Mold Inspection in Spokane

An inspection and a test are not the same thing. A test is a sample sent to a lab. An inspection is the diagnostic work of walking a building, finding where water is getting in or condensing, and determining whether what you are looking at is a problem. The lab tells you what. The inspection tells you why, and why is the part that has to be fixed.

We do inspections and we do the sampling that goes with them. We do not do remediation, and we take no referral fee from anyone who does. That means the inspection is the product. There is nothing behind it we are trying to sell you.

The inspection is a water investigation

Mold is not a mystery organism. It is a decomposer that needs a food source, which in a house means drywall paper, wood, dust, or insulation, and it needs moisture. The food source is everywhere in every building. Moisture is the only variable. So the entire inspection is organized around one question: where is this building getting wet, and for how long at a time.

Materials that stay wet longer than roughly 24 to 48 hours start supporting growth. That is the clock we are working against, and it reframes the problem. A slow drip under a sink that never dries is worse than a burst pipe that got dried out properly in a day.

In Spokane specifically, the water sources cluster in predictable places.

Winter failures. Sustained hard freezes plus 43.9 inches of average annual snow. Frozen and burst pipes account for about 7% of US insurance claims nationally, and burst pipes are the third most costly loss event in the country at roughly $1.4 billion a year. Ice dams form when attic heat melts snow at the roof deck and the meltwater refreezes at the cold eave, then backs up under the shingles into the sheathing and the top plates.

Spring melt. Saturated soil against a foundation, especially on a lot that grades toward the house or where downspouts discharge two feet from the wall.

Crawlspace ground moisture. Extremely common in the pre-1970 stock. A crawlspace with a torn, gapped, or missing vapor barrier is evaporating soil moisture into the building continuously.

Age. Single-family detached homes in the City of Spokane average roughly 70 years old, and about 27% of the city's housing predates 1950. Old supply lines, old drain connections, old flashing, old windows.

Appliances. Dishwashers, washing machines, water heaters, refrigerator ice lines. Climate has nothing to do with these.

Across Spokane and Kootenai counties, the insurance data suggests roughly 3,100 to 4,500 water damage claims a year, and the American Housing Survey indicates most water damage is never claimed at all.

Why your home inspector sent you here

If you are reading this because a home inspection report said "possible microbial growth observed, recommend evaluation by a qualified specialist," that was not your inspector being cautious. It is what the rules require.

WAC 308-408C-030 excludes environmental hazards, including mold, from the Washington standards of practice for home inspectors. WAC 308-408C-050 goes further and requires that every pre-inspection agreement state in writing that the inspection does not include an investigation for mold unless separately contracted. Your inspector is prohibited by the scope they operate under from telling you what that stain is.

Idaho licenses neither mold work nor home inspection, so on the Kootenai County side the boundary is even less defined. In both states, that gap is exactly where an independent assessor belongs.

What happens during the visit

A typical residential inspection runs one to two hours on site. Complex or larger properties take three to four. Here is the sequence.

History first

Before any equipment comes out, we walk through the timeline with you. What did you notice, and when. What changed in the house before that. Any past leaks, any repairs, any remodels. Which rooms feel different. Whether the smell is stronger in the morning or after the furnace runs. That last detail alone often points to a specific mechanical pathway.

Visual assessment of the whole envelope

Exterior grade and drainage, downspout discharge, foundation penetrations, roof edge and flashing, siding at the base of walls. Then interior: under every sink, behind toilets, at tub and shower surrounds, around window sills, at the base of exterior walls, in closets on exterior walls where air circulation is poor.

Moisture mapping

Pin meters for direct probing where a small pinhole is acceptable, pinless scanning meters for reading through intact finishes. We map, meaning we take readings in a grid across a suspect area and compare them to dry reference readings from the same material elsewhere in the house. A single number is worthless. A pattern of elevated readings that gets stronger toward one corner is a map to the source.

Thermal imaging

An infrared camera does not see moisture. It sees temperature. Wet material evaporates and evaporation cools, so damp areas inside a wall usually read colder than the material around them. It also shows missing insulation, thermal bridging, and air leakage paths, all of which cause condensation in a Spokane winter. Every thermal finding gets confirmed with a moisture meter before we call it anything.

Borescope where needed

When surface readings and thermal imaging disagree, or when the suspect area is a sealed wall cavity, a chase, or behind a shower pan, a small camera on a probe goes through a discreet hole so we can look rather than guess.

Psychrometric readings

Temperature, relative humidity, and dew point in each zone, plus outdoors. Dew point is the operative number. If the interior air's dew point is above the surface temperature of an exterior wall or a window frame, that surface will get wet regardless of whether there is a leak anywhere in the house. That is a ventilation and humidity problem, not a plumbing problem, and the fix is completely different.

Sampling

If sampling is warranted, air samples are collected with a calibrated pump pulling a measured volume through a spore trap cassette, Air-O-Cell or Allergenco-D, and sent to an accredited lab for direct microscopic examination. Every job includes an outdoor control sample, because outdoor air always contains spores and an indoor count is not interpretable without a same-day baseline from outside your own house. Where there is visible growth, a tape lift or swab confirms what it is.

Sometimes the honest recommendation is not to sample. If we find an active leak and obvious growth on the wall it soaked, a lab report tells you nothing you do not already know. We will say so rather than add $100 samples to the invoice.

Pricing

The base inspection is $425 and includes one indoor air sample plus an outdoor control. Additional samples are $100 each, and a typical three sample job lands around $525. Homes over 3,000 square feet run $550 to $650. Post remediation clearance for restoration partners is $375 flat for up to three samples. Rush 24 hour lab turnaround adds $100. There is no trip fee anywhere we travel.

Lab results normally return in one to three business days and the written report follows within a day of that.

What the report gives you

Photographs tied to locations. Moisture readings with the dry reference values beside them. Thermal images with the corroborating meter data. Lab results with the outdoor control shown next to the indoor samples so the comparison is visible rather than asserted. A written interpretation in plain language. And a description of the moisture source and the affected area, scoped clearly enough that any qualified remediation contractor can bid it against the IICRC S520 standard without needing to re-inspect.

That last part is why independence pays for itself. A report from a company that also bids the work is a sales document, whether it intends to be or not. Washington and Idaho both allow one company to assess and remediate the same job. New York made that illegal under Labor Law Article 32 for exactly this reason. Here you have to choose it.

Frequently asked questions

Do I need an inspection, or just a test? If you know where the water is and you can see the growth, you may need neither. If you have symptoms, a smell, or a stain and no explanation, you need the inspection. Sampling without a diagnostic walkthrough produces numbers nobody can act on.

Will you cut into my walls? Only with your permission, and only a borescope port about the size of a dime in a spot you choose. We are not doing demolition.

Can you tell me how long the leak has been there? Sometimes, within a range. Staining patterns, material degradation, and growth maturity give useful evidence. We will describe what we observed and stop short of a precise date we cannot support.

Do you inspect commercial buildings and rentals? Yes. Multi-unit and light commercial work is routine, including landlord and tenant disputes where an independent third party is the whole point.

How far do you travel? All of Spokane County and Kootenai County, Idaho, including Coeur d'Alene, Post Falls, and Hayden. There is no trip fee anywhere we travel.

What if the problem turns out to be humidity, not a leak? Then that is what the report says, and the fix is ventilation, source control, and sometimes a dehumidifier rather than opening walls. Getting that distinction right is most of the value of a real inspection.

Schedule an inspection

Tell us what you are seeing and where. We will tell you honestly whether an inspection is the right call, what it will cost, and when we can be there.