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

Most residential deck projects take one to three weeks from the start of framing to final finish work, depending on size and whether it's a single-level or multi-level design. Permitting time is separate and can add several weeks before construction starts, so we factor that into the overall schedule during the estimate.

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

Ask whether they pull permits themselves, what fastener and flashing standards they use, and whether they'll explain the footing depth for your specific soil rather than a generic number. A contractor who can walk you through those details without hesitation has done the work before and knows why it matters.

What's the real difference between composite and PVC decking?

Both resist moisture better than wood, but PVC (fully synthetic, no wood fiber) tends to handle constant moisture and moss exposure slightly better than composite, which blends wood fiber with plastic. Composite is generally less expensive upfront, while PVC costs more but needs less long-term attention in a consistently damp climate.

Do all composite decking brands perform the same way?

No — cap thickness, the quality of the protective outer layer, and warranty terms vary meaningfully between manufacturers. We stick to lines with a solid track record for moisture and mold resistance rather than picking based on price alone, since a thin or poorly capped board will show moss and staining much sooner.

Does Sumas' climate affect how decks should be built differently than in drier parts of Washington?

Yes — the long wet season and near-constant humidity across Whatcom County mean drainage, flashing, and fastener choices matter more here than in drier regions of the state. A deck detailed for a dry climate will show moss, rot, and hardware corrosion much sooner if it's built the same way in Sumas.

Custom Decks Built for Sumas' Rain and Moss

Decks in Sumas Face a Different Set of Problems

A deck built for a dry climate doesn't hold up the same way out here. Sumas sits inland from the coast, but it still gets the full weight of Whatcom County's wet season — long stretches of steady rain from fall through spring, humidity that never really drops, and shaded corners of a yard that stay damp for days after a storm passes. Add in the moisture-laden air that moves in off the Sound and settles across the county, and you've got conditions that are hard on any exterior structure, decks included.

The result shows up as moss on the boards, soft spots where water sits too long, corroded fasteners, and railings that loosen a year or two before they should. None of that is inevitable. It's mostly a matter of whether the deck was built with this climate in mind or just built to a generic plan. We build for the second kind of house — the one that has to survive a Whatcom County winter every single year, not just look good on installation day.

What a Sumas Deck Actually Needs

Drainage Comes First

Before we talk about decking material or railing style, we look at where the water goes. A deck that traps moisture underneath — because of poor grading, blocked airflow, or ledger flashing that wasn't done right — will grow moss and rot from the inside before the surface ever shows it. Correct board spacing, joist protection, and a ledger connection that actually sheds water instead of feeding it into the house rim joist are not optional extras. They're the difference between a deck that lasts fifteen years and one that needs major repair in five.

Footings Built for Local Soil and Frost

Whatcom County doesn't get the deep freeze some inland regions do, but it does get frost, and soil conditions vary a lot from lot to lot around Sumas — some properties sit on well-drained ground, others hold water much longer. We size and set footings based on what's actually under the yard, not a one-size-fits-all depth. Skipping this step is one of the more common causes of a deck that develops a slope or a bounce within a few years.

Choosing a Decking Material That Fits the Climate

There's no single "best" decking material — there's a best material for what a specific homeowner wants to maintain, and how much moss and moisture exposure the site actually gets. Here's how the common options compare for a Sumas property:

Material	Moss & Moisture Behavior	Maintenance	Typical Lifespan	Relative Cost
Pressure-treated wood	Absorbs moisture; needs sealing to resist moss and staining	Annual cleaning, re-sealing every 1-3 years	10-15 years	Lowest upfront
Cedar	Naturally more rot-resistant, still needs sealing in a wet climate	Regular cleaning, periodic oil or sealant	15-20 years with upkeep	Mid-range
Composite	Doesn't absorb water like wood; still needs surface cleaning to prevent moss film	Occasional wash, no sealing or staining	25-30 years	Higher upfront
PVC / capped decking	Fully moisture-resistant surface; best resistance to moss buildup	Rinse or wash a couple times a year	25-30+ years	Highest upfront

We won't tell a homeowner that one of these is "wrong" — each is a legitimate trade-off between upfront cost and long-term maintenance. What we will do is walk through how much sun and shade a particular deck footprint gets, because a heavily shaded deck in Sumas will grow moss on any material faster than one that gets afternoon sun, and that should factor into the choice.

