You inspect a home guided at a number you can afford, fall for it, pay for building and pest reports and legal review, then watch it sell far above the guide. That experience has a name, it is regulated in Australia and there are concrete ways to protect yourself before money leaves your account.
What Underquoting Is and Why It Happens
Underquoting is advertising or quoting a property below the agent's own reasonable estimate of its likely selling price. The commercial logic is simple: a lower guide pulls a bigger crowd, more competition lifts the result and the campaign looks like a triumph. The cost lands on the buyers who spent money and hope on a property that was never realistically in their range.
Not every gap between guide and result is underquoting. Markets move inside a campaign and competitive auctions genuinely overshoot. The question that matters is whether the guide was honest against the evidence available when it was set.
The Rules: NSW
New South Wales runs a specific underquoting regime. The agent must record a reasonable estimated selling price in the agency agreement, advertised guides cannot sit below that estimate and the estimate must be backed by evidence such as comparable sales. Where a range is quoted, the top cannot exceed the bottom by more than 10 per cent, and vague come-ons like "offers over" are restricted. Penalties for breaches have been increased substantially. The detail is on the NSW Government's price estimation and underquoting page.
The Rules: Victoria
Victoria attacks the problem with disclosure. Every residential listing must carry a statement of information showing an indicative selling price, the three comparable sales the agent considers most similar and the suburb median. The advertised price cannot sit below the indicative selling price, the vendor's asking price or a written offer the vendor has already rejected. Consumer Affairs Victoria runs a permanent underquoting taskforce; its consumer guidance is at understanding property prices and underquoting for buyers.
Other states and territories lean on general misleading-conduct rules under the Australian Consumer Law rather than dedicated regimes, so the buyer-side checks below matter everywhere.
The Warning Signs
- The guide sits well below recent comparable sales with nothing about the property to explain it. This is the single most reliable signal.
- The comparables look wrong. In Victoria, check whether the three properties on the statement of information genuinely resemble the one for sale; unrenovated comparables under a renovated listing is a classic tell.
- The guide does not move after strong open-home crowds or after you learn offers above the guide were rejected.
- The agent talks around the number: "interest above the range", "the market will decide", "bring your best offer". Sometimes honest, sometimes a hedge on a guide nobody believes.
What You Can Actually Do
Before you spend: read the comparable sold prices yourself, the full method is in our guide to checking a property's price before you make an offer, and treat every guide as marketing until the evidence agrees with it. Ask the agent what the guide is based on; in Victoria, ask for the statement of information if it is not displayed.
When the stakes justify it: get an independent read on the realistic range before committing to inspections and legal review. An Independent Price Check at $149 typically costs less than the building and pest report you might otherwise waste on a property guided $100,000 below where it will land. Heading to auction on a home you want, Negotiation Support builds the full evidence base and a bidding ceiling around it; the auction-day discipline itself is covered in buying at auction with a price opinion.
After the fact: if you believe a campaign was underquoted, keep the listing, the quoted guide, any statement of information and the result, and report it to NSW Fair Trading or Consumer Affairs Victoria. Enforcement is real, but it compensates the market, not your lost inspection fees, which is why the prevention steps above do the heavy lifting.
The one-line defence: never budget off the guide. Budget off what genuinely similar properties actually sold for, and let an independent set of eyes check that evidence when the decision is big enough to matter. Our guide to whether an agent's number is right covers the same discipline from the vendor side.