'My Buyers Dropped Their Offer by £15,000 the Day Before Exchange': Gazundering and How to Avoid It

For Sarah, selling her three-bedroom terraced house to fund the purchase of her parents' four-bedroom country home, the call came the day before contracts were due to be exchanged: her buyers wanted £15,000 off the agreed price, take it or leave it.

What actually happened to her

"It was awful, your heart just drops to your stomach," Sarah said of the moment she learned her buyers had gazundered her, industry shorthand for a buyer lowering their offer at the last possible moment, when a seller has the least room to walk away without losing the sale entirely. Rather than accept the reduced price, Sarah relisted her house that same day. The gamble worked: the following day, her original buyers returned to the estate agent's office and agreed to proceed at the price they'd first agreed to.

Why gazundering is legal, and why that matters

Gazundering is entirely legal in England, Wales and Northern Ireland, because under the law in those nations, a property sale only becomes binding at the point of exchange, not at the point an offer is accepted. Right up until that moment, either party can walk away or renegotiate with no legal consequence. That legal reality is precisely what makes gazundering such an effective, if widely resented, tactic: a buyer who waits until the seller is deepest into the process, often having already given notice, arranged their own onward purchase, or turned down other offers, holds maximum leverage at exactly the moment the seller has the least.

The scale of the problem

This isn't a rare, isolated tactic. Industry surveys suggest around a quarter of sellers have experienced gazundering in the past twelve months, and roughly a third of those price reductions land in the final two weeks before exchange, precisely the window of maximum pressure Sarah found herself in. Housing sales in general are notoriously fragile even without gazundering added to the mix: one in three house sales falls through entirely before exchange, and the average sale takes around 120 days to complete from offer acceptance, a long enough window for a buyer's circumstances, or intentions, to shift.

What it costs, in real money

The financial toll isn't limited to individual sellers absorbing five-figure last-minute cuts. Gazundering and the broader instability around exchange are estimated to cost sellers roughly £400 million a year collectively, and the wider economy an estimated £1.5 billion annually, when accounting for collapsed chains, wasted conveyancing costs and delayed transactions rippling outward from each individual case.

What's being done about it

Sarah's own frustration extended beyond her personal experience to a broader complaint: "nothing's been done about it is ridiculous." That's not entirely accurate going forward, government reforms currently planned aim to save first-time buyers roughly £650 in transaction costs and cut around four weeks off the typical completion timeline, changes intended to reduce the long window during which gazundering pressure can build. Whether faster completions meaningfully reduce gazundering itself, as opposed to simply shortening how long sellers are exposed to the risk, remains to be seen.

How sellers can actually protect themselves

The Conveyancing Association has laid out concrete steps sellers can take rather than simply hoping to avoid Sarah's experience. Communicating financial boundaries clearly to estate agents from the outset helps set expectations before a buyer even considers a late renegotiation. Completing Land Registry documents and searches early removes some of the procedural delay that creates the long vulnerable window in the first place. Sellers can also consider reservation agreements that carry financial penalties for a buyer who backs out or renegotiates without cause, and conditional binding offers tied to specific, disclosed requirements, both of which raise the cost to a buyer of trying the same tactic Sarah faced.

For Sarah, relisting the same day her buyers tried to cut £15,000 off the price turned out to be the right call, her buyers blinked first. But that outcome depended on her being willing and able to walk away entirely, a position not every seller navigating a chain and a tight moving timeline can actually afford to take.