Black Mold Removal in Bainbridge Island, WA

An island of damp corners

Bainbridge is a hilly island about 9 miles from Seattle, with roughly 53 miles of irregular coastline along Puget Sound, Port Orchard Bay, Rich Passage and Agate Pass. About 34.5% of its housing was built before 1980, and older homes tend to have less insulation, single-pane or early double-pane windows, and bath fans that were an afterthought. In a long, gray winter that adds up to cold walls, wet window frames and dark mold in closets and bedrooms. The city also notes that king tides can cause local tidal flooding starting in some areas around +13 feet above mean lower low water, with higher levels during windy storms.

What to do now

1. Look for the source. Window condensation, a roof or skylight leak, a plumbing drip, or water at the base of a wall.
2. Stop or reduce it. Fix the drip, run exhaust fans, add heat to cold rooms and use a dehumidifier.
3. Judge the size. EPA and the Washington Department of Health say under about 10 square feet is usually a homeowner cleanup.
4. Clean hard surfaces only. Use detergent and water, then dry. Moldy drywall, carpet and insulation usually have to be removed.
5. After tidal or storm flooding, dry within 24 to 48 hours if you can; EPA says to assume mold if you can't.
6. Call a professional for larger, hidden or recurring growth.

What you see, and why

Cost factors

Angi's Seattle cost guide lists typical mold remediation at $1,008 to $2,967; HomeGuide's 2026 national range is $1,500 to $6,000. Price follows the size of the area, how much material comes out, containment, access and repairs. Washington has no state mold license, so check that the company is registered with Washington L&I as a construction contractor. Rebuild permits go through the City of Bainbridge Island Building Division's online portal, and the city's Code Compliance takes written complaints through SeeClickFix.