Water Damage Restoration Bothell has been remediating mold in Redmond homes and commercial properties since 2009. Over 15 years, we've inspected and remediated mold in every part of Redmond's 98052 and 98053 zip codes — from Education Hill townhomes with inadequate bathroom ventilation to Overlake commercial buildings with HVAC condensation problems, from mid-century Idylwood homes with slow crawl space moisture infiltration to newer Bear Creek residential construction where a single missed water damage event led to mold behind walls. We are licensed, bonded, insured, and IICRC certified — family-owned, with a one-year labor guarantee on every remediation project.
Mold does not stop growing on its own. Call us and we'll inspect fast.
Mold in a Redmond home is a predictable consequence of the Pacific Northwest's climate — not a sign of negligence. Redmond receives over 35 inches of precipitation annually, its clay soils drain slowly, and the Sammamish River corridor raises ambient humidity in nearby neighborhoods throughout the wet season. In Redmond's newer construction, tight building envelopes mean moisture that gets in stays in longer than it would in an older, leakier building. That combination creates conditions where a single missed water event — a slow toilet supply line, condensation on a cold basement wall, a failed window flashing — can produce significant mold growth inside wall cavities before it's ever visible on the surface.
We're based in Bothell, 10–15 minutes from most of Redmond, and we bring the full remediation package on the first visit — containment equipment, negative air machines, HEPA vacuums, antimicrobial treatments, and air sampling kits. We work with City of Redmond Development Services on any permits required for structural remediation work, and we provide post-remediation lab-certified clearance testing so you have documentation, not just our word, that the job is done. Call any time: (425) 490-8436.
Water Damage Restoration Bothell is a family-owned company with over 15 years of mold remediation work in Redmond and surrounding King County communities. Our mold remediation sub-services include: visual inspection and non-invasive moisture scanning, air quality and surface sampling for certified lab analysis, containment setup with negative air pressure and HEPA filtration, physical mold removal from all colonized materials, structural drying of remaining moisture, EPA-registered antimicrobial treatment of all affected surfaces, post-remediation clearance air sampling and lab verification, and crawl space vapor barrier assessment and encapsulation. All technicians are direct employees trained in IICRC AMRT protocols — no subcontracted mold work at any stage.
The company was founded in 2009 by a Bothell contractor who built the business on one principle: mold remediation done correctly the first time costs less and causes less disruption than remediation that needs to be repeated. Our lead technicians hold current IICRC Applied Microbial Remediation Technician (AMRT) certification. We carry full general liability insurance and contractor's bonding, with a one-year labor guarantee.
Local knowledge shapes every Redmond mold project. Redmond's 2000s and 2010s construction era brought tight building envelopes, spray foam insulation, and moisture-resistant building wrap — materials intended to keep moisture out. When moisture gets past those barriers (and it does, through window flashing failures, improperly flashed penetrations, and condensation at thermal bridges), it has nowhere to escape. Mold develops fast in sealed cavities with trapped moisture. Education Hill and Bear Creek's HOA-managed townhomes present a specific challenge: shared walls between units mean mold found in one unit's bathroom cavity may extend into the adjacent unit's wall — but HOA authority over shared walls sometimes makes remediation logistics complicated. We've navigated these situations in Redmond and know how to scope them correctly.
In Redmond's 98052 zip code, mold patterns follow the neighborhood character. In Idylwood — Redmond's oldest neighborhood, with mid-century homes along Lake Sammamish — original crawl spaces often have thin or deteriorated vapor barriers, original single-pane windows with chronic condensation, and old plumbing fixtures with slow drips that have gone unnoticed for years. Mold in Idylwood homes often has more extensive reach into structural framing than in newer construction, simply because the conditions have persisted longer. In the Overlake commercial district, mold problems often involve HVAC condensate drainage failures in complex mechanical systems — the kind of problem that develops slowly over months and suddenly reveals itself through ceiling tile staining or a musty smell in a data center antechamber.
