King County · Washington
General Contractor in Mercer Island, WA
Mercer Island has the strictest tree regulations and some of the most demanding slope conditions of anywhere we work — and it is an island, which makes construction logistics a real line item.
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Professional Home Remodeling Services in Mercer Island
Mercer Island is a four-mile-long island in Lake Washington with a single city on it, and almost everything about building here follows from those two facts. The housing is substantial, largely mid-century, frequently on slopes, and surrounded by mature trees that the city protects vigorously.
The mid-century body of the island
Most Mercer Island houses were built between the 1950s and the 1970s, after the first floating bridge made commuting practical. They are typically larger than the regional average for the period — substantial ramblers, split-levels and daylight-basement houses on generous, wooded lots. Structurally they are cooperative, and the recurring brief is significant: these are houses where owners invest properly, so we are often doing whole-floor reconfigurations, primary suite additions, kitchen and bath work to a high finish standard, and lower-level conversions. Era conditions still apply — aluminum branch wiring in a narrow band of mid-1960s houses, single-pane glazing, insulation below current standards, original cast-iron drain lines and asbestos-era materials that we test before demolition.
The lakeshore and the slopes
The island’s perimeter falls to the water, in places steeply, and lakefront and near-lakefront parcels are among the most valuable in the state. Work there involves slope stability, engineered foundations and drainage, geotechnical reports as a matter of course, and shoreline provisions close to the water. View protection is taken seriously by neighbors as well as by the city.
The tree code, which genuinely shapes projects
Mercer Island regulates trees more strictly than any of its neighbors, and the island is heavily treed with mature conifers and deciduous canopy. Tree retention affects excavation, foundation footprint, where an addition or detached structure can sit, and sometimes whether a project is viable in the form the owner first imagined. Removal generally requires justification and often replacement planting. We assess trees before any design work, every time, because on this island it is the single most common reason a plan changes.
Island logistics
Everything arrives across a bridge, and much of the island’s road network is narrow and winding with limited on-street parking. Material deliveries have to be sequenced, dumpster placement planned, and crew parking arranged. It is not dramatic, but it is a genuine cost and schedule factor that off-island contractors routinely underestimate.
What We Build in Mercer Island
Six core services cover most of what Mercer Island homeowners ask us for. Every one is handled in-house, on one permit, by one project manager.
Kitchen Remodeling
Custom cabinetry, counters, lighting and full layout changes, permitted and built to code.
Bathroom Remodeling
Wet-room waterproofing, tile, vanities and fixture upgrades on older plumbing.
Home Renovation
Whole-house remodels that update systems, layout and finishes in one coordinated build.
Custom Homes
Ground-up design-build on infill lots and view parcels, from feasibility to final permit.
Room Additions & ADU
Bump-outs, second stories, attached ADUs and detached DADUs for added living space.
Patio Building & Remodeling
Covered patios, decks and outdoor living that stand up to Puget Sound winters.
Ready to Start Your Mercer Island Home Project?
Whether it’s a single bathroom or a whole-house remodel, the first step is the same — a walkthrough, an honest scope and a number you can plan around. We’ll tell you what your Mercer Island home actually needs, not what’s easiest to sell.
Remodeling in Mercer Island: What the Area Demands
Mercer Island sits in the middle of Lake Washington, connected to Seattle and Bellevue by the I-90 floating bridges, and it is both a city and an island of about thirteen square miles.
Geography and how it affects a build
The island rises from the water to a wooded central plateau, so almost every parcel has some grade and the perimeter has a great deal of it. Landslide and steep-slope hazard areas are mapped around much of the shoreline, and geotechnical involvement is normal rather than exceptional on those parcels. The soils are glacial and drain unevenly, and because water has nowhere to go but the lake, drainage design and impervious-surface limits are enforced attentively. Mature tree canopy covers much of the island and is regulated.
Neighborhood character
Mercer Island is affluent, established and quiet, with excellent schools and a small town center near the north end. The north end is closer-in and denser with some multi-family; the south end is more spread out with larger, more wooded parcels. East and west shorelines hold the highest-value properties. There is a strong sense of community identity and, correspondingly, real neighbor interest in what happens to street-facing elevations and view corridors. Owners here typically plan to stay, so the work tends toward long-horizon quality rather than resale-driven updates.
