What follows are our own general observations and opinions about discovering mold after buying a home in California. It is not legal advice, and it is not a definitive statement of California law. Every transaction is different and every situation depends on its own facts.
You have options, but they are narrower than most buyers expect, and the clock on them is shorter than people assume. In our experience the question is almost never “was there mold” — it is “who knew about it before closing, what were they required to say, and can that be proved now.” Those three questions decide almost every case of this kind we see.
The instinct after finding mold in a house you have just bought is to look for someone to blame. That is understandable. But California’s disclosure system is built around what a seller actually knew, not around what was objectively true about the property, and that distinction does a great deal of work. A seller who genuinely did not know about a leak behind a wall is in a very different position from one who painted over a stain the week before listing.
Who might be responsible
There are usually four candidates, and they carry very different levels of exposure:
- The seller. The main target in most cases. Our reading of the Transfer Disclosure Statement obligations in Civil Code section 1102 and following is that a seller must disclose known material facts affecting value or desirability, and that prior water intrusion and mold sit squarely inside that. The fight is over knowledge.
- The listing agent. Agents owe their own duties, including a duty to conduct a reasonably competent visual inspection of accessible areas and disclose what it reveals. An agent who saw staining and said nothing has a real problem.
- The home inspector. Exposure here is usually limited by the inspection contract, which commonly caps liability at the fee paid and excludes anything not visually accessible. Those clauses are not always enforceable, but they are a serious obstacle.
- A prior remediation contractor. Occasionally relevant where work was done badly and the paperwork survives — and that paperwork is often the best evidence that the seller knew.
Knowledge is the whole ballgame
Because the duty runs to known facts, the evidence that matters is evidence of what the seller knew. In the cases we see, that tends to come from a small number of places: prior insurance claims on the property, invoices from plumbers or remediation companies, permit records, email or text traffic with agents, and statements from neighbors or tenants who remember the leak.
Physical evidence of concealment carries real weight too. Fresh paint over one patch of a wall, new drywall in a single corner of a garage, a section of baseboard replaced and nothing else — these are the details that turn a weak case into a workable one, and they are also the details that disappear fastest once remediation begins. Photograph everything before anyone touches it.
Be aware that “as-is” language is often waved around at this point, and it is less powerful than sellers tend to believe. Our understanding is that an as-is clause allocates the risk of defects the buyer could have discovered, but does not license a seller to conceal known material facts. A seller who affirmatively hid something is not usually protected by having sold as-is.
Los Angeles makes this a common problem
The local housing stock produces this fact pattern constantly. A great deal of the single-family stock across the Valley, the Westside and the older eastern neighborhoods is pre-1978 construction with galvanized supply lines and cast iron drains that fail slowly. Slab-on-grade postwar houses produce slab leaks that wick into flooring for months. Additions and garage conversions — many of them done without permits — frequently have poor flashing and no vapour barrier, so the wall assembly stays wet.
All of that means moisture problems in Los Angeles houses are often long-running rather than sudden, which cuts both ways. Long-running damage is harder for a seller to plausibly claim ignorance of. It is also harder to date, and dating it is exactly what you will be asked to do.
Timing, and why it matters more than people think
Two clocks run at once and they are easy to confuse. There is the limitations period for bringing a claim, and there is the practical window during which evidence still exists. The second one usually closes first.
Our reading is that the limitations period for a fraud or concealment claim generally runs from discovery rather than from closing, which helps buyers — but discovery rules are fact-specific and disputed often, and we would not want anyone relying on a generous reading of them. On the practical side, most purchase agreements contain a mediation condition and an arbitration clause, and failing to mediate before filing can affect your ability to recover attorney’s fees. Read your contract before doing anything procedural.
The other timing issue is remediation. You will usually want the mold gone quickly, for good reason, and doing so destroys the evidence. The workable compromise is generally to document thoroughly and get an independent assessment before remediation, so that the condition is preserved on paper even after it is fixed in fact.
What we generally suggest
Photograph and video everything before any work starts, including inside wall cavities once they are opened. Get an independent industrial hygienist or a qualified inspector to document the extent and, where possible, the likely duration of the moisture intrusion — an opinion that the damage is years old is far more useful than a photograph of a stain. Pull the permit history for the property and check for additions that never got signed off. Order a claims history if you can. Keep the seller’s disclosure documents and the inspection report together, because the case usually lives in the gap between what those two say.
And request repair records in writing rather than by phone. Sellers and agents sometimes answer written questions more carefully than spoken ones, which is useful either way.
Being candid about the difficulties
We would rather set expectations honestly than sell optimism. Proving what a seller knew is genuinely hard when there is no paper trail, and plenty of sellers really did not know. Remediation costs are often smaller than the cost of litigating over them, which makes proportionality a real consideration rather than a rhetorical one. Inspector liability caps frequently make that avenue uneconomic. And if the mold was visible on a walkthrough and you waived inspection contingencies, expect that to be raised against you hard.
None of that means a claim is not worth investigating. It means the investigation should come first, and the decision to litigate second — not the other way round.
Talking it through
If you have found mold in a California home you recently bought and want help working out whether there is a claim worth pursuing, we are glad to look at the documents with you. Our office is at (310) 556-9692. Where a matter of this kind proceeds as a claim against a seller or agent, we generally work on a basis where fees come out of any recovery rather than being paid up front, with costs addressed separately, and the arrangement is always set out in a written fee agreement before anything begins. No outcome is ever guaranteed, and past results do not predict future results.
Related reading: Real estate · Toxic mold and habitability · When a seller did not disclose mold · How to document a mold problem · Types of mold testing
As above, this reflects our general opinions and observations only. It is not legal advice, it is not a definitive statement of California law, and reading it does not create an attorney-client relationship between us. Disclosure obligations and the deadlines that apply turn on the specific facts of your transaction and the wording of your contract, and we would encourage you to have both reviewed before relying on any of this.
If the property is tenanted, habitability duties may also apply. Our Los Angeles habitability lawyers page explains what your landlord is responsible for and what a claim can include.
TALK TO A LOS ANGELES ATTORNEY
Tell us what is happening and we will get back to you. Your consultation is free, and we will tell you honestly whether we think you have a case worth pursuing.