In Redmond's 98053 zip code, Education Hill and Bear Creek see mold most commonly in shared-wall residential buildings where bathroom exhaust ventilation is inadequate for the humidity levels produced by multiple residents sharing plumbing stacks, and in attic spaces where inadequate ventilation creates condensation on the underside of roof sheathing during temperature swings. These attic mold scenarios are especially common after a particularly cold winter in Redmond — the temperature differential between heated living space and cold attic air drives moisture into the attic through ceiling penetrations and condenses on the OSB sheathing. We inspect attics as a standard part of every Redmond mold assessment.
Permit requirements for mold remediation in Redmond: the remediation process itself (inspection, containment, cleaning, treating) does not require a permit. Structural repairs that result from mold damage — replacing sheathing, reframing portions of walls, replacing roof structure — do require permits through City of Redmond Development Services. We identify what permits are required during the initial inspection and manage the entire permit process as part of the project scope at no additional management fee.
We combine visual inspection with non-invasive moisture scanning and certified air quality sampling. For Redmond's newer construction with tight wall cavities and spray foam insulation, we pay particular attention to window flashing zones, plumbing penetrations, and attic spaces — the areas most prone to hidden mold growth in this building vintage. Lab reports from a certified industrial hygiene laboratory accompany every inspection.
Schedule a mold inspection →Before any mold removal begins, we establish poly sheeting containment barriers and run HEPA-filtered negative air machines that exhaust out of the work zone. In Redmond condos and HOA townhomes — where HVAC systems often serve multiple units and shared ductwork is common — containment is especially critical to prevent spore migration into adjacent units during the remediation work.
Learn about containment →HEPA vacuuming of all surfaces, hand-wiping with abrasive sponges on framing members, and removal of mold-colonized materials that cannot be cleaned in place — OSB sheathing with deep fungal penetration, drywall with mold on both faces, saturated insulation. Materials are sealed in poly bags and disposed of per Washington State Department of Ecology guidelines for biohazardous waste.
Ask about mold removal →After mold removal, HEPA air scrubbers run continuously while surfaces receive EPA-registered antimicrobial treatment. Post-remediation air samples go to the certified lab — you receive the lab report showing indoor spore counts before and after. In Redmond, this documentation is especially important for homeowners selling a property, filing an insurance claim, or managing a commercial tenant's occupancy concerns.
Ask about clearance testing →Redmond homes with crawl spaces — particularly older construction in Idylwood and some Bear Creek properties — often have original polyethylene vapor barriers that are torn, inadequately lapped, or simply too thin for the ground moisture levels in Redmond's clay-soil environment. We assess existing vapor management, remediate any mold on crawl space framing, and install heavy-duty encapsulation systems that prevent ground moisture from reaching structural wood members.
Learn about crawl space encapsulation →In Education Hill and Bear Creek townhomes, mold in a shared wall creates a multi-party remediation scenario involving the unit owner, the HOA, and often the HOA's master insurance policy. We document source and extent clearly enough to establish responsibility, and we communicate with HOA management directly — providing the scope, containment plan, and schedule documentation that HOAs require before authorizing work on shared structural elements.
Ask about HOA mold scenarios →Call (425) 490-8436 and tell us what you're seeing or smelling at your Redmond property. We schedule an on-site inspection typically within 24–48 hours, arrive with moisture scanning tools and air sampling equipment, and provide a complete written assessment of what we find — including the moisture source, extent of colonization, and recommended remediation scope.
We walk the property with you, show you every area of concern, and explain the findings in plain language. You receive a written scope with itemized pricing before any work is scheduled. For HOA-involved scenarios in Redmond, we also provide the documentation package required for HOA authorization at this stage so you can get board approval without delays.
Containment barriers and negative air machines go in before remediation begins. If we can correct the moisture source directly at this stage — a failed exhaust fan, a dripping supply line, inadequate crawl space drainage — we do it first. Starting mold removal without correcting the moisture source is the primary reason remediation needs to be repeated.
HEPA vacuuming, physical removal of colonized materials, hand-cleaning of all structural members, and EPA-registered antimicrobial application throughout the work zone. Air scrubbers run continuously from setup through treatment completion. We photograph the process at each phase for your documentation file.