Construction considerations specific to Mercer Island
Tree retention above all. Slope and geotechnical requirements around the perimeter. Shoreline provisions on waterfront parcels. Drainage and impervious-surface limits citywide. Island access and narrow roads affecting staging, deliveries and parking. And a review process that is thorough, because the city’s regulations reflect what residents have asked for.
Nearby areas we also serve
About Mercer Island, WA
Mercer Island is named for the Mercer brothers, early Seattle settlers, though none of them actually lived on it. For its first decades of European settlement it was farmland and orchard reached only by boat, with a summer resort at the north end and a scattering of cabins around the shore. A ferry ran to Seattle, and the island stayed genuinely remote from the city a mile and a half away.
The Lacey V. Murrow floating bridge changed that permanently in 1940. Suddenly the island was a short drive from downtown Seattle, and it developed rapidly through the 1950s and 60s into an affluent residential suburb — which is why so much of the housing dates from that period. The town of Mercer Island and the surrounding island area merged into a single city in 1970, giving the island one government for its whole area.
Today around 25,000 people live on the island. It has among the highest household incomes and best-regarded schools in the state, a deliberately protective approach to trees and neighborhood character, and a housing stock that is substantially mid-century and steadily being renovated to a high standard. For homeowners the practical reality is that values comfortably support serious investment, and the constraint is regulatory and logistical rather than financial — which is why the feasibility work here matters more than almost anywhere else we build.
Remodeling in Mercer Island — Common Questions
How strict is the Mercer Island tree code, really?
Stricter than any neighboring city, and it genuinely shapes projects. The island is heavily treed and tree retention affects excavation, foundation footprint and where an addition or detached structure can sit. Removal typically requires justification and often replacement planting.
We assess trees before any design work. On this island it is the most common reason a plan changes, and finding out at permit stage is expensive.
Do I need a geotechnical report?
On a perimeter or sloping parcel, very likely. Landslide and steep-slope hazard areas are mapped around much of the shoreline, and work affecting foundations, drainage, retaining or footprint in those areas needs engineered detail supported by geotechnical input.
We identify it at the first walkthrough and build the report and review time into the schedule rather than discovering it later.
Does being on an island really change the cost?
It changes logistics, which changes cost. Everything crosses a bridge, many roads are narrow and winding, and on-street parking is limited — so deliveries have to be sequenced, dumpster placement planned and crew parking arranged.
It is not dramatic, but it is real, and off-island contractors routinely underestimate it. We price it explicitly.
My Mercer Island house is 1960s post-and-beam. Can it be opened up?
Usually yes, and often more easily than an equivalent stick-framed house, which is one of the pleasures of working on the island. Post-and-beam and daylight-rambler construction from that era concentrates load in a few identifiable places, so removing an interior wall is frequently a partition removal rather than a structural event. Where a beam does carry, the replacement detail is clean.
The parts that need respect are the envelope and the glass. Original single-pane window walls and sliding units are usually beyond saving, and replacing them without losing the proportion that makes the house good is a design problem, not a shopping problem. Flat and low-slope roof sections from that period also tend to be at end of life, so we look at roof, glazing and insulation as one package.
Can I add a second story or a substantial addition?
Often yes, but the constraints stack: height limits, lot coverage, impervious surface, tree retention, slope provisions and, on the perimeter, view considerations from neighboring properties.
A feasibility review before design establishes what is actually achievable, which on this island is money very well spent.
My lower level is damp. What is the actual fix?
Site water, almost always. On island slopes water is directed toward the house by grade, and perimeter drainage is either undersized or has failed. New finishes over that fail again.
Grade, drainage and waterproofing get corrected as their own scope, signed off, and only then do we finish. On the island’s slopes that usually means intercepting water uphill of the house rather than trying to seal the wall from the inside.
Proudly Serving Mercer Island, WA and Surrounding Areas
We work across Mercer Island — the north end, town center, East Seattle, First Hill, Mercerwood, the south end and the east and west shorelines — and throughout the neighboring communities of Bellevue, Seattle, Newcastle, Renton, Medina and Clyde Hill.
Licensed, bonded and insured in Washington, with one project manager from walkthrough to final inspection.
| Zip Code | Area Code | City | County | State |
|---|---|---|---|---|
| 98040 | 206 | Mercer Island | King County | Washington |