Home Exterior Inspection Checklist for Seattle Homeowners

Your home’s exterior is its primary defense against Seattle weather. Rain, wind, temperature swings, and biological growth place constant stress on the roof, siding, trim, and foundation. When one of these fails, moisture penetrates the wall cavity and framing. There it accumulates hidden damage for months, even years, before you notice it inside. By the time you notice a water stain or a musty smell, repair costs have often escalated from hundreds of dollars into thousands.

A systematic inspection routine catches problems early, while they are small and inexpensive to fix. It also helps you prioritize your spending, directing money toward the highest-risk areas first. In King County, annual rainfall averages 39 inches, and humidity stays elevated through fall and winter. In that climate, regular inspections are not optional; they protect your investment.

When to Inspect Your Home’s Exterior

Inspect the exterior twice a year. Do one in early spring (March or April), after the winter storms pass. Do the other in late fall (October or November), before our wettest months arrive. The spring inspection reveals damage from freeze-thaw cycles, wind, and heavy rain. The fall inspection ensures the roof, gutters, and drainage are ready for November through February, when King County receives most of its precipitation. We would rather you catch a soft sill in March than a rotted wall in July.

Add an inspection after any severe weather. A windstorm brings down branches and debris. Heavy snow can load a roof beyond its design. A prolonged rain saturates the soil and tests your drainage. If you see a water stain inside, smell something musty, or spot exterior damage, inspect right away. Do not wait for the next scheduled inspection.

Some homes need inspection more often. A house built before 1980 often has outdated flashing and no modern drainage plane behind the siding. A home under big trees accumulates debris in its gutters and valleys all year. A house on a slope, or with poor grading, can have persistent drainage problems that we would monitor every quarter.

Exterior Inspection Checklist by Component

Work through each component systematically, and document what you find with photos and notes. Use this checklist as your guide.

Roof and Roofing Materials

Inspect from the ground with binoculars, and from a ladder at the roof edge if you can do it safely. Look for missing, cracked, or curling shingles, particularly on south and west exposures where UV damage is greatest. Check that every shingle lies flat and is properly fastened. A wind-lifted shingle indicates a poor installation or age-related adhesive failure.

Examine the roof valleys and the areas around chimneys, vents, and skylights. These are high-stress zones where flashing failure is common. Look for gaps, rust, or separated seams in metal flashing. Inspect the base of each vent pipe for a cracked or missing rubber boot, which allows water to run directly into the attic.

Check for moss, algae, or debris accumulation. Moss holds moisture against the shingles and accelerates granule loss and decay. Heavy debris in a valley can dam the water, forcing it under the shingles and into the roof deck.

Note the overall condition of the roof. Heavy granule loss, visible wear, or a roof past 20 years may be approaching the end of its serviceable life. That holds even if it is not leaking yet.

Gutters and Downspouts

Clean gutters are critical to preventing water damage in Seattle. A clogged gutter overflows and saturates the fascia, the soffit, and the top courses of siding. Water that spills over the edge also lands near the foundation. That increases the risk of water intrusion into the crawl space.

Inspect gutters for clogs, sagging sections, and any separation from the fascia. A gutter should slope consistently toward the downspouts, with no standing water after rain. Look for rust spots or holes in metal gutters, and cracks or splits in vinyl ones.

Check the downspouts by running a hose into the gutter. The water should flow freely out the bottom. If it backs up, clear the clog or call a professional. Make sure the downspout extensions direct water at least 5-6 feet from the foundation. Water dumped right at the foundation saturates the soil and increases pressure against the foundation wall.

Fascia, Soffit, and Eaves

Fascia boards run along the roof edge and provide the mounting surface for gutters. They are highly vulnerable to rot, because rain runs off the roof onto them constantly. Inspect the fascia for soft spots, dark staining, and peeling paint. Look for gaps where the board has pulled away from the rafter tails.

Soffit panels close the underside of the roof overhang. They should be intact, with no gaps, cracks, or staining. Many soffits have vents that provide attic ventilation. Make sure these are not blocked by insulation, debris, or wasp nests.

Check the eaves for signs of water intrusion: dark streaks, mold, or rot under the overhang. These indicate water is running behind the gutter or fascia, and reaching the roof deck and framing.

Siding and Cladding

Walk the perimeter of your home and inspect the siding up close. Look for warped, cracked, or split boards, particularly on south and west walls where sun and wind stress is greatest. Check the paint too. Peeling, bubbling, or flaking paint indicates moisture behind the finish.

