What is gazumping? Gazumping is the practice where a property seller accepts a higher offer from another buyer after indicating acceptance of an earlier offer, but before contracts are legally exchanged. Under Australian property law, this can occur because a property sale is not legally binding until formal exchange of contracts takes place.
As a result, verbal agreements or pre-exchange negotiations do not prevent a seller from considering competing offers. Understanding this legal position explains why gazumping is generally lawful in Australia and why buyers remain exposed until contracts are exchanged—often after they have already incurred costs such as inspections and conveyancing fees.
In legal terms, gazumping is the act of a seller withdrawing from or changing a proposed property sale before a binding contract exists, in order to accept a higher offer from another buyer. Under Australian contract law, a sale of land is not enforceable until contracts are exchanged, meaning no legal obligation arises from verbal acceptance or informal agreement.
Because no contract exists at this stage, the seller is legally entitled to renegotiate or abandon the transaction without committing a breach of contract. Gazumping therefore occurs entirely within the pre-exchange period and is governed by the principle that only exchanged contracts create legally enforceable rights in property transactions.

A property sale becomes legally binding only when contracts are exchanged, not when an offer is accepted. Exchange involves both parties signing identical contracts and formally exchanging them, often accompanied by payment of the deposit.
Before exchange:
Gazumping occurs exclusively within this pre-exchange period.
Being gazumped means the buyer loses the opportunity to purchase the property because the seller accepts a higher offer before a legally binding contract is formed. Since contracts have not been exchanged, the transaction does not proceed and no enforceable rights arise for the buyer.
From a legal perspective, the buyer cannot compel the seller to complete the sale or claim breach of contract. In practical terms, this often results in lost pre-exchange costs, delays in securing another property, and exposure to changing market conditions.
Yes, gazumping is generally legal across Australia. Most states permit sellers to accept higher offers prior to exchange, provided there is no misleading or deceptive conduct.
However, legality does not mean absolute protection. In rare cases, gazumping may attract legal consequences where conduct involves:
Such claims are difficult to establish and depend heavily on evidence, which is why prevention is more effective than litigation.

Gazumping and gazundering arise from the same legal structure but affect opposite parties.
Gazumping
Gazundering
Both practices are legally permissible before exchange and illustrate the risks inherent in pre-contract negotiations.
Gazumping occurs because, under Australian property law, sellers are not legally bound to a sale until contracts are exchanged, allowing them to consider higher offers during negotiations. This legal structure gives sellers flexibility to respond to changing market conditions before a binding agreement is formed.
In practice, gazumping is more likely in markets with strong demand, rising prices, and multiple interested buyers. Delays in contract preparation, finance approval, or exchange create a window in which competing offers can emerge, incentivising sellers to maximise price before legal commitment occurs.
Yes, gazumping is more common in competitive housing markets where buyer demand exceeds available supply and property prices are rising quickly. In these conditions, sellers are more likely to entertain higher offers before exchange because they remain legally free to do so.
From a legal and market perspective, gazumping tends to occur when multiple buyers are interested in the same property and there is a delay between offer acceptance and contract exchange. The longer this pre-exchange period lasts, the greater the opportunity for competing offers to emerge.

Australian law offers limited direct protection against gazumping. The primary safeguard is reducing the time between offer acceptance and contract exchange.
Common protective strategies include:
These measures reduce opportunity rather than create legal rights, which is why many buyers choose to find a property lawyer early to manage timing and legal risk effectively.
While gazumping may be lawful, it is widely regarded as ethically questionable within the property industry. Sellers who gazump may undermine trust and strain relationships with agents and buyers.
Many real estate professionals encourage early exchange to promote transactional certainty and reduce disputes.
A home buyer can reduce the risk of being gazumped by minimising the time between offer acceptance and exchange of contracts. Because gazumping can only occur before a sale becomes legally binding, shortening this pre-exchange period is the most effective protection.
In practical terms, this involves engaging a conveyancer early, reviewing the contract before making an offer, securing finance pre-approval, and requesting prompt exchange once terms are agreed. These steps reduce the seller’s opportunity to consider competing offers and move the transaction into a legally enforceable position as quickly as possible.

The following questions reflect common legal concerns raised by buyers.
Gazumping is the practice of a seller accepting a higher offer from another buyer after initially agreeing to sell to someone else, but before contracts are exchanged. It occurs because no binding contract exists pre-exchange.
Gazundering occurs when a buyer reduces their offer late in negotiations, often just before exchange, placing pressure on the seller to accept a lower price.
Gazumping is generally legal in Australia. For buyers, the main consequence is losing the property and any pre-exchange costs incurred, with limited legal recourse.
Being gazumped means the buyer does not acquire the property and cannot compel the seller to proceed, as no legally binding contract exists.
High demand, rising prices, delayed exchange, multiple interested buyers, and extended negotiations all increase the likelihood of gazumping.
What is gazumping ultimately comes down to legal timing. Until contracts are exchanged, property transactions remain legally incomplete, leaving buyers exposed to competing offers.
Understanding this legal framework allows buyers to act strategically, reduce risk, and prioritise early exchange. For buyers seeking clarity, protection, and experienced legal guidance, LegalFinda connects individuals with Australian property lawyers and conveyancers who understand both the law and the realities of competitive property markets.

The LegalFinda Editorial Team is composed of qualified Australian solicitors, legal researchers, and content editors with experience across family, property, criminal, and employment law.
The team’s mission is to translate complex legislation into clear, reliable guidance that helps everyday Australians understand their legal rights and connect with the right lawyer.