What is Gazumping, and How to Protect Yourself

What Gazumping Means

Gazumping occurs when a seller, having verbally accepted your offer to buy their property, subsequently accepts a higher offer from a different buyer. In England and Wales, no binding contract exists until exchange of contracts, so a seller is under no legal obligation to proceed with you until that point, regardless of what they have verbally agreed.

It is frustrating, disruptive, and costly. And it is entirely legal.

Why Gazumping Happens

Gazumping is most common in seller's markets, when demand exceeds supply and prices are rising. A seller approached weeks after accepting your offer by a buyer willing to pay more has a financial incentive to switch. Estate agents are legally obliged to pass on all offers to the seller, even after an offer has been accepted.

The Cost of Being Gazumped

If you are gazumped before exchange, you typically lose:

• Solicitor fees for work completed to date (often £500–£1,500)
• Survey costs (£400–£1,500)
• Any mortgage arrangement fees already paid
• Weeks or months of time

Some buyers take out home buyers protection insurance, a policy that reimburses survey and solicitor costs if the sale falls through. Premiums are typically between £50 and £100.

How to Reduce the Risk

Move quickly

The longer the gap between offer acceptance and exchange, the greater the window for gazumping. Instruct a solicitor immediately. Have your mortgage in principle before making an offer. Respond to solicitor requests within hours, not days.

Request the property be taken off the market

When your offer is accepted, ask the seller to withdraw the property from portals and stop viewings. Most sellers will agree. While not legally binding, it significantly reduces the chance of a competing offer.

Consider a lock-out agreement

A lock-out agreement (exclusivity agreement) is a short-term contract in which the seller agrees not to negotiate with any other buyer for a fixed period, typically 28 to 56 days. Unlike the sale contract, a lock-out agreement is binding from signing. Your solicitor can draft one.

Use Property Passport UK to accelerate due diligence

One of the most effective ways to reduce gazumping risk is to get to exchange faster. Property Passport UK gives buyers access to verified property documents and data early in the process, helping your solicitor raise fewer enquiries and complete due diligence more quickly.

What About Gazundering?

The reverse, gazundering, occurs when a buyer reduces their offer at the last minute before exchange, knowing the seller is unlikely to restart the process. It is equally legal and equally frustrating.

Both practices are symptoms of the same structural weakness: the absence of any binding commitment before exchange. Until systemic reform arrives, buyers must rely on speed, relationship-building, and protective measures.