Mold Testing
Mold testing means taking samples — air, swab, tape-lift or a piece of the material — and having a laboratory identify and count what is in them. It is useful when you need a documented result, or when something is clearly wrong and an inspection has not explained it. It is not a substitute for finding the moisture.
Find mold testing near you
Who this is for
- You need documentation for a sale, a claim, a landlord or a dispute
- Something is affecting the building and an inspection has not located it
- You want to know what is growing, not just that something is
- Remediation has finished and you want independent confirmation
- A physician has asked for information about the environment
- You manage a commercial property with an occupant complaint on record
What the service includes
Indoor air sampling
Spore-trap samples taken indoors and compared against an outdoor control taken the same day. The comparison is the point — an indoor count on its own means very little.
Surface sampling
A swab or a tape-lift from a specific spot, which tells you what that spot is. Precise about the location sampled, and silent about everywhere else.
Bulk sampling
A physical piece of the material sent to the lab. Used where the finish has to come out anyway.
Laboratory analysis
An accredited laboratory identifies genera and counts. Ask which laboratory, and ask whether it is accredited — that is where the credibility of the result comes from.
How this differs from the others
Inspection, testing, remediation and independent clearance are four different jobs. Buying the wrong one is the most common and most expensive mistake in this category.
Testing vs inspection
A sample tells you what was in the air or on a surface at one moment, in one place. An inspection tells you where the water is. If you only pay for one, the inspection is usually the one that changes what you do next.
About inspection →Testing vs clearance testing
Clearance testing is sampling performed after remediation to confirm the work met its scope. Same instruments, entirely different purpose, and it carries an independence requirement that ordinary testing does not.
About clearance →What a result cannot establish
There is no federal standard for a safe indoor spore count, so no laboratory report can declare a building safe or unsafe. Anyone who tells you their number proves either is overselling it.
DIY test kits
A settle plate on a counter will grow something in almost any building, because spores are present in all indoor air. Without an outdoor control and a sampling protocol, the result is not interpretable.
What to expect, step by step
- 1
Decide what the sample is for
Documentation, identification, or confirmation after work. The purpose determines the sampling plan and how many samples you need.
- 2
Sampling visit
Usually an hour or two. Windows and HVAC are typically controlled beforehand, which is why sampling protocol matters.
- 3
Laboratory analysis
Two to five business days for standard turnaround; same-day exists at a premium.
- 4
Interpretation
The report should say what was found, how the indoor samples compare to the outdoor control, and what it does and does not establish.
What it costs
| Service | Typical range | What drives it |
|---|---|---|
| Air sample, per sample | $100 – $200 | Most jobs need at least two — one indoor, one outdoor control. |
| Surface swab or tape-lift | $75 – $150 | Per location sampled. |
| Inspection with sampling | $450 – $1,200 | Inspection plus a small number of samples and the lab work. |
| Post-remediation clearance | $300 – $800 | Depends on the number of contained areas being cleared. |
General US ranges for planning purposes, not quotes and not local data. Price depends on the size of the building, how much has to be opened up, and what the market charges where you live. Compare at least two written scopes before deciding.
Start with the property
An address check is free and takes a few seconds. It will not tell you whether there is mold in the building, but it will tell you which conditions are stacked against it — which is useful context to bring to whoever you hire.
A data-based estimate — not an inspection, mold test, or medical diagnosis. How this works · How we handle your address
How to choose between companies
- Ask which accredited laboratory analyses the samples.
- Ask how many samples they plan to take and why that number.
- Confirm an outdoor control sample is included — without it, indoor results have nothing to be compared against.
- Ask whether the same firm would perform any remediation the results point to.
- Ask what the report will say if the results are unremarkable.
Related
Property risk factors
Questions people ask
Not sure this is the service you need?
Answer a few questions about what you are seeing, and we will say which of the three capabilities fits — then show who performs it near you.