Press on the siding with your thumb in any suspect area. Soft or spongy siding suggests rot beneath the surface. Look hardest near grade, around windows and doors, and at the inside and outside corners where water tends to collect.

Look for gaps between the siding courses, which allow water and pests into the wall cavity. Check that the bottom course sits at least 6-8 inches above soil, mulch, or hardscaping. Siding in direct contact with the ground wicks moisture and decays rapidly. That last one is the single most common thing we find, and it is the easiest to prevent.

Look for biological growth: moss, algae, and mildew appear as green, black, or brown staining on the siding. These indicate areas that stay damp and never dry fully between rain events. North-facing and shaded walls are the most susceptible.

Trim, Corners, and Penetrations

Trim is the detail work covering joints and transitions, and it is often the first place moisture intrusion occurs. Inspect the window and door casings for soft wood, peeling paint, and gaps between the trim and siding. Press on the bottom corners of the window trim, where rot commonly begins. If we had to check one thing on an older Seattle home, it would be those corners.

Inspect the corner boards for separation from the siding, dark staining, and soft spots. Inspect every penetration: dryer vents, the meter base, hose bibs, and exterior lights. Verify the caulk around each one is intact, not cracked or missing.

Examine the horizontal trim surfaces, like window sills and water table boards. These are shelves where water sits, so they are among the highest-risk areas for dry rot. Watch for cupped or checked wood, paint failure, and standing water after rain.

Foundation and Below-Grade Areas

Inspect the foundation perimeter for cracks, settlement, or water staining. A vertical crack wider than 1/8 inch, or a horizontal crack of any width, should be evaluated by a structural engineer. Watch for efflorescence, the white chalky deposit that indicates water moving through the concrete.

Check the grading around the home. The soil should slope away from the foundation at a 5 percent grade, roughly a 3-inch drop over 5 feet. Flat or reverse-sloped grading directs water toward the foundation, increasing the risk of intrusion into the crawl space.

Inspect the foundation vents in the crawl space. They should open and close freely, and they should not be blocked by plantings, debris, or storage items. Verify the window wells are clear and draining at the bottom.

Decks, Porches, and Exterior Structures

Inspect the deck ledger board, where the deck attaches to the house. Poor or missing flashing here allows water to flow into your framing, often causing extensive hidden damage. Look for gaps, rust on fasteners, and soft wood around the connection.

Walk the deck surface and note any spongy or bouncy areas. Check the railings and posts for stability. Inspect the underside for rot, particularly at the beam-to-post connections and joist ends. Watch for fungal fruiting bodies, the mushroom-like growths that indicate advanced decay.

Check the stairs for secure attachment and solid treads. Inspect beneath the stairs, where moisture and debris accumulate and ventilation is poor.

Documenting and Prioritizing Findings

Take photos of every issue you identify, with close-ups for detail and wider shots for location. Note the date. Then create a simple list with columns for the location, a description, its severity, and an estimated repair timeline.

Prioritize the issues into three categories:

Immediate (repair within days): active leaks, missing or damaged flashing, soft wood in structural areas, gaps that allow water into the structure, and gutters that overflow or have separated from the fascia.

Near-term (repair within 1-3 months): Failed caulk around windows and doors, damaged or missing shingles, peeling paint on trim, minor siding damage, and clogged or sagging gutters.

Long-term (monitor and plan for future repair): cosmetic paint wear, minor surface cracks in siding, aging but intact roofing, and routine maintenance items like gutter cleaning and resealing.

When to Call a Professional

You can perform a visual inspection of the accessible areas. But a professional brings expertise and tools that go beyond surface observation. We use a moisture meter to detect hidden water in the wall cavities. Thermal imaging locates insulation gaps and moisture intrusion, and roof access reveals what you cannot see from the ground. You can catch most of this yourself with a ladder and a thumb. The hidden moisture is where we earn our keep.

We recommend a professional inspection annually, even when your own inspections reveal nothing. Some problems are not detectable to the naked eye: early dry rot, moisture inside the walls, and failing flashing. These require specialized tools and experience to detect.

If your inspection reveals extensive damage, structural concerns, or problems you cannot safely access, schedule a professional evaluation before attempting repairs. A local contractor who knows Pacific Northwest moisture can identify the root cause, not just the symptom, and recommend solutions that prevent recurrence.

Contact our team at (425) 517-1751 for a free professional exterior inspection if your checklist reveals areas of concern or if you want an expert assessment of your home’s condition.