Crawl Space Mold Removal in Lynnwood, WA

Crawl space mold in Lynnwood grows where damp ground and the long rainy season keep the wood under the house wet, often near creek drainages or where gutters spill against the foundation. Removal cleans the framing, replaces wet insulation and ground cover, and fixes the moisture. Call the number on this page to be connected with a local mold remediation company in Lynnwood.

Lynnwood at a glance

Lynnwood is about 15 miles north of Seattle, where I-5 meets I-405. Most of the city drains to Swamp Creek or to Puget Sound through Lund's Gulch, and Scriber Creek, Scriber Lake and Hall Lake sit inside city limits. One community profile estimates more renter households than owner households here, so a crawl space problem is often something a tenant notices and a landlord has to fix. Homes near Meadowdale's ravines or the low ground around Scriber Creek tend to deal with more groundwater than houses on higher, flatter lots.

What to do now

Owners: find the water first. Check gutters, downspouts, the grade along the foundation and plumbing under kitchens and baths.
Renters: put it in writing. Send the landlord a dated note describing the smell, any water and where you noticed it. Washington law sets time frames for landlords to start repairs after written notice. This is general information, not legal advice.
Do not crawl in to scrub a big area. EPA's homeowner guideline is about 10 square feet. Larger growth is professional work.
Keep humidity down upstairs. Run bath and kitchen fans and keep the heat on so moist indoor air is not adding to the problem.
Collect bids in writing from companies registered with L&I.

Call now to be connected with a local mold remediation company in Lynnwood.

(206) 759-5187

Crawl space with new white vapor barrier and dehumidifier, crawl space mold removal in Lynnwood, WA

Signs and what they usually point to

Sign	Common cause
Floors feel cold and damp in winter	Missing or fallen insulation over a wet crawl space
Musty odor in a ground-floor apartment or townhouse	Shared crawl space or underfloor area with poor ventilation
Mold heaviest near one foundation wall	Water draining toward the house on that side
Wet soil showing through gaps in the plastic	Ground cover never sealed at seams or edges
Spotting around a toilet flange from below	A slow leak at the wax ring or supply line

Cost factors

Angi's Seattle cost guide puts crawl space mold removal at $425 to $1,650, with HomeGuide's 2026 national range at $1,500 to $4,000. Bids rise with the area of affected framing, a low or crowded space, full insulation replacement, new ground cover and any drainage or duct work. If the job turns up rot that needs structural repair, the City of Lynnwood Development & Business Services issues the permits. Renters whose landlord leaves a home in severe disrepair can report it to Lynnwood Code Enforcement.

Crawl Space Mold Removal questions in Lynnwood

I rent. Who is responsible for mold under the house?

In general, Washington landlords must keep the structure in reasonable repair and the unit reasonably weathertight. Tell the landlord about the moisture problem in writing; state law then sets times for the landlord to start repairs. This is general information, not legal advice.

Can mold in the crawl space affect the rooms above it?

Air from under the house can move up into the living space, which is why a musty smell often shows up in the rooms above a damp crawl space. EPA says mold can irritate the eyes, skin, nose, throat and lungs, so anyone with health concerns should talk with a health professional.

How long does crawl space mold work take?

A small crawl space can often be cleaned in a day or two, but drying time is the wild card in a wet Puget Sound winter. Ask for a schedule that separates removal, drying and any new ground cover or insulation.

Can I clean crawl space mold myself?

EPA says a homeowner can usually handle a moldy area smaller than about 10 square feet once the moisture is fixed. Crawl space growth tends to cover many joists at once and comes with wet insulation and tight access, which is where Washington DOH suggests considering a professional.

More mold services in Lynnwood

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Helpful guides

Call now to be connected with a local mold remediation company in Lynnwood.

(206) 759-5187

Sources

Last updated: November 10, 2026