The building inspector’s report reaches the agent on a Tuesday. By Wednesday the buyer’s solicitor is asking why a moisture reading behind the linen cupboard never appeared anywhere in the contract. Selling a house with mould is rarely what breaks a sale — being asked about something you already knew and didn’t mention is what breaks it.
Most mould found before a sale is minor, disclosable and entirely survivable. The part carrying real consequence is much narrower: what you knew, when you knew it, and whether it made it into the Section 32. (General information, not legal advice for your specific sale.)
Selling a House With Mould: Why Painting Over It Backfires
The instinct before a sale is to make the house look its best, and a fresh coat of paint over a stained patch feels like tidying up rather than concealing anything.
The trouble is that mould is rarely just a stain. It typically means there is, or was, a moisture source behind the surface, and paint does nothing to that source. A buyer’s own building inspector is likely to find the same damp reading or the same smell that prompted you to paint over it in the first place — except now it looks like something was hidden rather than simply unaddressed, which is a considerably worse position to negotiate from.
The Legal Concept That Actually Matters: Material Facts
Victorian law requires more from a vendor than the title and zoning details in a standard contract.
Consumer Affairs Victoria has published guidance on material facts — information that would genuinely influence a reasonable buyer’s decision to purchase, or the price they’d be willing to pay. Known structural defects are commonly cited in that guidance as exactly the kind of thing that qualifies. Mould you are aware of, particularly if it stems from a structural or moisture issue rather than a one-off spill, sits squarely in that category rather than being a cosmetic detail you can leave for the buyer to discover.
What “Knowingly” Actually Means
The obligation attaches to what you know, not to what a forensic investigation might eventually turn up.
If you are unaware of a colony growing quietly inside a subfloor or wall cavity, you have not concealed anything — you simply do not know. But if you have already had it pointed out, whether by a tenant, a previous inspection, or your own eyes, that knowledge is what creates the obligation. This is precisely why getting a professional assessment before you list is a double-edged consideration worth thinking through deliberately: it gives you the clearest possible picture of what you are selling, but it also converts anything found into a fact you now know and must disclose.
The Section 32 Statement
Before a buyer signs anything, Victorian law requires you to give them a Section 32 statement.
Consumer Affairs Victoria explains that this document, required under the Sale of Land Act 1962, must be factually accurate and complete — and that if it contains incorrect or insufficient information, a buyer may be able to withdraw from the sale or take legal action against you. Your conveyancer or legal practitioner prepares this document, and it is the natural place for a known mould issue to be recorded rather than mentioned in passing at the open house.
Why “It’s Fine Now” Doesn’t Close the Question
Mould that has been cleaned before photos are taken is not the same as mould that never existed, and the distinction matters more than it might seem.
If the visible growth has gone but the moisture source has not been addressed, mould can be present again inside the wall or subfloor with no surface sign at all, which means a buyer’s inspector may still detect elevated moisture readings even after a thorough clean.
A supermarket-spray clean-up tends to remove the visible colony without touching the root system underneath, so DIY treatment often looks resolved without actually being resolved. “We fixed it” and “it’s actually resolved” are frequently two different claims, and only one of them is defensible if a buyer asks directly.
Getting Ahead of the Buyer’s Own Inspection
Increasingly, buyers arrange their own building and pest inspection before making an offer, and mould is one of the things those reports flag.
The more useful position for a vendor is knowing what that inspection will find before it happens, rather than discovering it alongside the buyer. Formal mould and air quality testing tells you the actual extent of any issue, gives you accurate information for your Section 32 statement, and — where the finding is minor — gives you the chance to have it properly remediated before it ever becomes a negotiating point.
Conclusion
Selling with mould is rarely the deal-breaker people assume it is; failing to disclose something you already knew about is the part that actually causes trouble, both for the sale and afterwards. Getting ahead of what a buyer’s own inspector will find, before you list rather than after an offer is on the table, is the more comfortable position to sell from — and booking a pre-purchase-style mould inspection yourself is a sensible way to get there.
Frequently Asked Questions (FAQs)
Do I have to disclose mould when selling my house in Victoria?
If you are aware of mould linked to a structural or moisture issue, it is likely to qualify as a material fact under Consumer Affairs Victoria’s guidance, which generally must be disclosed to a prospective buyer. If you genuinely have no knowledge of an issue, there is nothing to disclose — the obligation attaches to what you know, not to hidden problems no one has found.
Can a buyer pull out of a sale because of mould found after signing?
If mould-related information in your Section 32 statement was incorrect or insufficient, a buyer may be able to withdraw from the sale or pursue legal action, depending on the circumstances. This is one of the practical reasons an accurate, complete statement matters more than an optimistic one.
Will a small patch of mould stop my house from selling?
A small, disclosed, well-explained issue rarely derails a sale on its own, especially if you can show it has been assessed or addressed. What creates real difficulty is a buyer discovering something during their own inspection that wasn’t mentioned to them beforehand.
Should I fix mould before listing my house or disclose it and let the buyer decide?
Both are legitimate approaches, and the right one depends on the scale of the issue and your timeline. A minor problem is often worth remediating properly before listing, while a more extensive one may be better disclosed with supporting documentation so the buyer can factor it into their offer with accurate information.