Mercer Island Homes for Sale

Mercer Island sits in Lake Washington, and the lake edge shapes almost everything about how the parcels here are laid out, from the shoreline lots down at the water to the sloped ground that looks across it. What you are shopping for, in plain terms, is a house on its own lot: most of the homes for sale on the island are detached, with the roof, the driveway and the yard all yours to run. Attached units in condo or townhouse developments exist, but they are the smaller part of the picture. Homes Northwest works this market closely, and the practical questions here tend to be about frontage, the age of the house, and how much exterior you want to be responsible for.

Mercer Island at a Glance

ZIP codes in these listings

98040

Typical asking price

$2,600,000 (median of 89 homes, excluding 11 land and other non-dwelling listings)

Typical sold price

$2,350,000, middle half $1,750,000-$3,175,000 (median of 237 home sales, excluding 2 land and other non-dwelling sales, past 12 months)

Typical home

3,295 sq ft (n=88) · 4 bed / 4 bath (medians, n=88)

Typical days to sell

12 days (median of 237 closed home sales, past 12 months)

Months of supply

4.5 (balanced, homes only)

Sold-to-list

98.2% of asking (median per home sale, n=237) · 20.3% sold above asking

Data current as of

August 2026

Waterfront homes in Mercer Island

Owning frontage means the water in front of you is open ground that stays open, though the far shore and the docks on either side belong to other people. That changes the daily use of the house more than any floor plan does: the back of the property becomes the working side, the side you launch from, tie up at, and keep an eye on through the winter. Recent sales here run to a median of $7,900,000 across 20 closed sales, with about 54 days between listing and close. At that level you are buying the shoreline structure along with the house, and the maintenance calendar starts at the water and works its way back up the lawn to the roof.

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Water view homes in Mercer Island

A view lot puts the lake in front of you as open ground that stays open, while the far shore and the docks along it stay in other hands. The house is built to face it, so the main living rooms, the glass and often the deck are all oriented one way, and the back of the house takes what is left. Median sale here is $3,000,000 across 93 sales, roughly 28 days to close, with the typical house built in 1986. Practically, that means a lot with grade to it, a driveway that works with the slope, and a lot of window area to wash, seal and eventually replace on your own schedule.

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Condos in Mercer Island

You can lock the door and leave for a season, and the roof, the grounds and the exterior go on being handled without you. That is the whole trade on the attached side of Mercer Island: you own the interior, from the paint in, and everything outside it is shared and paid for through a fee. Median sale is $607,500 across 30 sales, with about 20 days from list to close. Ask what the fee actually covers on any unit you are serious about, and what the association has set aside. Day to day, it means no ladder, no gutters, no lawn equipment in a garage, and a set of rooms whose upkeep begins and ends at your own front door.

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What ownership here asks of you

The typical house on the island was built in 1973, with the middle half of the stock falling between 1963 and 1997. Assume the major systems have already been through at least one replacement, and treat the question as when the next one comes due rather than whether it will. Four bedrooms is the most common layout sold, at a median of $2,450,000, and the largest single band of closings lands between $2M and $4M. Governance varies house by house: some sit inside an association with rules and reserve documents, and some sit in no subdivision at all with nothing but the county governing them. Establish which applies before you write on a listing. Either way, the roof over a fifty-year-old house is yours to schedule, and that schedule starts the day you take the keys.

What buyers filter for in Mercer Island

Views dominate the listing fields here: more than half of listings report a lake view, more than half report territorial, about half report mountains, roughly a third report city, and about one in ten report a partial view. Filtering on any of those narrows the pool quickly, so it is worth deciding which one you actually want to live with. On schools, the listings report Lakeridge Elem and Northwood Elem at roughly one in six each, with roughly a third simply marked for the buyer to verify; Islander Mid appears on nearly all listings at the middle level, and Mercer Isl High on nearly all at the high school level, each with a small share left unverified. These are fields typed in by the listing agent, not district assignments, and boundaries and stale fields both exist, so confirm the current assignment for a specific address with the school district directly.

Where Mercer Island listings actually come from

A handful of area names carry enough listings to be worth typing into a search box: the North End at roughly one in six, West Mercer at about one in ten, Westside at about one in ten, and the South End and Downtown at a small share each. Together those names cover only about half of what is on the market. The rest sits in smaller pockets with no name a buyer would think to look for, which means a name-based search quietly skips most of the island. The filters that actually work here are frontage, property class and price band. Set those first, then let the area names tell you where a particular house happens to sit.

Worth confirming before you write an offer

• Lakefront bulkhead or bank condition.
• Dock or moorage permit and condition.
• Commute-dependent access via floating bridge.
• Flood or erosion exposure near lake edge.
• Waterfront dock, moorage depth, and shoreline stabilization condition.

Working with Homes Northwest on Mercer Island

Homes Northwest works this island every week, and that shows up in small, practical ways: walking a house with you and pointing out what you would be taking on as an owner, so a listing stops being photographs and becomes a set of terms you can weigh. Waterfront is one of the purchases a buyer here weighs, and it deserves to be looked at carefully rather than assumed either way. The rest is a matter of sorting what you actually want to hold and maintain against what you would rather hand to someone else. Take the time to get that straight, and the home you settle on will be one you feel settled about.