteriors · WA contractor license ALPINI751OW

The Short Answer

For most homeowners in Skagit, Island and Whatcom counties, composite decking is worth the extra upfront cost if you plan to keep the house more than five or six years and you're tired of annual maintenance. It is not automatically the right call for every deck, every budget or every homeowner, and the honest answer depends more on how you use the space and how long you'll own the property than on any universal rule.

Composite has become the default recommendation many contractors reach for first, and there's a reason for that, but "default" isn't the same as "correct for you." The rest of this page walks through what composite actually does well here, where it falls short, and how our own conditions in Mount Vernon, Anacortes, Burlington, Sedro-Woolley, La Conner, Stanwood, Camano Island and Bellingham change the calculation compared to a general national answer.

The Detail Behind It

Composite decking is a manufactured board, usually a blend of wood fiber and recycled plastic, often with a plastic "cap" layer bonded to the outside for extra protection. It's different from a cheap plastic-looking board from a decade ago — most mid-grade and premium composite today has real wood-grain texture and comes in a range of colors, and it's a genuinely different product from the raw wood-plastic boards that used to warp and fade badly.

The core argument for composite is maintenance. A cedar or pressure-treated deck needs periodic cleaning, sanding, staining or sealing to hold up, and skipping that maintenance is exactly how wood decks fail early around here — not from one bad storm, but from years of moisture sitting in unsealed grain. Composite doesn't need staining or sealing at all. You clean it, you check the fasteners and framing, and that's largely it. Over a fifteen-to-twenty-year window, that difference in labor and materials is real money and real weekends back.

The core argument against composite is cost and, for some homeowners, feel. Composite boards generally cost more per square foot installed than pressure-treated lumber, and depending on the grade, they can run close to or above cedar as well. We won't invent exact numbers here because pricing shifts with material availability and the size and complexity of the deck, but as a general pattern: pressure-treated lumber is the cheapest entry point, cedar sits in the middle with a nicer look but real upkeep, and composite spans a wide range from budget-grade boards that aren't much different in price from cedar up to premium capped composite that costs noticeably more. The payoff comes later, in avoided maintenance, not on install day.

There are other honest trade-offs worth naming. Composite can get warmer underfoot in direct summer sun than lighter-colored wood, though our summer afternoons here are milder than in much of the country, so this matters less than it would somewhere with sustained 90-degree heat. Darker composite colors will run hotter than lighter ones — something worth thinking through if the deck faces west and gets full afternoon sun with no shade structure. Composite also can't be sanded or refinished if it gets scratched or gouged the way wood can; a deep gouge is there for good. And while composite resists rot, it isn't immune to surface mildew or algae film in a climate that stays damp for months at a time — it just doesn't need staining to stay structurally sound the way wood does, but it still needs an occasional wash.

What Makes This Region Different

A composite decking decision made in Arizona or Texas doesn't transfer cleanly to Skagit, Island and Whatcom counties, and it's worth being specific about why.

• Heavy winter rain, month after month. Our wet season isn't a handful of storms — it's a long, steady soak from roughly November through February, with damp shoulder months on either side. This is where composite's rot resistance genuinely earns its keep, especially compared to a wood deck where a homeowner skips staining for a year or two and lets water sit in the grain.
• Moss and algae on shaded decks. Plenty of homes here, particularly under the mature fir and cedar canopy common around Sedro-Woolley, Burlington and the wooded lots outside Mount Vernon, have decks that see very little direct sun for much of the year. Shaded, damp wood surfaces grow moss readily. Composite resists the wood rot that moss growth accelerates on untreated lumber, but it is not moss-proof — a shaded composite deck will still need periodic cleaning to keep a green film from building up on the surface, so "low maintenance" should not be read as "no maintenance" in a shady yard.
• Wind off the Skagit flats and the Strait. The open farmland around the flats near Mount Vernon and La Conner funnels wind with little to break it, and island properties on Camano and near Anacortes catch steady wind off the water. This matters less for decking material choice and more for how a deck is built — fastener selection, railing attachment and framing all need to hold up to sustained wind loading, which is a construction detail more than a material one, but it's part of why we always look at the whole structure, not just the board choice.
• Salt air on the islands and near the water. Camano Island, Anacortes and waterfront lots around La Conner deal with airborne salt that accelerates corrosion on metal fasteners and hardware. This is arguably a bigger factor than the decking material itself — composite or wood, the fasteners, screws and any metal railing hardware need to be rated for coastal or marine exposure, or they'll rust and stain the deck surface well before the boards themselves are a concern.
• Occasional ice and snow in the foothills. Properties closer to the foothills east of Sedro-Woolley and Burlington see the occasional freeze, snow load and freeze-thaw cycle that lowland Mount Vernon and the islands mostly avoid. Composite handles freeze-thaw fine, but any deck in these areas needs footings set to the correct frost depth and a structure built to actually shed snow rather than trap it against the house.
• Washington State Energy Code. This applies most directly to enclosed or conditioned structures — a covered, heated three-season room built onto a deck, for example, falls under different requirements than an open deck. An open deck itself isn't an energy code item, but if a project includes a roof, walls or conditioned space, that's the point where the energy code and local building department requirements come into play, and it's worth flagging early rather than after design is finalized.

