Home Exterior Inspection Checklist for La Conner, Skagit County

Updated August 2026 · Alpine Exteriors · WA contractor license ALPINI751OW

Why This Checklist Matters in This Region

La Conner sits low on the Skagit flats, right where the Swinomish Channel meets open farmland and, a few miles west, the salt air off the Strait of Juan de Fuca and Puget Sound. That combination is harder on a house than most homeowners realize. Winter storms push steady wind across the flats with almost nothing to break it, and that wind arrives alongside months of sustained rain rather than short, hard downpours. Water doesn't just fall here, it lingers — on roofs, in gutters, against siding, and around foundations — for days at a time between breaks in the weather.

Shaded north-facing roof slopes, common under the fir and cedar cover found around La Conner, Fir Island, and the wooded lots toward Pleasant Ridge, stay damp long after the sun returns, which is exactly the environment moss and moisture-loving algae need to take hold. A short drive toward Anacortes or Camano Island adds a salt-air component that accelerates corrosion on fasteners, flashing, and gutter hardware, even though this area never sees the storm-surge or hurricane-force events that coastal Gulf and Atlantic states plan for. Our concerns are steady wind-driven rain, moss, freeze-thaw cycling during the occasional cold snap, and condensation-related moisture inside wall assemblies — not tropical wind ratings.

Washington's building code also plays a real role in how a home should perform here. The Washington State Energy Code sets minimum requirements for insulation, air sealing, and window performance in new construction and many remodels, and it's a useful reference point when you're evaluating whether aging windows, doors, or attic insulation are still doing their job. A home that was built to an older code, or that has settled and gapped over twenty or thirty years, will often show it first at the exterior envelope — which is exactly what this checklist walks through.

Doing a seasonal walk-around, ideally once in early fall before the heavy rains set in and again in spring, catches small problems while they're still small. A lifted shingle, a clogged downspout, or a hairline gap around a window casing costs little to address on its own. Left through a wet Skagit County winter, the same issue can lead to rot, interior water stains, or a failed subfloor on a deck. None of this requires special tools or training to check — just a ladder, good light, and a bit of patience. Where an item points to something beyond a visual check, we say so.

The Checklist

Roof

• Moss or algae streaking on shaded slopes: north-facing sections under tree cover hold moisture longest and are the first place moss establishes itself in this climate.
• Lifted, cracked, or missing shingles/shakes: sustained wind off the flats can work edges loose over time even without a single dramatic storm.
• Granule buildup in gutters or at downspout outlets: heavy granule loss signals asphalt shingles are aging faster than their remaining warranty years suggest.
• Flashing around chimneys, vents, and skylights: these transitions are the most common point where wind-driven rain finds a way in.
• Sagging ridgelines or soft spots underfoot (viewed from a ladder, not walked on): can indicate long-term moisture damage to the roof deck below.

Gutters and Downspouts

• Debris buildup, especially after fall leaf drop: clogged gutters overflow directly against fascia and siding during the long rain stretches typical here.
• Sagging sections or pulled-away hangers: standing water adds weight that accelerates hanger failure, especially on older gutter systems.
• Downspouts discharging right at the foundation: in low-lying areas like much of La Conner and the Fir Island floodplain, this is a direct path to basement or crawlspace moisture.
• Rust or pitting on metal gutters near the water: salt air toward Anacortes, Camano Island, and the Swinomish Channel shoreline speeds up corrosion on unprotected metal.

Windows and Doors

• Cracked, dried, or missing exterior caulk and weatherstripping: gaps here are a leading cause of both water intrusion and the drafts that undercut Washington State Energy Code insulation performance.
• Fogging or moisture between double-pane glass: indicates a failed seal, which is a comfort and energy issue even if it isn't leaking water yet.
• Soft or discolored trim and casing: often the first visible sign of water getting behind window flashing.
• Doors that stick, drag, or no longer latch cleanly: can point to frame settling or swelling from moisture absorption.

Decks and Outdoor Structures

• Soft, spongy, or discolored decking boards: a near-constant wet season means untreated or aging wood decking can hide rot beneath a sound-looking surface.
• Rust streaks around fasteners or connectors: a sign that hardware isn't holding up to the moisture and, on island or shoreline properties, the salt air.
• Loose or wobbly railings: a safety issue first, but also often a sign of post rot at the base.
• Ledger board attachment to the house: this connection point is where most structural deck failures start and deserves a close look, not a glance.

Siding and Trim

• Bubbling, peeling, or discolored paint: usually means moisture is trying to escape from behind the siding.
• Gaps or cracks at seams, corners, and where siding meets trim: wind-driven rain finds these openings over a wet winter.
• Warped or delaminating panels, especially near ground level: splash-back from rain-soaked landscaping accelerates this near foundations.
• Green or black staining in shaded corners: the same moss and algae growth pattern seen on roofs shows up on north- and east-facing siding under tree cover.

