First-time home buyer guide: Mercer Island, WA
An affluent island community in the middle of Lake Washington, Mercer Island offers a uniquely central yet tranquil setting, top schools, and quick access to both Seattle and Bellevue.
How much does a first home cost in Mercer Island, Washington?
A typical home in Mercer Island lists around $2,100,000 (benchmark estimate). Condos and townhomes trade meaningfully below that, which makes them the most common first-time entry point in Mercer Island. FirstNest's live King County market report tracks current medians and price per square foot across the county.
What are the WSHFC income limits in King County for 2026?
The Washington State Housing Finance Commission's Home Advantage down-payment-assistance program uses an income limit of $164,400 per year in King County. Buyers earning at or under that cap can pair a Home Advantage first mortgage with assistance up to 5% of the loan amount. Verify current limits at wshfc.org.
How much is property tax in Mercer Island, WA?
Mercer Island homeowners pay an effective property-tax rate of roughly 0.75% of assessed value per year. On a $2,100,000 home that equals about $15,750 annually, or $1,313 per month, billed by King County in two halves due April 30 and October 31.
What down payment assistance can first-time buyers in Mercer Island get?
First-time buyers in Mercer Island can use WSHFC's Home Advantage program, which lends up to 5% of the first-mortgage amount for the down payment as a deferred second loan. Lower-income buyers may qualify for House Key Opportunity, and ARCH serves East King County cities with additional below-market programs. A WSHFC-trained lender is required.
Do I need 20% down to buy a home in Mercer Island?
No — buyers in Mercer Island regularly close with far less than 20% down. Conventional loans allow 3-5% down, FHA allows 3.5%, and VA loans allow 0% for eligible veterans. Putting less than 20% down adds mortgage insurance, which drops off a conventional loan as equity grows.
Your Mercer Island first-home checklist
- Check your household income against the $164,400 WSHFC King County cap to see if down-payment assistance applies.
- Get a verified pre-approval from 2-3 lenders (start with the official WSHFC participating-lender directory).
- Budget the full monthly cost: mortgage + about 0.75% a year in Mercer Island property tax + insurance + any HOA dues.
- Research Mercer Island School District boundaries if schools matter to your search.
- Read every Form 17 seller disclosure and order a sewer scope on homes older than ~1990.
- Review the King County offer playbook: review dates, pre-inspections, escalation caps, earnest money at 1-3%.
- Plan a 30-45 day escrow; closing happens when the deed records with King County.
What the Mercer Island market is like
One of the metro's most exclusive markets. Predominantly high-end single-family; entry points are rare and prized.
Washington legal basics to know
- RCW 64.06 — Seller Disclosure (Form 17) ↗
Washington statute requiring residential sellers to deliver a Form 17 disclosure; buyers may rescind within three business days of receipt.
- Real Estate Excise Tax (REET) ↗
Washington's graduated tax on real-estate sales, customarily paid by the seller.
- RCW 64.04.005 — Earnest money liquidated damages ↗
Caps a buyer's forfeitable earnest money at 5% of the purchase price when liquidated damages are elected.
More King County city guides
Benchmarks are estimates for orientation, not appraisals; tax rates are approximate effective rates and vary by levy area. Verify WSHFC limits at wshfc.org and tax specifics with the King County Assessor. Education only — not financial, legal, or tax advice.