What the Homeowner Should Actually Do

Start with how you actually use the deck and how long you plan to stay. If this is a forever home or you're planning to be here a decade or more, the maintenance savings of composite compound in your favor, and it's a reasonable case for spending more upfront. If you're renovating to sell within the next year or two, a well-maintained wood deck or a mid-grade composite may make more financial sense than paying for premium composite you won't be around to enjoy the payoff on.

Look honestly at sun and shade. A deck that bakes in full afternoon sun all summer is a good candidate for a lighter composite color to avoid excess heat underfoot. A deck buried in shade under fir trees is going to need periodic washing no matter what material you choose, so don't pick composite there purely to "solve" moss — pick it because you don't want to sand and stain, and plan to still hose it off a couple of times a year.

Budget for the whole project, not just the boards. Framing, footings sized for our soil and frost conditions, fastener grade (especially near saltwater), and railing systems all affect both the cost and the long-term performance of the deck as much as whether the decking itself is wood or composite. A cheap composite board on an undersized frame with the wrong fasteners will disappoint you regardless of the material's reputation.

Get a couple of straightforward, side-by-side quotes — one for a solid pressure-treated or cedar build, one for composite — so you're comparing actual numbers for your specific deck rather than general internet pricing. Alpine Exteriors walks Skagit, Island and Whatcom county homeowners through that comparison as part of a normal deck estimate, because the honest answer really does change from house to house depending on layout, exposure and budget.

FAQ

Is composite decking slippery when it's wet?

Most modern capped composite boards include a textured surface specifically to improve wet-weather traction, and in general they perform comparably to sealed wood when both are wet. That said, any deck surface — wood or composite — gets slicker when it's coated in a film of algae or moss, which is exactly the risk on shaded decks here through our long wet season. Regular cleaning matters more for slip resistance than the choice of material.

Will composite decking fade or stain from moss and algae?

Composite won't rot the way untreated wood can from prolonged moss contact, but it can develop a green or black surface film in shaded, damp spots if it isn't cleaned periodically. It's a cosmetic maintenance item rather than a structural one — an occasional scrub or gentle power wash keeps it looking right — but it isn't accurate to call composite "maintenance-free" in a shady Skagit County yard.

How does composite decking hold up to salt air on Camano Island or near La Conner?

Composite boards themselves handle airborne salt well since they don't rust or corrode like metal. The bigger consideration on waterfront and island properties is the hardware — screws, fasteners, joist hangers and railing brackets — which need to be rated for coastal or marine exposure regardless of whether the decking is composite or wood. Standard interior-grade fasteners will corrode and stain the deck surface well before the boards are an issue.

Does a composite deck need to meet any specific code requirements in Skagit County?

An open deck is generally reviewed under standard residential building code requirements for framing, footing depth, guardrail height and ledger attachment, which apply the same way whether the surface material is wood or composite. The Washington State Energy Code becomes relevant if the project includes an enclosed or conditioned addition, such as a roofed, heated three-season room built off the deck — at that point it's a separate conversation from the decking material itself, and worth raising with your contractor and local building department early in the planning stage.

Talk to Alpine Exteriors About Your Deck

Whether composite makes sense for your specific deck depends on your budget, your sun exposure, how long you're staying, and where your property sits between the wet lowlands, the windy flats, the salt air of the islands and the foothills. Alpine Exteriors has walked homeowners across Mount Vernon, Anacortes, Burlington, Sedro-Woolley, La Conner, Stanwood, Camano Island and Bellingham through exactly this decision, and we're happy to give you a straight comparison for your own house rather than a generic pitch. Alpine Exteriors is licensed in Washington under contractor license ALPINI751OW — reach out for an honest, on-site look at your deck project.