Structural Repair in Mercer Island, WA
When rot reaches the framing, we support the structure and rebuild it properly. These members carry decks, walls and roofs, and they fail slowly and quietly. We shore the structure before anything comes out, replace damaged framing with properly sized lumber and code-rated connectors, and fix the water problem that caused the damage in the first place. We serve homeowners across Mercer Island and nearby Bellevue and Seattle.
Before
AfterBalcony framing rebuilt
Why structural repair comes up so often in Mercer Island
Hillside construction is the norm on Mercer Island, so many homes rely on posts, beams and stepped foundations to support decks, porches and cantilevered rooms. When water gets into those members, the framing weakens gradually. We find rotted rim joists behind deck ledgers, sill plates decaying at grade on the uphill side, and posts failing at their bases on steep South End lots. Our crew shores the structure, removes compromised framing, and installs new lumber with proper connectors. We level sagging areas where needed and correct the moisture source so the repair stays sound.
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 structural repair in Mercer Island
- Soft subfloor near exterior doors
- Doors or windows that start to stick
- Rusted or missing hangers and ties
- Posts that are cracked, soft or split at the base
- Sagging decks, floors or rooflines
Our structural repair process, step by step
Assess the load path
We find what the damaged member carries and how far the rot goes.
Shore it safely
Temporary supports go in before anything structural comes out.
Replace the framing
New posts, beams, joists or plates sized for the load.
Connect and protect
Code-rated hardware, flashing and raised post bases.
Close up
Sheathing, siding and trim rebuilt and finished to match.
Recent structural repair projects near Mercer Island
What we do in Mercer Island
Posts and beams
Replace rotted posts and beams with proper connectors and raised bases.
Hardware upgrades
Modern hangers, ties and post bases to current code.
Temporary shoring
Support the structure safely while members are replaced.
Deck and balcony framing
Rebuild framing that has started to sag.
Sill plates and walls
Replace rotted sill plates and wall framing at the foundation.
Joists and rim boards
Sister or replace damaged joists and rotted rim boards.
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.
How we fix damaged framing
| Method | Used when | What it involves | Typical time |
|---|---|---|---|
| Sister a joist or rafter | The original member is weakened but mostly sound | A new member is fastened alongside to share the load | Hours to a day |
| Replace a post or beam | The member is rotted through or cracked | Temporary shoring, new member, new connectors | 1–3 days |
| Replace sill plate | The plate on the foundation has rotted | Short sections shored and replaced one at a time | 2–5 days |
| Add a post and footing | A span is sagging or a footing failed | New footing and post on a raised base | 1–3 days |
What structural repair typically costs in Mercer Island
| Project | Typical scope | Price range | Timeline |
|---|---|---|---|
| Single post or beam | Shore, replace and add new connectors | $1,500 – $5,000 | 1–2 days |
| Sill plate section | Replace a rotted run of plate at the foundation | $3,000 – $10,000 | 2–5 days |
| Deck or porch framing | Rebuild joists, beams and posts under a deck or porch | $6,000 – $18,000 | 1–2 weeks |
| Larger framing rebuild | Wall or floor framing over a bigger area, often with a permit | $15,000 – $35,000+ | 2+ weeks |
These are typical 2026 ranges we see for structural 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.
Structural repair in Mercer Island: cost and timing
Most common causes
Wood in contact with concrete or soil
Posts and plates without a barrier or raised base wick moisture and rot from below.
Long-term leaks
Years of small leaks at decks, doors and walls slowly rot posts, beams and sill plates.
Undersized or failed connections
Old nails and missing hangers let members shift, crack and take on water.
What drives the price in Mercer Island
Structural repair in Mercer Island is priced by how much framing has to be replaced, how much shoring is needed, access, and whether a permit or engineer is required. A single post or short section of sill plate is a smaller job than rebuilding framing under a deck or wall. You get a written price after the free inspection.
Typical timeline
Most post, beam and sill repairs take a few days. Larger framing rebuilds take one to two weeks, plus permit time if one is required.
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
“As a Condominium owner finding contractors that can work with multiple concerns at once is a challenge. The team at Eco Home Repair has been our go-to for several projects including deck and front porch repairs, siding replacement, chimney chassis repairs…”
“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…”
“Alex responded quickly and came out the next day to provide a free quote for a potential siding issue that I was very concerned about. He inspected it, determined it wasn't a major issue, and recommended some simple, no cost, DIY steps I can do to take care…”
5.0 average from 106 reviews on Google, Thumbtack, Angi, HomeAdvisor and Yelp. Read our reviews on Google.
Questions Mercer Island homeowners ask about structural repair
Do you serve all parts of Mercer Island, including steep South End lots?
Do structural repairs in Mercer Island need a permit?
Do you work under decks and porches?
Is my house safe if a post or beam is rotted?
Can you work while we live in the house?
More from our crew in Mercer Island
Structural repair near Mercer Island
Tell us about your structural repair project in Mercer Island
- Licensed, bonded & insured
- Free on-site estimates
- 24-month workmanship warranty
Book a free structural 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.