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Carpentry in Mercer Island, WA (98040) · Local Professionals

Seattle Carpentry · Fast response in Mercer Island and the Seattle area · Free estimate 24h

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Mercer Island's established estates and waterfront homes demand carpentry work that respects both the craftsmanship of the original builds and the relentless moisture that defines the Puget Sound climate. Seattle Carpentry has been serving Mercer Island and the surrounding Seattle area since 2016, handling everything from finish trim on century-old Craftsman details to structural repairs that keep these properties sound.

Homeowners on the Island call us because we understand what water does to wood here. The constant drizzle and year-round dampness that make Mercer Island beautiful also make wood rot the most common repair we see. We show up, explain what's happening, price the work honestly, and leave your home in better shape than we found it.

Carpentry in Mercer Island (98040)

Mercer Island sits in one of the wettest climates in the country, not because of heavy downpours but because of persistent moisture. Your siding, fascia, deck framing, sill plates, and rim joists stay damp for months at a time. That constant exposure to water is what drives wood rot and carpenter ant damage here, far more than any freeze-thaw cycle or seasonal storm. The Island's tree cover and proximity to the water only deepen the moisture problem. Add in the mix of older Craftsman homes, mid-century cottages, and newer construction, and you get a range of repair needs that demands both structural knowledge and finish carpentry skill.

Our team has spent eight years working on Mercer Island properties: sistering compromised floor joists, replacing rotted sill plates and rim joists, installing custom built-ins that match original millwork, and repairing the fascia, soffit, and exterior trim that take the first hit from the weather. We know the Island's terrain, lot sizes, and the importance of respecting both the character of older homes and the expectations of newer ones. We're fully insured, and we work with the permits and inspections that Mercer Island and King County require.

Our services in Mercer Island

How a Job Works in Mercer Island

We start with a free on-site assessment. You call us at (425) 671-4050 or reach out online, and one of our carpenters visits your property to look at the work, ask questions about what you've noticed, and explain what we see. We take photos, measure, and give you a straightforward estimate. No pressure, no sales pitch, just the facts about what needs to happen and what it costs.

Once you're ready, we schedule the work. If permits are required (structural changes, load-bearing wall alterations, deck work, or stair modifications commonly do require them), we'll guide you to contact the City of Mercer Island or King County Building and Planning to confirm what applies to your job. We handle the carpentry itself: removing rotted wood, installing new framing or sill plates, scripting and installing trim, hanging doors, building custom shelving, or whatever the scope calls for. On Mercer Island, tight lot access and mature landscaping sometimes mean we work carefully around trees and property lines, and we do that without complaint.

When we're done, we clean up our debris, walk through the finished work with you, and answer any questions about maintenance or what to watch for. Your property is left clean and the work is solid.

Pricing on Mercer Island depends on the scope and condition of the wood. A straightforward wood rot repair in siding or fascia typically starts around $650 to $1,200, depending on how much damage has spread. Floor joist or subfloor repair usually runs $1,800 and up, since accessing and replacing structural wood takes time and care. Finish work like crown molding, baseboard, or custom built-ins starts lower (around $450 to $550 for trim, $1,900 and up for built-ins) but varies widely based on materials, complexity, and the size of the space. Exterior and entry door installation ranges from $350 for interior doors to $850 and up for exterior doors, depending on the frame condition and whether the jamb needs repair. The biggest variables are how much rotted wood we find once we open things up, whether the substructure is sound or needs reinforcement, and how tight the access is on your lot. We'll give you a realistic number after we see the job in person. Call us at (425) 671-4050 for a free estimate.

✅ Fully Insured, fully insured for work in Mercer Island and nearby areas.

Why does my Mercer Island home have so much wood rot, and how do I know if it's serious?
The Puget Sound climate means wood stays damp year-round. Rot starts when water sits against siding, fascia, deck framing, or sill plates long enough for the wood fibers to break down. You'll see soft spots, discoloration, or wood that feels spongy when you press on it. Early rot can be cut out and repaired. Advanced rot means the wood has lost its strength and needs to be replaced. We assess the damage on-site and explain whether repair or replacement makes sense.
I found carpenter ants in my Mercer Island home. Can you treat them?
We don't do pest treatment or extermination, that's a separate licensed trade. What we do is repair and replace the wood damage that carpenter ants have caused. Start with a pest inspection report from a licensed pest control company to confirm what you're dealing with. Once you have that report, bring it to us and we'll repair the damaged framing, joists, trim, or sills so your home is structurally sound again. Call (425) 671-4050 to discuss the repair scope.
What's a typical cost to repair a rotted deck frame on Mercer Island?
Deck and porch repair starts around $900, but the real cost depends on how much of the frame is compromised. A small section of rotted rim joist or decking might be $1,200 to $2,000. A full structural repair involving multiple joists, ledger board work, or post replacement can run $3,000 to $5,000 or more. The Island's moisture means deck framing fails faster here than in drier climates. We assess the damage, show you what's sound and what needs replacement, and price accordingly.
Do I need a permit for carpentry work on my Mercer Island property?
It depends on the scope. Finish work like trim, molding, or interior doors usually doesn't require a permit. Structural work almost always does: removing or altering a load-bearing wall, replacing floor joists or beams, installing exterior doors, or building or repairing a deck all commonly require permits. Stair or railing work may also require one. Rules vary, so contact the City of Mercer Island or King County Building and Planning to confirm what applies to your job. We'll work with whatever permits are needed.
My HOA has rules about exterior work. Can you coordinate with them?
Yes. Many Mercer Island properties have HOA approval requirements for exterior changes, deck work, or visible alterations. Let us know about your HOA rules when you call, and we'll work with you on timing and documentation. We don't submit HOA applications ourselves, but we're happy to provide photos, plans, or specifications that support your approval request. Call (425) 671-4050 to discuss.
Are you insured to work on my Mercer Island home?
Yes, we're fully insured with general liability and workers' compensation coverage. That protects you and your property while we're working. If damage occurs, we can help document it for your own insurance claim, though we can't guarantee claim approval or coverage. Ask for proof of insurance when you get your estimate.
What should I do to prevent wood rot on my Mercer Island property?
Keep water away from wood. Make sure gutters and downspouts drain away from the house. Seal gaps in siding and trim where water can hide. Paint and stain exterior wood every 5 to 7 years, depending on exposure. Trim tree branches that hang over your roof and deck to improve air circulation and reduce moss and algae growth. Check your deck, sill plates, and fascia every couple of years for soft spots or discoloration. The earlier you catch rot, the cheaper the repair. If you spot something, call us at (425) 671-4050 for an assessment.
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Our services