Foundation and Drainage

• Standing water near the foundation after rain: common on the flat, low-elevation lots typical of La Conner and nearby Fir Island, and worth addressing before it reaches a crawlspace.
• Grading that slopes toward the house rather than away: even a small negative slope concentrates water exactly where you don't want it.
• Cracks in the foundation wall or slab: hairline cracks are common and often cosmetic, but wider or actively widening cracks warrant a closer look.
• Musty odors or visible mold in a crawlspace: a sign that exterior drainage or ventilation issues have already become an interior moisture problem.

What to Do If an Item Fails

Not every item on this list means a major repair. A gutter full of maple leaves just needs cleaning. Dried-out caulk around a window can often be scraped out and replaced with a quality exterior sealant in an afternoon. Light moss on a roof can sometimes be slowed with a gentle, non-pressure treatment and better airflow from nearby tree trimming, though established moss on an aging roof often signals that the roof covering itself is nearing the end of its useful life.

Where the answer isn't obvious, resist the urge to guess. A soft spot on a deck board might be isolated surface damage, or it might mean the joist beneath it has been absorbing water for a season or two. Discolored trim could be surface weathering, or it could be the visible edge of a much larger area of hidden rot behind the siding. Photograph what you find, note the date, and if there's any doubt about how far a problem extends, have it looked at before painting over it, caulking over it, or otherwise covering it up. Covering a moisture problem without resolving it is one of the most common ways a manageable repair becomes a much larger one by the following winter.

Keep a simple written or photo record of what you check each season. In a climate where damage develops gradually over multiple wet seasons rather than in a single dramatic event, a year-over-year comparison is often more useful than any single inspection on its own.

When to Call a Professional

Some findings are worth a second opinion regardless of how minor they look from the ground. Anything involving the roof deck, structural framing, deck ledger connections, or foundation cracking is worth having assessed by someone who does this work regularly, both for safety and because misdiagnosing the cause can lead to fixing the wrong thing. Working at height on a wet, moss-covered roof also carries real fall risk that isn't worth taking on solo.

It's also worth calling in a contractor when you find a pattern rather than a single isolated item — several soft deck boards, moss returning every year despite cleaning, or recurring moisture in the same interior room. Patterns usually point to one underlying cause, and addressing the individual symptoms without finding that cause tends to be a cycle of repeated repairs. Alpine Exteriors serves La Conner along with the rest of Skagit, Island, and Whatcom counties, including Mount Vernon, Anacortes, Burlington, Sedro-Woolley, Stanwood, Camano Island, and Bellingham, and can walk a property to sort out which items are routine maintenance and which need a repair or replacement plan. As a Washington-licensed contractor (license ALPINI751OW), Alpine Exteriors can also speak to how any proposed work lines up with current Washington State Energy Code requirements where that's relevant, such as window replacement or added insulation.

FAQ

How often should I do a full exterior inspection in La Conner?

Twice a year covers most homes well here — once in early fall before the heavy rain season sets in, and once in spring after winter storms and any freeze-thaw activity have had their effect. Homes on shaded, moss-prone lots or right along the water may benefit from an additional quick check partway through winter, particularly after any unusually windy stretch.

Is moss on my roof actually a problem, or just cosmetic?

It's more than cosmetic. Moss holds moisture directly against the roofing material and can work its way under shingle edges as it grows, which shortens the life of the roof covering. Light, early-stage moss can often be managed with gentle treatment and improved sunlight or airflow, but a heavily mossed, aging roof is often a sign the roof itself needs a closer evaluation rather than just a cleaning.

Do I need to worry about wind damage the way coastal states worry about hurricanes?

No — this region doesn't see hurricane conditions, so there's no need for hurricane-rated products or storm-surge planning. The wind concern here is more gradual: sustained wind off the Skagit flats and the Strait can work loose fasteners, lifted shingle edges, or aging caulk over repeated storms across a season, rather than causing sudden catastrophic damage in a single event.

My windows are original to the house from the 1990s. Should I be checking anything specific?

Yes. Check the seals between panes for fogging, which indicates seal failure and lost insulating performance, and check the exterior caulk and weatherstripping for cracking or gaps. Windows from that era often fall well short of current Washington State Energy Code performance targets, so beyond moisture concerns, aging windows are frequently a source of real energy loss worth factoring into any renovation planning.

Ready for a Second Set of Eyes?

A DIY walk-around catches a lot, but some issues — a questionable roof deck, a deck ledger connection, or a pattern of recurring moisture — are worth a professional look before they turn into a bigger project. Alpine Exteriors works throughout La Conner and the rest of Skagit, Island, and Whatcom counties on roofing, windows, decks, and gutters, and can walk your property with you to sort routine maintenance from items that need attention. Reach out to schedule an exterior inspection and get a straightforward assessment of where your home stands.