Trim, Siding, and Dry Rot Repair Costs in King County, WA

Keeping up a King County home’s exterior costs real money, and it pays to understand the numbers. This guide breaks down trim repair, siding replacement, and dry rot repair, and the weather drives all three. King County sees 156 rainy days a year, with rainfall around 39 inches in Seattle and Tacoma. Add the humidity off Puget Sound and Commencement Bay, and wood on the house rarely dries out. That constant dampness is why older homes in Ballard, Capitol Hill, and North End Tacoma see so much rot.

The estimates below use 2025 pricing, broken out by material, labor, and where you live. Whether your house is a century-old place in Queen Anne or new construction in Crossroads Bellevue, the goal is the same: know the cost, set a real budget, and protect the exterior before problems grow. One rule we hold to is easy to skip: fix the water source first. Paint over rot without stopping the leak, and you pay for the same wall twice.

Understanding Trim Repair Costs in King County

Trim is the wood that seals the joints on your house—the casing around windows and doors, the fascia along your roofline, and the soffit under the eaves. It looks decorative, but its real job is keeping water out. In our steady rain, trim is usually the first thing to fail, and older homes in Capitol Hill, Magnolia, and Proctor show it first.

Minor repairs cost $120 to $400, which covers patching a small rotted section with epoxy and touching up the paint. Catch a failing window or door casing early, before the rot reaches the wall, and this repair is usually all you pay.

Window or door trim replacement runs $300 to $800 for materials and labor, and the board you choose drives part of that. Solid wood runs $0.50 to $6 per linear foot, while vinyl runs $1 to $3 per linear foot, and most jobs in Crossroads or Federal Way land in this range.

Fascia or soffit repair costs $500 to $1,200 on a standard job, though damage left to spread can climb to $2,875. We see plenty of it in Issaquah and Renton, where the roofline stays wet.

Labor rates run $65 to $105 an hour across King County, with Downtown Seattle and Bellevue at the top, where everything costs more. How far the rot has spread decides the rest: a few cracks in a Magnolia home cost little, while a full run of rotted fascia in North End Tacoma costs considerably more.

What you choose matters twice—once when you pay, and again every year you own the house. Vinyl is the inexpensive way in, but it warps and fades faster in our wet than a harder board, so the lowest bid can cost more over time. Wood and composite last longer but cost more up front, and anything up high adds money: on the steep hillside homes in Queen Anne, second-story work runs 25 to 65 percent more for ladders and staging.

Siding Replacement Costs in King County

Siding is your home’s raincoat, and even a good one eventually warps, cracks, and rots, faster on walls facing water in West Seattle or Ruston. The upside is resale value: a siding replacement returns up to 80 percent of its cost when you sell, so it is rarely money thrown away.

Vinyl siding replacement costs $12 to $25 per square foot installed, or $18,000 to $28,000 for a typical 1,500-square-foot home in Seattle. Tacoma runs a bit lower, around $12,000 to $22,000, on cheaper labor, and vinyl sheds water well with minimal maintenance and a 20 to 40 year life.

Cedar siding replacement runs $11 to $24 per square foot installed, or $60,000 to $90,000 for a 2,800-square-foot home in Bellevue. Cedar wins on looks, and plenty of Issaquah owners love it for that—but know the trade. You seal and stain it every 3 to 5 years, or it turns gray and drinks water. The wood alone runs $6 to $10 per square foot, or $3 to $10 for the Western Red Cedar we see most here.

Fiber cement siding replacement costs $9 to $18 per square foot installed, or $20,000 to $40,000 for a 2,500-square-foot home in Federal Way. This is the material we reach for most on Seattle walls. James Hardie® board shrugs off our wet winters, holds paint for years, and lasts 30 to 50 years, the safest bet in this climate for the money.

Labor runs $2,000 to $5,000 on a 1,500-square-foot home, climbing to $3,000 to $6,000 in Downtown Seattle, where rates and access cost more. Then come the add-ons: tearing off old siding runs $2,050 to $3,750 on a 2,500-square-foot home in Renton, house wrap adds $0.50 to $1.30 per square foot in South Tacoma, and permits run $500 to $1,500 in Seattle, less in a smaller city like Auburn.

Square footage drives the base price, so a 2,300-square-foot home in North End Tacoma costs more than a 1,500-square-foot home in Central Tacoma. Material sets the spread: vinyl is the budget pick for Federal Way, while brick siding at $10 to $22 per square foot suits high-end homes in Bellevue. Find rot behind the wall in West Seattle and structural repairs add $2,500 or more. Second-story work in Queen Anne adds another 25 to 65 percent for staging and safety.

Dry Rot Repair Costs in King County

Dry rot is a wood-eating fungus that feeds on damp lumber, and given steady moisture it spreads on its own, chewing through framing, siding, and trim. Homes near the water—Lake Washington in Kirkland, Commencement Bay in Tacoma—get the worst of it. The name is a bad joke: the fungus needs water to take hold, and only leaves the wood dry once it has hollowed it out.

Minor dry rot repairs cost $140 to $800, the range for a soft window sill in Fremont or a decayed door frame in Proctor. We cut out the compromised wood, treat the sound wood around it, and patch the void with epoxy or filler.