Our Carpentry Services in Seattle

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Wood Rot & Dry Rot Repair

We cut back to sound wood, find the water that caused it, and rebuild to last.

Included in your service

  • Probing to map how far the decay actually runs
  • Decayed framing, siding and trim cut out, not filled over
  • Rebuilt in redwood, Douglas fir or primed rot-resistant stock
  • The moisture source traced and closed, or the rot returns
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Termite Damage Repair

The exterminator handles the insects. We rebuild the wood they left behind.

Included in your service

  • We work from your pest inspection report, section by section
  • Eaten studs, sill plates, rim joists and subfloor replaced
  • Structural integrity restored before finishes go back on
  • No treatment, no fumigation: pest control is a separate trade
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Floor Joist & Subfloor Repair

Soft, bouncy or sloping floors almost always start under the finish surface.

Included in your service

  • Joists, subfloor and bearing points inspected from below
  • Sistering where a joist is sound enough to keep
  • Full joist or subfloor replacement where it is not
  • Straight answer on what is old settling and what is real damage
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Beam Replacement & Load-Bearing Wall Removal

Real structural carpentry: engineered beams, headers, and openings done to spec.

Included in your service

  • Temporary shoring set before anything load-bearing comes out
  • Engineered beams and headers installed to the drawings
  • We say plainly when your job needs a structural engineer first
  • Built to the permit set, ready for city inspection
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Framing & Structural Carpentry

Straight, plumb and square: the bones every finish detail depends on.

Included in your service

  • New interior walls, openings, garage and basement build-outs
  • Stud framing, headers and blocking sized for the span
  • Fire and water damaged framing cut back and rebuilt
  • Laid out so drywall, trim and cabinets land where they should
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Finish & Trim Carpentry

Tight miters, scribed fits, consistent reveals. This is where a carpenter shows.

Included in your service

  • Casing, paneling and wainscoting fitted to the room as built
  • Scribing to walls that are neither flat nor plumb
  • Coped joints on inside corners instead of caulked gaps
  • Profiles matched to existing Victorian and Edwardian millwork
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Crown Molding & Baseboard Installation

Crown, base and casing cut for the ceiling you actually have, not a perfect one.

Included in your service

  • Coped inside corners, mitered and glued outside corners
  • Baseboard, chair rail and window trim run to a clean line
  • Period profiles matched or kept crisp and modern, your call
  • Filled, sanded and caulked ready for paint
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Custom Built-Ins & Shelving

Built for the alcove you have: bay windows, sloped ceilings, awkward corners.

Included in your service

  • Bookshelves, window seats, media walls and Murphy beds
  • Designed around compact floor plans, not around stock sizes
  • Scribed and shimmed so nothing reads as an add-on
  • Face frames, doors and drawers aligned before we leave
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Interior Door Installation & Repair

Doors that stick or swing open on their own are usually the frame, not the door.

Included in your service

  • Jamb, hinges and reveal checked before anything is replaced
  • Doors hung, planed and adjusted to a settled opening
  • Damaged jambs and door frames repaired rather than swapped
  • Pocket and barn door hardware installed and tuned
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Exterior & Entry Door Installation

Entry, back and French doors set weather-tight against fog and wind-driven rain.

Included in your service

  • Opening flashed and sill pan set before the unit goes in
  • Rotted frames and thresholds repaired or fully replaced
  • Shimmed plumb so the door seals along its whole edge
  • Weatherstripping, hardware and strike plates fitted properly
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Cabinet & Vanity Installation

Level cabinets in a house where almost nothing is level. That is the whole job.

Included in your service

  • Floors and walls checked and a true level line struck first
  • Boxes shimmed, scribed to out-of-square walls and fastened
  • Kitchen, bath vanity and laundry storage set as one run
  • Doors, drawers and hardware aligned and adjusted at the end
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Stair & Railing Repair

Squeaky treads and loose banisters, repaired without rebuilding the whole stair.

Included in your service

  • Stringers, treads and risers checked for wear and movement
  • Loose newel posts and balusters re-anchored, not just glued
  • Period railings restored where the original stock is sound
  • Handrails and attic ladders installed to code height and grip
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Deck & Porch Repair

Repair first. We only recommend replacing when the framing no longer justifies it.

Included in your service

  • Boards, posts, stairs and framing probed for hidden decay
  • Rotted members replaced, sound structure kept and reused
  • Ledger connection and flashing checked where the deck meets the house
  • An honest repair-versus-replace number before work starts
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Fascia, Soffit & Exterior Trim Repair

Soft fascia and peeling paint at the roofline are the first sign of rot moving in.

Included in your service

  • Fascia, soffit and exterior trim replaced back to sound wood
  • Primed rot-resistant material on all six faces before install
  • Gaps closed so moisture and pests stop getting into the roofline
  • Ready for paint, with the water path corrected first
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