Home repair in Seattle, WA

Seattle homes at a glance

Median year built

1976

Built before 1960

38%

Built since 2000

33%

Owner-occupied

44%

Median home value

$938,600

Main heat

Electric, 61%

Source: U.S. Census Bureau, American Community Survey 2024 1-year estimates

What Seattle’s housing means for repairs

Seattle's housing splits between old and new. About 38% of homes predate 1960, mostly Craftsman and Tudor houses with basements, knob-and-tube wiring and old cast iron drains, while 33% went up after 2000, much of it townhouses and apartments. The median build year is 1976.

Only 37% of homes are detached single-family houses, and 44% are owner-occupied. Electric heat covers 61% of homes and gas 33%. About 3% still burn oil, and many more once did, so buried heating oil tanks still turn up during sales and remodels. At a median home value of $938,600, owners tend to repair and upgrade rather than move, which keeps heat pump installs and window replacements busy.

Weather that wears on Seattle homes

Seattle's rain season runs from fall through spring as long stretches of drizzle rather than downpours. The steady moisture grows moss on roofs, clogs gutters with needles and leaves, and rots wood decks and fence posts. Basements on hillsides take on water when drains clog. Summers are dry and getting warmer, and the 2021 heat dome showed how few homes had cooling, which is why heat pumps that also cool are in demand. Wildfire smoke from the region fills the air in late summer. Snow is rare but freezes still happen. The city sits on active faults, so bolting older homes to their foundations is a common retrofit.

Common repairs in Seattle

• Heat pump install or service

  Owners replace oil furnaces and baseboard heat with ducted or ductless heat pumps that also cool in summer.

• Roof moss and gutter cleanout

  Months of drizzle feed moss that lifts shingles and fills gutters with debris.

• Foggy or leaking double-pane windows

  Older vinyl windows lose their seals and let condensation build between panes.

• Deck boards and railings

  Wet winters rot deck boards and loosen railing posts on hillside homes.

• Mold cleanup after a leak

  Slow leaks in bathrooms and basements grow mold quickly in damp months.

What these repairs cost

The middle half of Runhome repair estimates nationwide for each kind of job. Your price depends on the scope of the work.

Fix guides for Seattle homeowners

• Ceiling is stained and sagging after a water leak

  In Seattle's wet season, a small roof or bathroom leak can stain and soften a ceiling before you notice it.

• Roof leaks in one spot and stains the ceiling below

  Moss-lifted shingles often leak in one spot during long rain stretches.

• Painted wood is rotten and crumbles when you press it

  Constant moisture rots painted trim on Craftsman porches and window sills.

• Water is leaking under the sink

  Leaks under sinks feed mold fast in damp Seattle kitchens and bathrooms.

Seasonal checklist

Fall

Clean gutters and downspouts after the leaves and needles drop, before the rain sets in.

Winter

Run bathroom fans during and after showers and check basement corners for damp spots.

Late summer

Change HVAC filters after wildfire smoke and service your heat pump before the cold.

Spring

Treat roof moss and check deck boards and railings for soft wood.

Common questions

Should I replace my old Seattle oil furnace with a heat pump?

Many owners do, because a heat pump also cools during heat waves. The price depends on whether you have ducts, how many rooms need heads for a ductless system and whether the electrical panel needs more capacity. If you stop using oil, plan for the old tank to be decommissioned.

How often should a Seattle roof have moss removed?

Check it every year, since moss grows through the wet months. Remove it before it lifts shingles, and keep gutters clear so water drains away from the eaves.

What makes window replacement cost more in an older Seattle house?

Custom sizes, wood frames with rot, and lead paint on pre-1978 trim all add work. Replacing only the glass is cheaper when the frame is still in good shape.

Neighborhoods served

• Ballard
• Capitol Hill
• Fremont
• Queen Anne
• Wallingford
• West Seattle
• Beacon Hill
• Green Lake

Other Washington cities

• Home repair in Bellevue
• Home repair in Spokane
• Home repair in Tacoma
• Home repair in Vancouver