The Parts of the Job Most Homeowners Never See

A deck that looks fine from the yard can still be failing underneath. The details that actually determine how a deck performs through a Whatcom County winter are mostly hidden once construction is done:

Ledger board flashing installed so water is directed away from the house wall, not into it
Joist tape or flashing on top of every joist to stop water from soaking into end grain
Corrosion-resistant, code-rated fasteners and hardware — standard exterior screws corrode faster in this moisture
Board spacing set for airflow and drainage, not just visual tightness
Post bases that keep wood off standing water instead of sitting flush with grade

None of this is visible once the decking boards go down, which is exactly why it matters who's doing the work before that point. A deck can look identical on the surface and perform completely differently five winters later depending on whether these steps were done correctly.

Design Choices That Make Sense for Sumas Properties

Lot layouts around Sumas vary — some homes sit on flatter parcels, others have a grade change that makes a multi-level deck the more practical option. Multi-level designs need extra attention to stair stringers, railing height compliance, and how each level sheds water onto the one below it, so a design that looks straightforward on paper can get complicated fast once drainage and code requirements are factored in.

Railing choice matters too. Wood railings need the same sealing schedule as wood decking, while metal or composite railing systems hold up with less upkeep but cost more initially. We size this into the plan based on how much maintenance a homeowner actually wants to take on year after year — there's no wrong answer, just an honest one.

Our Process, Start to Finish

Site visit and estimate — we look at the yard, the grade, sun exposure, and existing structure before proposing anything
Design and material selection — footprint, levels, railing, and decking material chosen together, not separately
Permitting — decks over a certain height or attached to the home typically require a permit; we handle that process
Footings and framing — sized for the actual soil and frost conditions on the property
Flashing, joist protection, and decking installation — the hidden work that determines long-term performance
Railing, stairs, and finish work
Final walkthrough — so the homeowner understands the maintenance schedule for whatever material was chosen

Moss Season and Long-Term Upkeep

Moss doesn't mean a deck was built wrong — it means the deck is doing what any exterior wood or composite surface does in a climate this damp for months at a stretch. The difference between a deck that stays in good shape and one that quietly deteriorates is whether moss and moisture are dealt with on a schedule instead of ignored.

A soft power wash (never a pressure setting that can gouge the wood or strip a composite cap) once or twice a year, kept up before moss gets a thick foothold, goes a long way. Wood decks need re-sealing on a regular cycle to keep water from working into the grain; composite and PVC decks mostly need to stay clean so moss doesn't get a surface to grip. We go over the specific schedule for whatever material is installed so it's not guesswork.

Signs an Older Deck Needs Attention Before Moss Season

Boards that feel spongy or flex more than they used to
Green or black film building up faster than a rinse can remove
Rust streaks around fasteners or hardware
Gaps opening up between the ledger board and the house
Railings that wiggle at the post connections

Any of these is worth a look before winter rain sets in, not after.

What Affects the Cost of a Sumas Deck Project

Every deck is priced around the specifics of the property and the homeowner's choices, so we don't quote broad numbers without seeing the site — but the main variables are consistent:

Overall size and footprint
Single-level versus multi-level design
Decking material selected (see the comparison above)
Railing type and code requirements for height
Site access and grade — a steep or hard-to-reach yard adds labor time
Permit requirements based on height and attachment to the home

We go through all of this in the estimate itself, so a homeowner understands exactly what's driving the number rather than getting a flat quote with no explanation behind it.

Why It Matters That We Already Work in Sumas

A crew that's used to building in a different kind of climate will often default to whatever detailing works fine somewhere drier — lighter flashing, standard fasteners, less attention to drainage — because that's what they know. That approach doesn't hold up here. Working regularly in Sumas and across Whatcom County means we already know how the local soil drains, how long moss season actually runs, and which details can't be skipped even though they add a little time to the job. It also means we're not learning the local permitting process on a homeowner's project — we've already been through it.

That familiarity shows up less in how a new deck looks on day one and more in how it performs on year eight, when the shortcuts a less-experienced crew might have taken would already be causing problems.

If you're planning a new deck or replacing one that's showing its age, we're happy to take a look and put together a straightforward, no-pressure estimate — just fill out the form below.