Crawl Space Mold Removal in Bainbridge Island, WA

An island of older homes and wet air

Bainbridge Island has about 53 miles of irregular coastline along Puget Sound, Port Orchard Bay, Rich Passage and Agate Pass, with Eagle Harbor cutting in at Winslow. Roughly a third of island houses, 3,733 of 10,805 in Census-derived counts, were built in 1979 or earlier, and many of those sit over crawl spaces whose original plastic and insulation are long past their best. The city also warns that king tides can bring local tidal flooding starting around +13 feet above mean lower low water, higher during windy storms, so low waterfront lots can get salt water close to or under a foundation.

What to do now

1. Check after a storm. Open the hatch after a heavy rain or king tide and look for standing water or wet soil.
2. Clear the drains. Make sure gutters, downspouts and any footing drains are moving water away from the house.
3. Pull the plug on new moisture by fixing drips from plumbing above the crawl space.
4. Protect yourself with gloves, eye protection and an N-95 if you go under the house.
5. Don't spray and seal. EPA warns that painting or coating over mold does not fix it.
6. Write it down. Photos and notes help when comparing bids or calling your insurer.

Signs and likely causes

Cost factors

Angi's Seattle cost guide lists crawl space jobs at $425 to $1,650, and HomeGuide's 2026 national range is $1,500 to $4,000. Older island homes with low clearance, heavy insulation or rotted sills usually land at the higher end. Structural repairs are reviewed by the City of Bainbridge Island Building Division through its online permit portal. Washington has no state mold license, so confirm L&I contractor registration first.