If you are selling a NSW home with mould, or a history of it, talk to your conveyancer about disclosure before the contract is drawn up, and deal with the moisture source rather than painting over the stain. Your agent cannot mislead buyers or stay silent about known issues a buyer would reasonably want to know, and a buyer’s inspector with a moisture meter is likely to find active damp anyway. A documented chain of inspection, repair and independent verification usually protects the sale better than concealment.
This is general information, not legal advice. Your solicitor or conveyancer should advise on what your contract needs to say.
What the rules say
A NSW contract for sale must include prescribed documents, such as the title search, drainage diagram and zoning certificate, and NSW Government guidance says a solicitor or conveyancer should prepare it before the property is advertised. Mould is not one of those prescribed documents.
The sharper obligations sit with the agent selling for you. NSW Government guidance on agent misrepresentation says:
- Agents must not induce a sale by a false or misleading statement, or by failing to disclose a prescribed material fact they know or ought reasonably to know.
- The prescribed material facts include that the property has been subject to flooding from a natural weather event within the last 5 years, and that it is subject to significant health or safety risks.
- Beyond that list, silence can itself be misleading: agents must not conceal information that a buyer would reasonably be concerned about and that is not readily apparent.
- If a buyer asks a question and the agent knows the answer, the agent must answer frankly and fully.
In practice, if you tell your agent about past leaks, flooding or mould treatment, expect them to answer a buyer’s question about it honestly. Whether anything should also go in the contract is a question for your conveyancer.
Fix, disclose, or both
Surface mould with a clear, fixable cause. Bathroom ceiling mould from an unducted or undersized fan, or bedroom mould from condensation, is usually straightforward: fix the ventilation, treat the area properly, and keep the paperwork.
Mould from a building moisture problem. Rising damp, a failed shower membrane, a chronic roof leak or poor subfloor drainage need a trade to fix the cause as well as remediation of the mould. Get the scope understood early, because these jobs take longer and buyers will ask about them.
Selling as is. You can sell with known mould, but do it with advice and in the open. A buyer who knows about a problem prices it in; a buyer who discovers it after an inspection renegotiates, withdraws, or raises it later.
Common seller mistakes
- Painting over mould. Paint hides the stain, not the damp. A building inspector’s moisture meter still reads high, and the stain usually returns.
- Treating the mould but not the cause. Without fixing the leak, fan or drainage, it comes back within a wet season; see why mould comes back after treatment.
- Relying on the remediator’s own sign-off. A clearance note from the contractor who did the work is weaker evidence than an independent check.
- Assuming the buyer’s inspector will miss it. Buyers’ building reports cover the accessible interior, roof space and underfloor, and buyers can add a dedicated moisture inspection; see the pre-purchase mould inspection guide for what they look for.
Pre-sale inspections and “clearance certificates”
A pre-sale mould inspection and moisture assessment looks at the property the way a buyer’s inspector would: wet areas, ceilings under the roof, the subfloor where accessible, and moisture readings and thermal imaging to find damp that is not visible. You get a written report with photos and readings, and a clear picture of what to fix before listing. Inspections through this site are carried out by an independent local contractor who reports in their own name.
There is no legally required “mould clearance certificate” in NSW. What vendors usually mean is a report recording that the property was inspected and either no significant mould or damp was found, or that remediation was completed and then independently verified. It describes the condition on the day; it is not a warranty against future mould, so keep it recent relative to your listing. NSW Government guidance on inspection reports notes that a vendor’s pre-sale report can help buyers but is not a substitute for their own independent report, so expect buyers to inspect regardless.
The paperwork buyers value
| Document | What it shows |
|---|---|
| Inspection report before the work | What was found, where, moisture readings and photos |
| Trade invoices for the cause | The leak, membrane, fan or drainage was actually fixed |
| Remediation scope and invoice | What was removed, cleaned or replaced |
| Independent post-remediation verification | The area was confirmed clean and dry by someone other than the remediator |
Together these tell a simple story: problem found, cause fixed, mould removed, result checked. Give copies to your conveyancer and agent so questions get consistent, accurate answers. If remediation is needed, mould remediation covers what a proper job involves.
Frequently asked questions
Do I have to disclose mould when selling my house in NSW?
Ask your conveyancer about the contract itself. Separately, NSW agents must not mislead buyers or conceal information a buyer would reasonably be concerned about, must answer questions frankly if they know the answer, and must disclose prescribed material facts such as flooding within the last 5 years or significant health or safety risks.
Can I sell a house with mould as is?
Yes, with advice and in the open. Buyers can price in a known problem; the risk sits with concealing a significant problem you know about.
What is a mould clearance certificate?
It is not a legal document in NSW. It usually means an independent report recording that the property was inspected and found free of significant mould, or remediated and then verified. It shows the condition at that date and does not guarantee the future.
Will painting over mould before listing solve it?
No. Paint hides the stain but not the moisture. A building inspector’s moisture meter will still find it, and it can turn a fixable issue into a credibility problem.
Will mould affect my sale price?
It depends on the extent, the cause and whether it has been properly fixed with paperwork to show it. A treated bathroom ceiling with the fan fixed and documented is a minor point; active rising damp or a chronic leak is a negotiating point for any informed buyer.
If you want to know what a buyer’s inspector will find before you list, describe the property and any mould history on the quote form and an independent local contractor can quote a pre-sale inspection.