Window, Door & Trim Repair in Mercer Island, WA
Exterior trim, window and door repair that looks right and sheds water. Paint cracks at a trim joint, water runs behind the casing, and the sill and framing underneath slowly go soft. We replace rotted sills, jambs and trim with rot-resistant material, add head flashing and sill pans, and keep your windows whenever they are still in good shape. We serve homeowners across Mercer Island and nearby Bellevue and Seattle.
Before
AfterNew siding and trim around the window
Why window and trim repair comes up so often in Mercer Island
Large windows and sliding doors facing the lake are standard on Mercer Island homes, and they take steady weather. Sills, jambs and surrounding trim absorb water when sealant fails or head flashing is missing, and rot can reach the framing before anyone notices. Older homes often have original wood trim that has decayed at joints. On the island we open the trim, probe the framing below each sill, and set a sloped pan sealed with tape before new casing goes on. Door thresholds are rebuilt and flashed so rain drains away from the opening.
Mercer Island’s homes range from 1940s and 50s cottages in East Seattle and the North End to mid-century ramblers in neighborhoods like Mercerwood, and many large newer houses built on the island’s slopes and shoreline. Older homes often have cedar or wood lap siding, while newer ones use fiber cement, stucco or mixed cladding. Lots tend to be sloped and wooded, with daylight basements and decks that step down toward Lake Washington views. Waterfront homes along East and West Mercer Way often have docks, boathouses and multi-level terraces.
Surrounded by Lake Washington, Mercer Island gets wind from almost every direction depending on the storm, and lake-facing walls take wind-driven rain. Steep, wooded slopes keep many homes shaded and damp, and dense trees around Pioneer Park and along the Mercer Ways drop needles that clog gutters. Long wet winters mean wood rarely dries out between fall and spring. Large windows and decks oriented toward the water are the most exposed parts of most homes.
Our crew comes out from our Woodinville office, and we also work in nearby Bellevue, Seattle, Medina and Kirkland.
When to call about window and trim repair in Mercer Island
- Gaps between trim and siding
- Door jambs or thresholds that feel spongy
- Paint failing at trim corners and joints
- Stains on the wall below a window
- Soft or cracked window sills
Our window and trim repair process, step by step
Inspect each opening
We probe sills, jambs and trim and photograph the damage.
Remove the rot
Damaged trim and wood come out back to solid material.
Flash and seal
Flashing tape, head flashing and sill pans where needed.
Install new trim
Trim, sills and jambs installed to match your home.
Finish
Caulked, primed or painted, and cleaned up.
Recent window and trim repair projects near Mercer Island
What we do in Mercer Island
Door jambs and thresholds
Rotted jambs and thresholds rebuilt, with a sill pan underneath.
Head flashing
Flashing above windows and doors that sends water outward.
Garage door trim
Rotted garage door jambs and trim replaced.
Paint-ready finish
Caulked and primed, or painted to match.
Exterior trim
Casings, corner boards and band boards replaced to match.
Window sills
Rotted sills cut out and replaced with rot-resistant material.
Neighborhoods and permits in Mercer Island
North End homes near I-90 and Luther Burbank Park include many older houses with original siding and small decks. East Seattle and the west side face Seattle across the lake, catching weather on west walls. Mercerwood and the central island have mid-century homes under heavy tree cover. The South End and properties along East Mercer Way sit on steep, wooded slopes where tall decks and daylight basements are common.
Patching small areas of trim, siding or decking with identical material rarely needs a permit. Steep-lot deck rebuilds, structural work and larger replacements usually call for one. The City of Mercer Island handles that review, and we confirm the requirements with them up front, submit what is needed, and keep inspections on the calendar.
Exterior trim materials
| Trim | Rot resistance | Upkeep | Where it works best |
|---|---|---|---|
| Primed finger-joint pine | Low | Keep painted and caulked | Higher on the wall, protected areas |
| Cedar | Medium | Paint or stain on schedule | Homes with a traditional wood look |
| Engineered trim | High | Repaint roughly every 10 years | Most exterior trim |
| PVC trim | Very high | Occasional washing, optional paint | Sills, near the ground, wet spots |
What window and trim repair typically costs in Mercer Island
| Project | Typical scope | Price range | Timeline |
|---|---|---|---|
| One sill or trim piece | Replace a rotted sill or casing and flash it | $500 – $1,500 | 1 day |
| Door jamb and threshold | Rebuild jamb, threshold and add a sill pan | $1,200 – $3,500 | 1–2 days |
| Several openings | Sills and trim on 3–6 windows or doors | $3,500 – $10,000 | 3–6 days |
| Whole-house trim | Trim, sills and flashing around most openings | $10,000 – $25,000+ | 1–3 weeks |
These are typical 2026 ranges we see for window and trim repair in Mercer Island and nearby cities. Your price depends on what we find once the area is open, access and height, and the materials you choose. Every estimate is free, in writing and based on an on-site inspection with photos.
Window & trim repair in Mercer Island: cost and timing
Most common causes
No head flashing
Without flashing above the window or door, water runs behind the casing.
Doors without sill pans
Thresholds leak into the jamb and subfloor when there is no pan underneath.
Cracked paint at trim joints
Water gets into the end grain of trim and sills through small cracks at the joints.
What drives the price in Mercer Island
Window, door and trim repair in Mercer Island is priced per opening and by how far the rot goes into the framing. Replacing a sill or casing is a small job; rot in the framing under a window takes more. You get a written price after the free inspection.
Typical timeline
Most window and door trim repairs take one to two days. Several openings or framing repairs take a few days longer.
Backed by a 24-month workmanship warranty
Written scope
You know exactly what is included before work starts, with photos of what we found.
Our own crew
The people who quote your job are the people who do it, start to finish.
Clean site daily
Debris is hauled away and your yard is left the way we found it.
24 months covered
If our workmanship fails within two years, we come back and make it right.
What homeowners near Mercer Island say
“Very responsive, Professional, and provided a competitive quote. Very happy we reached out to him!”
“Alex and his team did a great job fixing our siding and bottom door frame which had some rotting. They were professional, competitive in pricing and responsive. Highly recommend Eco Home Repair!”
“This concerns the work of a company hired to fix some troublesome spots on our home. They were able to rebuild and refinish a window frame that had deteriorated from weather damage over the years. They did an excellent job. That one fix made the house look…”
5.0 average from 106 reviews on Google, Thumbtack, Angi, HomeAdvisor and Yelp. Read our reviews on Google.
Questions Mercer Island homeowners ask about window and trim repair
Is access a problem for repairs on narrow Mercer Island driveways and steep lots?
Can you replace just a rotted window sill in Mercer Island?
Will you paint the new trim?
What trim material do you recommend?
What trim lasts longest here?
More from our crew in Mercer Island
Window & trim repair near Mercer Island
Tell us about your window and trim repair project in Mercer Island
- Licensed, bonded & insured
- Free on-site estimates
- 24-month workmanship warranty
Book a free window and trim repair inspection in Mercer Island
We inspect the damage on-site, show you photos of what we find and give you a written price before any work starts.