Home Exterior Inspection Checklist for Anacortes & Skagit County Homes

Updated August 2026 · Alpine Exteriors · WA contractor license ALPINI751OW

Why This Checklist Matters in This Region

A house on Fidalgo Island or out on the Skagit flats near Mount Vernon, Burlington, or La Conner takes on weather differently than a house in a drier climate. Skagit County gets a long, wet fall-through-spring stretch with sustained rain rather than short, hard storms, and that steady moisture is what actually wears an exterior down — not any single dramatic event. Add to that the wind that funnels down the Skagit flats and off Rosario Strait and the Strait of Juan de Fuca near Anacortes, the salt air that reaches homes on Fidalgo Island, Camano Island, and along the water in La Conner, the shade from fir and cedar canopy that keeps north-facing roof slopes damp for days after a storm, and the occasional snow or ice event that reaches into the foothills toward Sedro-Woolley, and you have a specific set of conditions that a generic exterior checklist doesn't quite cover.

None of this is hurricane country, and there's no need to treat it that way. But sustained rain, wind, salt exposure, and shade-driven moisture each cause their own slow, specific damage, and catching that damage early is usually the difference between a $150 gutter cleaning and a $6,000 sheathing repair. This checklist is built around what actually shows up on homes in Mount Vernon, Anacortes, Burlington, Sedro-Woolley, La Conner, Stanwood, and Camano Island, and it's meant to be walked once in early fall (before the wet season sets in) and once in spring (to assess what the winter did).

The Checklist

Roof

• Moss and algae streaking, especially on north-facing or tree-shaded slopes. Shaded roofs under fir and cedar canopy — common on wooded lots around Anacortes and Sedro-Woolley — stay damp longer after rain, and moss roots work under shingle tabs and lift them.
• Lifted, cracked, curled, or missing shingles. Wind gusting off the Strait and across open ground near Anacortes and the flats can work edges loose over a season without one obvious failure point.
• Flashing around chimneys, skylights, and roof valleys. In a climate with this much cumulative wet-weather exposure, a flashing gap that would be a non-issue somewhere drier becomes a slow leak here.
• Water stains, dark spots, or a musty smell in the attic. This is often the first sign of a roof problem you can't see from the ground, and in a region with extended damp periods, hidden leaks can run for months before they show up inside.
• Granule loss in gutters or on the ground below roof edges. Heavy granule loss signals aging asphalt shingles that are losing their weather resistance faster than their age would suggest.

Gutters & Downspouts

• Needle and leaf buildup. Conifer needles are common on wooded lots throughout Skagit County, and a clogged gutter during a heavy fall rain event overflows almost immediately, sending water down the siding instead of away from it.
• Sagging sections or gutters pulling away from the fascia. Saturated debris is heavy, and repeated cycles of that weight stress the hangers over a wet season.
• Downspout discharge point. Confirm water is carried several feet from the foundation, not just dropped at the base of the wall — this matters more on the flatter ground around Mount Vernon, Burlington, and La Conner, where the water table sits closer to the surface and standing water drains slowly.
• Rust or corrosion on hangers, screws, and seams, particularly on homes closer to saltwater on Fidalgo Island or Camano Island, where salt air accelerates corrosion on unprotected metal.

Siding & Trim

• Cracked, warped, or delaminating siding panels. Repeated wet-dry cycling through a Skagit County winter and spring stresses siding materials at their seams first.
• Caulking and sealant at trim boards, corners, and window and door edges. Wind-driven rain finds gaps that look cosmetic but aren't; this is one of the most common entry points for moisture behind siding.
• Paint failure, chalking, or fading, especially on south- and west-facing elevations and on homes with direct water exposure, where sun and salt air both accelerate finish breakdown.
• Soft spots or discoloration at the bottom courses near grade, a common early sign of moisture wicking up from soil contact or splash-back.

Windows & Doors

• Drafts, fogging, or condensation between panes. A failed seal on a dual-pane window doesn't just mean discomfort — it means that window is no longer performing to the standard it was rated for, which matters under the Washington State Energy Code's requirements for the building envelope.
• Caulking and flashing above window and door heads. This is a frequent leak point during sustained rain, and it's easy to miss from the ground.
• Weatherstripping condition on all exterior doors, particularly entry doors facing the prevailing wind direction off the flats or the water.
• Operation and locking hardware. Swelling from moisture exposure is common in older wood-frame windows and doors in this climate and often shows up first as sticking.

Decks & Outdoor Structures

• Ledger board attachment to the house. This is the single most important structural connection on most decks, and it's also where water intrusion most often does hidden damage in a wet climate.
• Soft, spongy, or discolored decking boards. Untreated or aging wood decking absorbs moisture readily through a long wet season, and rot can progress from the underside before it's visible on top.
• Fastener corrosion, more pronounced on decks near saltwater on the islands and along the shoreline in La Conner and Stanwood.
• Railing and post stability, checked by hand, not just by eye.