Post-remediation air samples go to the lab, and we don't issue a completion certificate until the results confirm clearance. Our one-year labor guarantee covers all work performed — if mold returns in any area we remediated during the guarantee period, we return at no charge and assess whether the original moisture source was corrected or a new one has developed.
A bathroom with surface mold on grout and tile caulk typically costs $400–$1,200 to remediate properly. A wall cavity with mold on drywall and framing, discovered after a leak, runs $1,500–$4,000 depending on how many linear feet are affected. An attic with mold on the OSB roof sheathing — one of the most common scenarios in Redmond's 2000s-era construction — typically costs $3,500–$7,500 including proper clearance testing. We provide itemized written estimates before work begins, and mold damage resulting from a covered water loss is often partially or fully reimbursable under homeowner's insurance. For scenarios involving HOA shared walls, the master policy may cover the structural remediation.
A bathroom or single-room project is typically complete in one to two days. A wall cavity or crawl space remediation runs two to four days including drying time. Attic remediation takes three to five days in most cases. Post-remediation clearance testing adds two to three business days for lab results before we can issue the completion certificate. Redmond's ambient humidity means we build extra drying time into crawl space and attic projects — rushing the drying phase in this climate creates conditions for regrowth.
Mold remediation work itself — inspection, containment, cleaning, antimicrobial treatment — does not require a permit. Structural repairs resulting from mold damage (replacing sheathing, reframing wall sections, replacing structural members) do require permits through City of Redmond Development Services. Electrical and HVAC repairs associated with mold source correction also require licensed trade permits and inspections. We identify what permits are required during the initial inspection and manage all applications as part of our project scope.
Spray-only treatments on attic OSB sheathing are common in Redmond because they're cheaper and faster than proper remediation — but they are not remediation. Antimicrobial sprays kill surface mold and stain it dark to show "treatment," but they cannot remove the fungal hyphae already embedded in the wood fibers, and they cannot prevent regrowth if the moisture source (inadequate attic ventilation, a missing or inadequate soffit-to-ridge airflow path) is not corrected. In Redmond's climate, an attic that had spray-only treatment will be back to visible mold growth within two to three wet seasons in most cases. We HEPA-vacuum, hand-clean, and treat — and we correct the ventilation pathway before we leave.
All of Redmond — 98052 and 98053. Downtown Redmond, Education Hill, Overlake, Willows Road corridor, Bear Creek, Idylwood, and all residential and commercial properties throughout the city. We also serve commercial properties in Redmond including office buildings, tech campus support facilities, and multi-tenant commercial buildings in the Overlake area.
This is one of the most time-sensitive mold scenarios we handle in Redmond, because it often surfaces during a transaction with a closing date that creates real pressure on scheduling. A pre-closing mold remediation needs to be scoped accurately, completed properly, and documented with clearance testing results that the buyer's inspector and lender will accept. We understand the timeline pressure of a real estate transaction and can often schedule Redmond crawl space remediations within three to five days of your call. The clearance test lab results are typically back within two to three business days of the post-remediation sampling, giving you documentation to provide the buyer before closing. Call us immediately when this situation comes up: (425) 490-8436.
Our home base — mold remediation throughout Bothell including Canyon Park, North Creek, and neighborhoods along the Sammamish River where seasonal flooding creates persistent moisture management needs.
Mold Remediation in Bothell →We serve Woodinville for mold remediation including crawl space work on acreage properties, attic mold from moss-damaged roofs, and septic backup remediation in the rural 98077 zip code.
Mold Remediation in Woodinville →Full mold remediation throughout Kirkland — including lakefront properties on Lake Washington with high ambient humidity, Bridle Trails mid-century homes, and Totem Lake area commercial properties.
Mold Remediation in Kirkland →We serve Bellevue for mold remediation — from downtown high-rise condo units to Somerset single-family homes and Factoria commercial properties along I-90.
Mold Remediation in Bellevue →Tell us where you've seen mold growth, noticed a persistent musty smell, or experienced water intrusion in your Redmond property. We'll schedule an inspection quickly, provide a complete written assessment with no obligation, and give you a free estimate with itemized scope before any work begins.
Call (425) 490-8436 — Free Estimate