How long does it typically take to build a new deck?

A straightforward deck of standard size usually takes about one to two weeks from the start of framing to final cleanup, depending on size, material, and weather delays. Larger or multi-level designs, or anything with extensive railing or built-in features, can take longer. Permit approval timelines also factor into the overall schedule and are worth asking about upfront.

What should I ask a contractor before hiring them to build a deck near the border?

Ask whether they carry current insurance and coverage that applies to work in the province, how they handle permitting with the local municipality, and whether they'll put the material spec and fastener choices in writing before work starts. A contractor who can explain those details clearly, rather than giving vague answers, is generally the safer hire.

What's the real difference between capped composite and standard composite decking?

Capped composite has a protective outer layer bonded to the board that resists moisture absorption, staining, and fading far better than older, uncapped composite products, which could absorb water at the surface over time. Most composite decking sold today is capped, but it's still worth confirming with any product a contractor is proposing rather than assuming.

Do hidden fastener systems actually make a difference, or are they mostly cosmetic?

They're mostly about performance, not just looks. Exposed screw heads on the deck surface create small points where water can sit and eventually track into the board, and in salt-influenced air they're also the first place corrosion staining shows up. Hidden fastener systems reduce both issues, though they typically add some cost and require decking that's designed to accept them.

Does building on the Canadian side of the border change the deck design compared to a similar home in Whatcom County?

The climate drivers, salt air, rain, and moss, are essentially the same on both sides, so the framing and material approach doesn't change much. What does change is the permitting process and the specific building code requirements, which follow the Township of Langley on the BC side rather than a Washington jurisdiction. We build to whichever set of requirements applies to the property.

Deck Building in Aldergrove, BC — Built for Border Weather

Deck Building in Aldergrove, BC: Built for the Weather This Corner of the Border Sees

Aldergrove sits just a few minutes north of the Washington border, close enough to Lynden that our crews are back and forth across that line regularly for exterior work. The weather doesn't change much crossing from one side to the other. Homes in this stretch of the Fraser Valley and northern Whatcom County both sit under the same marine-influenced weather pattern: salt-tinged air moving in off the Strait of Georgia and Boundary Bay, driving rain that comes in sideways as much as it falls straight down, and a moss and mildew season that can run most of the year on shaded lots. A deck takes more of that than almost anything else on a property, because it's a horizontal surface exposed to the sky, sitting low to the ground, and often shaded by fences, trees, or the house itself. This page is about what that means for a deck built specifically for an Aldergrove property, and what a correctly built one actually involves.

What a Deck in This Climate Actually Deals With

Salt Air and Corrosion

Even well away from open water, the Fraser Valley and northern Whatcom County both see a steady dose of salt-carrying marine air. That air accelerates corrosion on anything metal — fasteners, joist hangers, railing hardware, post bases. A deck built with standard, uncoated hardware in this climate will show rust streaking and weakening connections years before it should. The fix isn't complicated, but it has to be planned for from the framing stage, not added as an afterthought.

Driving Rain and Standing Water

Wind-driven rain pushes moisture into places a straight-down rainfall never would — under railings, behind ledger boards, into the narrow gaps between decking planks. On a horizontal surface, water also has nowhere to go but down through the structure or off the edge, so drainage and slope matter as much as the decking material itself. A deck that doesn't shed water correctly stays wet longer after every storm, and in this climate, storms are frequent enough that "longer" adds up fast over a season.

A Moss Season That Doesn't Really End

Mild temperatures, consistent moisture, and shade from mature trees or nearby structures add up to a moss and algae season that can run nearly year-round on north-facing or heavily shaded decks. Horizontal wood surfaces are prime territory for it, especially where boards sit tight together or where debris collects in the gaps. Moss on a walking surface isn't just unsightly — it holds moisture against the wood and gets slippery underfoot, which is a real safety issue on stairs and landings.

What Correct Deck Framing Looks Like Here

The framing is where a deck's long-term performance actually gets decided. Decking boards get replaced eventually no matter what; a poorly built frame underneath them fails in ways that are far more expensive to fix. A few things we treat as non-negotiable on every deck we frame in this area:

Ledger flashing: Where the deck attaches to the house, the ledger board needs proper flashing that directs water away from the wall assembly, not just a bolted board with caulk as the only barrier.
Corrosion-resistant hardware: Hot-dip galvanized or stainless fasteners, joist hangers, and post bases throughout, matched to the treated lumber they're fastened to so the metals don't react against each other.
Footings set below the frost line: Post footings need to be poured to the depth your local building code specifies for this area, not just deep enough to look solid. Shallow footings are one of the more common causes of a deck that shifts or heaves over a few winters.
Grading and drainage beneath the deck: The ground under a low deck needs somewhere for water to go. Without it, that space stays damp season-round and becomes exactly the kind of environment that grows moss, mildew, and eventually rot in the framing above it.
Proper joist spacing for the decking material: Composite and PVC boards often need tighter joist spacing than solid wood to avoid flexing or long-term sagging between supports — that spec comes from the manufacturer, and skipping it voids the warranty even if the deck looks fine on install day.