Foundation & Drainage

• Grading around the foundation. Ground should slope away from the house; on the flatter terrain common around Mount Vernon and Burlington, poor grading shows up as standing water rather than obvious runoff.
• Standing water after a rain event, more than 24 to 48 hours after it stops. Persistent pooling near the foundation is worth tracking, not ignoring.
• Crawlspace vents and any visible moisture or mold, especially in older homes without vapor barriers, where sustained regional humidity has more opportunity to cause damage over time.

What to Do If an Item Fails

Not everything on this list requires an emergency call. A few missing granules, light moss on a shaded corner, or a bit of chalking paint are normal wear and worth noting for the next maintenance pass rather than panicking over. The distinction that matters is between cosmetic wear and anything that compromises a water-shedding surface or a structural connection.

If you find an active leak, a soft spot in decking or roof sheathing, a large gap in flashing, or a section of siding that's clearly let water behind it, the first move is to stop further water entry, not to fully repair it on the spot. A tarp over an active roof leak, temporary flashing tape, or simply keeping people off a soft deck board until it's assessed are reasonable stopgaps. Photograph what you find with a date reference — it helps whoever repairs it, and it helps if the issue turns out to be relevant to a homeowner's insurance claim.

Because this region's wettest months run roughly October through March, problems found in fall or winter tend to get worse before they get better if left alone; a small gap that lets in a trickle in November can be a saturated wall cavity by February. If you catch something during a spring inspection instead, you generally have more runway — late spring through early fall is the more reliable window for exterior repair work here, since materials, caulks, and coatings cure better in dry, moderate weather. Where possible, it's worth batching smaller repairs together for that window rather than addressing them one at a time as they come up.

When to Call a Professional

Some items on this checklist are reasonable for a homeowner to inspect from the ground with binoculars or from a stable ladder at gutter height. Getting onto a wet, moss-covered, or steep roof is not something to do without the right footing and fall protection — roofs in this region are wet far more often than they're dry, and moss makes surfaces slicker than they look. Leave roof-surface inspection and any repair work at height to a licensed contractor.

Beyond the safety question, a few findings genuinely warrant a professional opinion rather than a DIY fix: a soft or spongy spot on a roof deck or deck frame (a possible sign of structural rot), recurring moss that comes back within a season or two of cleaning (often a sign of inadequate roof ventilation or an aging underlayment, not just a cleaning problem), visible sagging in a roofline or deck ledger, or foundation cracks wider than a hairline. Window or siding replacement meant to actually improve energy performance should also go through a contractor familiar with current Washington State Energy Code requirements, since not every replacement product on the market meets the same standard.

Alpine Exteriors works on roofing, windows, decks, and gutters across Skagit, Island, and Whatcom counties, including Mount Vernon, Anacortes, Burlington, Sedro-Woolley, La Conner, Stanwood, Camano Island, and Bellingham, and holds Washington contractor license ALPINI751OW. A walk-through inspection from Alpine Exteriors can confirm which items on this list are cosmetic and which ones need attention before the next wet season.

FAQ

How often should I run through this checklist in Skagit County?

Twice a year works well for most homes here: once in early fall, before the heavy rain sets in, to catch anything that needs fixing while the weather still allows for repair work, and once in spring, to assess what the wet season actually did. Homes with heavy tree cover or close to saltwater may benefit from a quick gutter and roof check mid-winter as well, since needle buildup and wind exposure can add up faster in those conditions.

Why does the north-facing side of my roof grow moss faster than the rest?

North-facing slopes get less direct sun, so they dry out more slowly after rain, and in Skagit County that's frequently made worse by shade from fir and cedar trees on wooded lots around Anacortes and Sedro-Woolley. Moss and algae need sustained moisture to establish, and a shaded north slope simply stays wet longer than a sun-exposed south or west slope, especially through fall and winter.

We don't get hurricanes here — does wind off the flats and the Strait actually damage roofs and siding?

Yes, though differently than storm-force wind events elsewhere. The wind that moves across the open Skagit flats and off Rosario Strait and the Strait of Juan de Fuca near Anacortes tends to be sustained rather than a single violent gust, and it works on already-weakened points — a shingle tab loosened by moss roots, a piece of trim with failing caulk, a gutter hanger that's already stressed. Over repeated windy periods, that steady pressure finishes what moisture damage started.

If I replace windows or siding, does it have to meet the Washington State Energy Code?

Yes. New construction and most replacement work on the building envelope — windows, doors, insulation, and related components — falls under the Washington State Energy Code, which sets minimum performance requirements for things like window U-factor. If you're replacing failed or drafty windows anyway, it's worth confirming with your contractor that what's going in actually meets current code rather than just matching what was there before.

Get a Professional Walk-Through

If this checklist turns up more than a couple of items you're unsure about, or if you'd simply rather have a licensed set of eyes go through it once before the wet season arrives, Alpine Exteriors serves homeowners throughout Skagit, Island, and Whatcom counties — including Anacortes, Mount Vernon, Burlington, Sedro-Woolley, La Conner, Stanwood, Camano Island, and Bellingham — for roofing, windows, decks, and gutters. Contact Alpine Exteriors (WA contractor license ALPINI751OW) to schedule an exterior inspection and get a clear, honest read on what needs attention now and what can wait.