Basement Mold Removal in Mukilteo, WA

Signs your basement has a mold problem

• An earthy, stale smell when you open the basement door.
• Dark or greenish spots near the floor on walls that face uphill.
• Paint bubbling or flaking off concrete, sometimes with a white crust.
• Carpet or laminate that feels damp, cupped or soft.
• Mildew on the backs of stored furniture, luggage or boxes.
• Window wells that hold water after a storm.

Why Mukilteo lower levels get wet

Mukilteo is a waterfront community about 20 miles north of Seattle, set on bluffs above Possession Sound with Port Gardner Bay to the north. The bluffs are cut by ravines and gulches along several creeks, including Hulk Creek, which drains to the Sound, and Japanese Gulch. Severe erosion has even closed Mukilteo Lane. On sloped lots in Harbour Pointe, Chennault Beach or Olympus Terrace, rain soaks into the hillside and keeps moving downhill, so the wall of a daylight basement that sits deepest in the slope often stays wet from fall to spring. Add cold concrete and closed-up winter air and condensation becomes the second big source. Snohomish County's Flood Information Center has flood maps if you live near the shoreline.

What it costs

Angi's Seattle cost guide lists basement mold remediation at $425 to $2,475, with most Seattle-area pros charging $10 to $25 per square foot. HomeGuide's 2026 national range runs $1,500 to $6,000 for a partial basement and $6,000 to $15,000 for a full one. A finished lower level costs more because drywall, insulation and flooring come out, and Angi lists drywall replacement at $825 to $2,400. Drainage work on a sloped lot is usually a separate bid. Structural repairs or new walls go through the City of Mukilteo Permit Center and its online permit portal.

What happens when you call

You are connected with an independent mold remediation company that serves Mukilteo. Describe what you have seen, how long it has been going on and whether water is coming in now. If the company takes the job, it schedules a visit to measure moisture, check outside drainage and look behind finishes where needed, then gives you a written scope. Washington has no state mold license, so check the company's contractor registration on L&I's Verify a Contractor tool. Renters should know the city's Code Compliance office does not enforce tenant-landlord disputes, and the Snohomish County Health Department does not investigate mold in private homes; written notice to the landlord comes first.