Choosing Decking Material for an Aldergrove Property

There's no single "right" decking material for every home — it depends on budget, how the deck will be used, how much shade the lot gets, and how much upkeep the homeowner actually wants to do. Here's how the common options compare in this specific climate:

Material	Moisture & Moss Resistance	Maintenance	Typical Lifespan
Pressure-treated wood	Good if sealed regularly; end grain and fastener holes are vulnerable points	Annual cleaning, periodic sealing or staining	15–20 years with upkeep
Cedar	Naturally rot-resistant but softer and more porous than PT lumber	Regular sealing to maintain color and moisture resistance	15–20 years with upkeep
Capped composite	Strong — the cap layer resists moisture absorption and staining better than wood	Occasional washing, no sealing or staining required	25–30 years, often warrantied
PVC decking	Best moisture resistance of the group; fully synthetic, no organic material to feed rot	Lowest — washing only	25–30+ years, often warrantied

In a climate with this much sustained moisture and a long moss season, we generally steer homeowners toward capped composite or PVC for decking that stays wet often — low decks, shaded lots, north-facing exposures — and treat solid wood as a good option where the homeowner wants that look and is committed to the maintenance schedule that keeps it performing. Neither choice is wrong; the trade-off is upfront cost against long-term upkeep, and we lay that out plainly rather than pushing whichever product costs more.

Solving the Moss Problem Through the Build, Not Just Cleaning

A lot of moss and mildew problems on decks aren't really a cleaning problem — they're a building problem that cleaning only masks for a few months at a time. Board spacing that allows for drainage and airflow between planks, rather than tight-fit installation, keeps debris and standing moisture from collecting in the gaps. On low decks, skirting with vents or gaps rather than sealing the space solid lets air move underneath and keeps that zone from staying permanently damp. End grain on solid wood decking should be sealed at cuts, since raw end grain absorbs moisture far faster than the face of the board. None of this eliminates the need for occasional cleaning, but it changes how often you need to do it and how much moss actually establishes itself between cleanings.

Railings, Fasteners, and Hardware That Actually Hold Up

Railings take a lot of handling and weather exposure at the same time, which makes hardware choice matter more than it might seem. We use hidden fastener systems where the decking product supports them, both for appearance and because exposed screw heads are a common entry point for moisture and an early spot for corrosion staining in salt-influenced air. Guard rail height and baluster spacing need to meet the building code that applies to the property, and on a deck of any real height off grade, that's not optional — it's a safety requirement we build to regardless of what a homeowner might have seen on an older deck nearby.

Our Deck Building Process, Start to Finish

Every deck we build follows roughly the same sequence, adjusted for the specific lot and design:

Site visit and assessment: We look at grade, drainage, sun and shade exposure, and how the deck will connect to the house before talking materials or design.
Design and material selection: We walk through decking, railing, and framing options with the homeowner, including the honest trade-offs between them, and settle on a plan that fits the budget and how the space will actually be used.
Permitting: Most new deck construction requires a permit from the local municipality. We handle or coordinate that process so the homeowner isn't stuck figuring out requirements on their own.
Footings and framing: Footings are set to the required depth, and the frame goes up with corrosion-resistant hardware and proper ledger flashing where the deck ties into the house.
Decking and railing installation: Boards and railing go on per the manufacturer's spacing and fastening spec, not shortcuts that happen to look right on day one.
Final walkthrough and cleanup: We walk the finished deck with the homeowner, check for anything that needs adjustment, and clear the site of construction debris before we consider the job done.

Permits and Building for Both Sides of the Border

Aldergrove falls within the Township of Langley, and most new deck construction there — especially anything elevated or attached to the house — requires a building permit before work starts. That's a step some homeowners try to skip on a smaller project, and it's not worth the risk: an unpermitted deck can create real problems at resale or insurance time, well after the build itself is finished and forgotten. Because our crews work regularly on both sides of the border, we're used to navigating the permit process on the Canadian side as part of the job, not treating it as a separate hurdle the homeowner has to clear alone.

Deck Maintenance Checklist for Aldergrove Homeowners

A well-built deck still needs some seasonal attention to get its full lifespan out of this climate. A few things worth checking once or twice a year:

Clear leaves, needles, and debris from between boards and along the base of railings before wet weather sets in
Check for moss or algae buildup on shaded sections and wash it off before it has a chance to establish
Look at fastener heads and hardware for early rust staining, which usually shows up before any structural issue does
Inspect the ledger board connection to the house for gaps, staining, or soft wood, which can signal a flashing problem
Reseal or restain solid wood decking on the schedule the product calls for — usually every one to two years depending on sun exposure
Confirm the space under a low deck is still draining and hasn't become a standing-water pocket over time

Why Hiring a Crew That Already Works Aldergrove Matters

A contractor who builds decks across this specific area, on both sides of the border, has already seen how salt air, driving rain, and a long moss season actually play out on real decks over several years — not just how a product performs on a spec sheet. That experience shapes practical decisions: which lots need extra drainage attention under a low deck, which orientations stay damp longest, and which hardware upgrades are worth the small added cost because the alternative is a callback in a few years. It also means one crew that understands both the Canadian and Washington sides of permitting and code, rather than a contractor who only works occasionally in the area and is learning the local requirements on your project.

If you're planning a new deck or need to replace one that's past its useful life, we're glad to take a look at your property and walk through honest options for framing, decking material, and design. Reach out using the form below to schedule a free, no-pressure estimate.