Moderate repairs run $1,500 to $2,800 for a patch of rotted siding in Crossroads or trim in Federal Way. Here we remove and replace the failed sections, install a fresh moisture barrier behind them, and refinish so the repair blends in.

Extensive repairs cost $4,500 to $12,000 for structural work, such as a rotted roof section in Issaquah or floor joists in Renton. These need permits and sometimes an engineer, and once we open a wall we routinely find more rot than anyone could see from outside—on an older home, that is the norm, not the exception.

Labor rates run $50 to $100 an hour, rising to $75 to $120 in Downtown Seattle. Demolition to expose the rot adds $4 to $17 per square foot in North End Tacoma, mold cleanup adds $1,150 to $3,400 if it turns up in South Tacoma, and a pre-1980 home in Capitol Hill may need asbestos testing at $482 before work starts.

How much wood is gone sets the price, so a small patch in Ruston is cheap next to widespread roof rot in the Stadium District. Where the damage sits matters too—a rotted beam in Bellevue costs far more than a trim board in Auburn. Exploratory work adds $500 to $1,500 as we pull siding or drywall to see the picture. Fixing the source—a leak, dead air, poor drainage—runs $200 to $500 in West Seattle. Skip that step and you will be back.

Local Climate and Housing Factors

The weather and the housing stock shift from one city to the next, and the repairs shift right along with them:

Seattle receives 39 inches of rain over 156 rainy days. Older homes in Capitol Hill and Ballard need the most work, worn by age and the humidity off Puget Sound. Anything built before 1990 may have no real moisture barrier behind the siding, increasing the risk of hidden rot.

Tacoma receives 39 inches of rain over 156 rainy days. Homes near Commencement Bay in North End stay damp, so rot appears more readily, and the Stadium District and Proctor are full of pre-1950 homes that need regular trim and siding maintenance.

Bellevue runs slightly drier, though it stays humid near Lake Sammamish. Newer Crossroads homes need less structural work, but damp still shows in the finish, and higher-end properties command premium rates.

Federal Way sits in heavy dampness near Puget Sound, and plenty of homes here need new siding once rot sets in. Most owners take the chance to upgrade to James Hardie® fiber cement for the way it holds up.

Issaquah is genuinely wet, sitting close to the Snoqualmie River. Roofs rot here whenever air cannot circulate and the wood stays damp, and the hills and tree cover trap even more moisture.

Kirkland and Redmond near Lake Washington see steady but moderate moisture. Tech-industry growth has pushed up labor and material demand, so pricing here tends to run higher.

Renton and Auburn come in cheaper on labor, roughly $50 to $80 an hour against Seattle proper, so on a large exterior project the bid often looks better out here.

Why Costs Vary Across King County

A handful of regional factors move the price from one town to the next:

Labor rates swing the most: Seattle and Bellevue run $75 to $120 an hour, while Auburn and Renton run $50 to $80. The gap tracks the cost of living, how busy the trades are, and how many capable crews are available.

Home age changes the scope. A pre-1980 house in Capitol Hill or Proctor may need asbestos testing at $482 or lead paint removal at $1,000 to $3,000 on top of the repair. Older homes also hide more rot behind the siding—damage you rarely find until you pull a board.

Permits and fees depend on the city. King County permits run $500 to $5,500 by scope. A Seattle siding job may need a $1,500 permit while Tacoma sits closer to $1,000, so confirm your local rules before the first nail.

Material supply nudges the price too. In busy markets like Bellevue and Kirkland, stock runs short in peak season and costs climb, and cedar costs more wherever demand for that natural wood look remains high.

Access and site conditions eat time and equipment. Hillside homes in Queen Anne, Magnolia, or North Seattle can need special staging at $4,000 to $10,000, which pushes the job up 25 to 65 percent.

Making Cost-Effective Decisions

A few practical ways to keep the cost in check:

Book in the off-season. Fall and winter are slower for crews in Seattle and Bellevue, so bids can soften. But rot never waits, so if the wood is soft or water is coming in, fix it now, not in spring.

Get more than one quote. Compare a few bids across Seattle, Tacoma, and Bellevue to learn the going rate. And always confirm the contractor is registered with Washington L&I and carries a bond and insurance. That one step saves homeowners the most grief.

Spend on prevention. Cleaning gutters, re-caulking trim, and chasing small cracks is the cheapest insurance you will buy on a house here. A $300 repair today routinely heads off a $2,800 project next year.

Buy the better material. Fiber cement and composite cost more up front than plain wood or vinyl, but their 30 to 50 year lifespan and near-zero maintenance make them the cheaper choice in a climate this wet.

Ask for a full tear-off. On a replacement, pulling all the old siding lets us inspect the sheathing—the flat panels underneath—and catch hidden rot. That rot is common here, and a full tear-off is the only honest way to find it. Fixing it now beats reopening the wall a year later.

For an accurate number on your own project—trim repair in Capitol Hill, new siding in Bellevue, or dry rot work in Tacoma—call (425) 517-1751 for a free estimate and a 15-point dry rot inspection from a crew that has worked King County homes for years.