Mold remediation technician in protective gear inspecting mold on a basement wall

Mold Remediation & Removal

Mold Remediation & Mold Removal in Seattle

We find, contain and remove mold from homes and businesses across Seattle, King County and Pierce County, then fix the moisture that caused it.

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24/7 Emergency Response
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IICRC Certified Technicians
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Residential & Commercial
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Insurance Assistance

Local mold remediation experts

Professional Mold Remediation Services

Western Washington’s long wet season keeps building materials damp for months, so mold is common in crawl spaces, attics, bathrooms and basements. Removing the mold you can see isn’t enough: it grows back wherever the moisture remains.

Our IICRC-certified technicians inspect the property, contain the area, filter the air, remove and clean affected materials, and correct the moisture source, so the mold doesn’t come back. Free estimates, 24/7.

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Our Mold Remediation Services

A complete remediation, not just a surface cleanup.

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Mold Inspection & Testing

We trace musty smells and hidden moisture to find all of the mold before any removal starts.

Technician cleaning mold from attic rafters

Attic Mold Removal

We remove mold from roof sheathing and insulation and fix the leak, fan or ventilation issue behind it.

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Basement Mold Removal

We remove mold from damp or flooded basements and dry the walls, floors and framing so it doesn't return.

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Black Mold Removal

Dark mold on drywall, sills or grout? We remove it safely and fix the moisture that let it grow.

Understanding Mold: Causes, Risks and Next Steps

Mold remediation vs. mold removal: what’s the difference?

Mold removal means cleaning or cutting out the mold you can see. Mold remediation is the complete job: finding all of the growth (including hidden mold), sealing off the area so spores don’t spread, removing and cleaning affected materials, filtering the air, and correcting the moisture source. Removal alone often fails because mold grows back wherever the moisture remains. That’s why every mold job we do is a remediation job, whether you call it removal, cleanup or abatement.

Why mold is so common in Seattle homes

Western Washington’s long, wet season keeps building materials damp for months. Add cool indoor surfaces in winter and many older homes with vented crawl spaces, and mold has what it needs. The places we find it most often:

  • Crawl spaces: wet soil, missing or torn vapor barriers, and damp insulation under the floor.
  • Attics: roof leaks, poor ventilation, and bathroom or kitchen fans that vent into the attic instead of outside.
  • Bathrooms and laundry rooms: daily humidity with weak exhaust.
  • Basements: seepage after heavy rain, and leftover moisture from past leaks or floods.
  • Around windows: winter condensation that soaks sills and frames.
  • Behind walls and under floors: slow plumbing leaks that nobody sees until the smell or stains appear.

Signs you may need mold remediation

  • A musty, earthy smell that won’t go away
  • Black, green or white spots on walls, ceilings, wood or insulation
  • Peeling paint, warped flooring or stained drywall after a leak
  • Condensation that keeps forming on windows and walls
  • Allergy-like symptoms that ease when you leave the building
  • Any water leak or flooding that wasn’t dried within 24–48 hours

When to call a professional

Small spots on a hard surface, like a few square inches of mildew on bathroom grout, can usually be cleaned by the homeowner. Call a professional when:

  • The affected area is larger than about 10 square feet. Environmental health guidance recommends a remediation contractor above that size.
  • The mold is inside walls, under floors, in HVAC ducts or in the crawl space.
  • The growth followed a sewage backup or floodwater.
  • Someone in the home has asthma, allergies or a weakened immune system.
  • You need documentation for an insurance claim, a sale, or a landlord-tenant situation.

Homes and businesses

We handle mold in houses, condos, apartments and rentals, and in commercial properties: offices, retail stores, restaurants, schools and warehouses. For businesses, we plan containment and work hours around your operations to keep downtime low. Most projects take 1–5 days, depending on the size of the affected area.

Does insurance cover mold remediation?

It depends on the cause. Mold that results from a sudden, covered event, such as a burst pipe, is often covered as part of that water damage claim. Mold from long-term leaks, humidity or poor maintenance often is not. We document the damage with photos and moisture readings and work directly with most major insurance companies.

Mold usually starts with water: for an active leak or flooding, see our water damage restoration service first. Mold under the house is covered by our crawl space cleaning service, and lingering odors by our sanitization services. We provide mold remediation throughout Seattle, Federal Way, Kent, Tacoma, SeaTac and nearby communities.

Emergency Mold Remediation: When Mold Can’t Wait

Most mold problems develop over weeks, but some situations need a fast response. Call us right away, 24/7, if:

  • Mold appeared after a leak, flood or sewage backup. The water source has to be stopped and the structure dried before mold spreads further. Materials that stay wet longer than 24–48 hours start to grow mold.
  • Someone in the home has asthma, allergies, a weak immune system, or is very young or elderly and the mold is in living space. Talk to a doctor about health concerns; we deal with the source.
  • Mold covers a large area, roughly more than 10 square feet, or is spreading quickly.
  • You’re selling or buying a home and an inspection found mold in the crawl space or attic, with a closing date coming up.
  • A rental unit or commercial space has mold that affects tenants, customers or staff.

