Who needs a mold risk assessment
Who needs a mold risk assessment: buyers before an offer, owners after water, landlords across a portfolio, and underwriters at scale. Nobody is legally required to have one.
By situation
| You are | Worth it? | Why | What to do first |
|---|---|---|---|
| Buying a home | Yes, before the offer | It is the only assessment available before you have access, and it prices the contingency period you actually need. | Free check on the listing address, then ask for the seller's disclosure. |
| Selling a home | Yes, before listing | Fixable drivers — grading, downspouts, ventilation — are cheap to correct before market and expensive to concede in renegotiation. | Free check, then fix what the driver list says is fixable. |
| An owner who has had water | Yes | A documented event sets an evidence floor. Understanding what the record says about your property is the first step to lifting it. | Score it, then get the source corrected and the work documented. |
| An owner with no symptoms and no history | The free check, and probably nothing more | If every driver is regional and nothing about the building or its record is flagged, there is usually nothing to buy. | A hygrometer, and a perimeter walk after heavy rain. |
| A landlord or property manager | Yes, across the portfolio | Ordering units by risk beats ordering by complaint history, which is a lagging indicator by a season. | Score every unit, then run occupant intakes where the score is high. |
| An insurer or lender | Yes, at scale | Modelled estimates order a book without sending anyone to each property. | The underwriting pages cover how the modules map to coverage questions. |
| A tenant | Useful, with limits | It describes the building rather than your unit, and the disclosure module is generally inert for rentals. | The free check, plus documenting what you observe in writing to your landlord. |
| Someone with symptoms they think are related | Not the right tool | A property estimate has nothing to contribute to a health question in either direction. | See a clinician. Separately, get the building looked at by someone with a meter. |
Where anything is actually required
A mold risk score is not legally required anywhere, by anyone, in any transaction. No state mandates one, no lender requires one, and no insurer conditions a policy on one. Anybody telling you otherwise is selling something.
What is required in most states is a seller's disclosure — a statement of known defects and past problems — and requirements are set state by state rather than nationally. Pennsylvania, New Jersey and Delaware each use their own statutory form. A minority of states operate closer to caveat emptor, where a seller must not actively conceal a defect but need not volunteer one.
That distinction matters because the two get conflated in marketing. The disclosure is the legal instrument and it records what the seller knows and admits. A risk score is a private estimate you commission for your own decision-making, and it carries no legal weight in either direction.
The one place something adjacent is sometimes required is post-remediation clearance, where an insurer, a lender or a local authority may condition sign-off on independent verification that completed work met its scope. That is a clearance requirement, not a risk-score requirement.
Who genuinely does not need one
Anyone about to pay for a full moisture survey anyway. If a specialist with a meter and a thermal camera is already booked for the property, the modelled estimate's job — deciding whether that is worth buying — has already been done.
Anyone who can smell or see the problem. Musty odour is the volatile output of an active colony, and staining is a record of water that has already arrived. Both are direct evidence, and neither is improved by an estimate.
Owners of new construction in a dry climate with no water history, beyond the free check. The 2020s carry the lowest base vulnerability in the model, and a low-burden region with well-drained ground leaves very little for a paid report to add.
Coverage — can you score any address
Any US address can be scored. What varies is depth. The full four-module model runs in Pennsylvania, New Jersey and Delaware, where the terrain profiles are built out and the state disclosure forms can be parsed.
Outside those three states a score covers regional moisture load, terrain and drainage, and building vulnerability — but not the disclosure layer, which is the largest module. The report states which modules were analysed rather than presenting a partial score as a complete one.
No permission is needed for any of it. Everything read is public record or commercially available property data, and nothing about the check touches the building or notifies anyone.
Questions people ask
- Is a mold risk report required when selling a house?
- No. What most states require is a seller's disclosure of known defects, and the requirements are state-specific. A risk score is a private estimate with no legal standing.
- Can anyone get a mold risk score for a property?
- Yes. No ownership, permission or relationship to the property is required, because the data read is public record or commercially available.
- Can I get a mold risk score for any address?
- Any US address, at varying depth. Full four-module scoring runs in Pennsylvania, New Jersey and Delaware; elsewhere the disclosure module is unavailable and the report says so.
- Do I need one if I am already getting a home inspection?
- The free check, yes — it takes seconds and it tells the inspector where to start. A paid report adds most where a seller's disclosure exists to be parsed.
- Will my insurer ask for one?
- Not currently, anywhere we are aware of. Insurers ask about claim history and, after a loss, sometimes about independent clearance. Neither is a risk score.