Mold Inspection in Bothell, WA

Clues that point to an inspection

• Mildew returns on a bathroom ceiling within weeks of cleaning.
• A closet on an outside wall smells stale and stored items feel damp.
• A ceiling stain below an upstairs bathroom or a stain that grows after rain.
• Condensation pooling on window sills most mornings from November to March.
• A dishwasher, fridge line or water heater leaked and the floor was wet for days.

What drives moisture in Bothell homes

Bothell sits about 14 miles from Seattle in the Northshore area, with the Sammamish River running through on its way to Lake Washington. King County says that from Woodinville downstream to the lake, the river generally stays within its banks, so river flooding is not the main story here. Indoor moisture is. The median house or condo in Bothell was built around 1989 and the median apartment around 2002, which means a lot of tighter construction where humidity from showers, cooking and drying laundry has fewer ways out.

In those homes inspectors spend time on bath fan ducting in the attic, the rim joist and crawl space if there is one, and walls behind showers and kitchens. Older houses near downtown Bothell add vented crawl spaces and original windows to the list.

Cost factors

Angi's 2026 national data puts a typical mold inspection at $303 to $1,044. HomeGuide's 2026 national range is $300 to $650. The number of rooms or units, access to the attic and crawl space, and any lab samples decide where a Bothell job lands. Ask for the price in writing before the visit.

What happens after you call

You are connected with an independent local inspector or remediation company and can describe what you have seen. On site, the inspector should check the whole home, take moisture readings and photos, and explain the likely source before recommending anything. If the plan includes rebuilding walls, Bothell's Permit Center handles building permits online, and electrical permits come from Washington L&I. Renters should know that Bothell Code Compliance looks at unsafe structures and Building Code violations but does not enforce tenant-landlord disputes; the city points renters to the Attorney General's landlord-tenant resources and RCW 59.18.