In an emergency, we stop the moisture source, set up containment and HEPA air filtration to keep spores from spreading, and start drying. Removal and cleaning follow, then we confirm the moisture problem is fixed so the mold doesn’t come back. Call (206) 203-6155.

Mold remediation across the Seattle area

We provide mold inspection, remediation and removal in Seattle, Tacoma, Auburn, Lakewood, Kent, Renton, Federal Way, Puyallup and the rest of King and Pierce County.

More questions about mold

Why is mold so common in Seattle homes?

Seattle’s long wet season, high humidity and many homes with vented crawl spaces keep materials damp for months, especially in crawl spaces, attics, bathrooms and basements.

Is mold dangerous?

Mold can cause allergic reactions, respiratory irritation and other health problems, especially for people with asthma or weakened immune systems. If you have health concerns, talk to your doctor.

Do you offer mold testing?

Yes. We provide air-quality testing before remediation when needed, and post-remediation testing to confirm the area is clean.

Why Choose 911 Restoration Seattle?

A trusted, local team committed to fast, professional and caring service.

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Fast Response

We're available 24/7, with an average response time of 45 minutes, to stop the damage fast.

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Local & Experienced

A local team based in Federal Way that knows Seattle-area homes and buildings.

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Certified Technicians

IICRC-certified technicians using proven restoration methods.

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Insurance Support

We document the damage and work with most insurance companies to simplify your claim.

Our Mold Remediation Process

A clear, step-by-step approach to remove the mold and keep it from coming back.

1

Call Us

Call (206) 203-6155 for a free estimate. We answer 24/7.

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2

Inspect & Contain

We locate all the growth and the moisture source, then seal off the area.

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3

Remove & Clean

We remove and clean affected materials and filter the air with HEPA equipment.

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4

Restore & Prevent

We repair the area and correct the moisture problem so mold doesn’t return.

Areas We Serve

We provide mold inspection, remediation and removal throughout Seattle and the surrounding communities, including:

Frequently Asked Questions

What's the difference between mold removal and mold remediation?

Mold removal cleans or removes visible mold. Remediation also contains the area, filters the air, removes hidden growth and fixes the moisture source, so the mold doesn’t return.

Can I remove mold myself?

Small surface spots under about 10 square feet can often be cleaned by a homeowner. Larger areas, hidden mold, and mold after sewage or flooding should be handled by a professional.

How long does mold remediation take?

Most projects take 1–5 days, depending on the size of the affected area and how much material has to be removed.

Will mold come back after remediation?

Not if the moisture source is fixed. That’s why we find and correct the leak, humidity or ventilation problem as part of every job.

Does homeowners insurance cover mold remediation?

Often, when the mold results from a sudden covered event such as a burst pipe. Mold from long-term leaks or humidity usually isn’t covered. We document everything and work with most major insurers. Call (206) 203-6155 any time, 24/7.

Google Reviews

★★★★★

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Billy Meiners
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Super responsive! Definitely would recommend.
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Seth Wiggins
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Great service and extremely knowledgeable and helpful throughout the entire process
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Guy Edwards
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Working with 911 Restoration has been great! I searched for the fastest response for water damage restoration and mold removal and found they had the best reviews. I recommend them to anybody on the Seattle area.
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Amy Smith
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Josiah and Mark are absolutely amazing! They are so professional, and really care about their jobs. You get this sense of relief knowing you are going to be taken care of when working with them! I will continue to tell my family and friends about 911 Restoration in Seattle! Thank you!!!
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Daniel Lieberman
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Very professional company that does good work is fair and transparent with pricing and accommodated our schedule. I will use them again.
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Alex McCoy
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Quick and efficient! The team at 911 Restoration was very efficient and worked well with our insurance company. They took care of everything for us regarding the water damage. The office staff kept us informed and the crew was respectful of us and our belongings. So professional. Thank you 911!!!!
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Ronit Ashkenazi
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I highly recommend working with 911 restoration. Their team is extremely responsive, professional, and communicative from start to finish. Teya, Arturo, and the team who removed the mold were great to work with. I will use their services again!
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Marie Gundersen
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Everyone 911 Restoration was timely, very professional and performed quality work. Their communication was also very good. In addition, they helped us with the company that we used to buy flooring for the bathroom and carpeting for the remainder of the house. I am back home and very pleased with everything.
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Hugh Downer
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An inspection revealed groundwater in our crawlspace. Another business never got back to me with an estimate so I call 911 Restoration. They came out the next day and gave me an estimate (Very Reasonable) and scheduled the work to begin in 4 days. Due to a snowstorm they had to delay two days, but got the work done promptly and professionally. I would contact them first in the future if I had need of their services.
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We recently had a water damage in our house and called 911 Restoration. Teya was courteous, explained what needs to be done, and answered all our questions patiently. The water mitigation crew were timely, professional, and efficient. They brought in equipment to dry the floor, removed damaged items, cleaned/sanitized, as well as thoroughly documented the damage for insurance. I would highly recommend them to anyone dealing with such a situation!

Need Help With Mold?

Call 911 Restoration Seattle now for mold inspection and remediation, with free estimates, 24/7.

(206) 203-6155 24/7 Emergency Response