What are gazumping and gazundering, and can I protect myself?

Why an accepted offer means nothing in England, Wales and Northern Ireland until exchange, what a seller and a buyer can each do at the last minute, and the handful of things that genuinely reduce the risk.

Difficulty: beginner
Time: 10 min
Read: 5 min

Short answer

Gazumping is a seller accepting a higher offer from someone else after already accepting yours; gazundering is a buyer cutting their offer just before exchange. Both are lawful in England, Wales and Northern Ireland because an accepted offer is not a contract until exchange. The only complete protection is reaching exchange quickly; the partial ones are a lock-out agreement, taking the property off the market, and having finance and a conveyancer ready before you offer.

This is a structural feature of the English system rather than bad behaviour by individuals. Between offer and exchange — commonly two to four months — either side is free to change their mind, and any money spent on searches, surveys and legal work is at risk throughout. Scotland avoids most of it by binding much earlier at conclusion of missives, which is why gazumping is rare there.

Step by step

Understand why it is possible at all.In England, Wales and Northern Ireland an accepted offer creates no obligation on either side. The agent must, by law, pass on any offer they receive to the seller until contracts are exchanged, so a later higher offer does reach the seller.
Reduce the window rather than trying to close it.Every week between acceptance and exchange is a week of exposure. A mortgage agreement in principle before you offer, a conveyancer instructed the same day, searches ordered immediately and enquiries answered within days are worth far more than any agreement you can sign.
Ask the agent to take it off the market.Ask for the listing to be marked sold subject to contract and viewings stopped. The agent still has to pass on offers that arrive, but reducing the flow of new interest reduces the chance. Get the agreement in writing from the seller, not just the agent.
Consider a lock-out agreement.A short contract in which the seller agrees not to negotiate with anyone else for a fixed period, usually in exchange for a small payment. It cannot force the seller to sell to you, but it can make breaking off negotiations cost them something. Your conveyancer draws it up.
Understand reservation agreements.A more recent variant in which both sides commit a deposit that is forfeited by whoever withdraws. They are used on some new-build sales and are being trialled more widely. Read what triggers forfeiture before signing — a survey result is not always an escape route.
Insure the abortive costs if the sums justify it.Home buyer protection policies cover some survey, search and legal costs if a purchase falls through for defined reasons. Check the exclusions carefully: they typically do not pay out if you are the one who withdraws.
Recognise gazundering from the seller's side.A buyer reducing their offer days before exchange, when the seller has committed to an onward purchase and removals. The defences are the same in reverse: move fast, keep your onward chain informed, and know your walk-away number before you are put on the spot.
Decide your ceiling before you are asked.If you are gazumped, you are being asked to make a large decision under time pressure with sunk costs pushing you. Deciding in advance what the property is worth to you is the only defence against that.
Know that reform is intended, and is not here yet.The government has published a home buying and selling reform programme for England, Wales and Northern Ireland covering seller-assembled sales packs and, later, binding conditional contracts with penalties for withdrawing without good reason. None of that changes the position today. Check GOV.UK for the current state before relying on it.

Tips

Ask the agent what makes a buyer attractive to this seller. Speed and certainty are often worth more than the last few thousand pounds.
If you are the seller, tell your buyer the exchange date you need and why. Most gazundering happens where a buyer thinks the seller has no alternative.
Keep a written record of what was agreed and when, including the offer acceptance email. It will not create a contract but it is useful in any complaint about an agent's conduct.

Common mistakes

Spending on a survey before the mortgage is properly progressed — The order matters. Getting the lender's position clear first means the money you spend on a survey is spent on a purchase that has a real chance of proceeding.
Relying on the agent's assurance that it is off the market — The agent acts for the seller and must pass on offers by law. Only the seller can agree not to negotiate with others, and only a lock-out agreement gives that any teeth.

If it doesn't work

The agent says another buyer has offered more

Cause: No contract exists yet, and the agent must pass offers on — Fix: Ask whether the other buyer is proceedable — chain-free, finance agreed, conveyancer instructed. Then decide against your pre-set ceiling rather than against the fear of losing the house.

Your buyer has dropped their offer a week before exchange

Cause: Gazundering, sometimes justified by a survey and sometimes not — Fix: Ask for the reason in writing and for any survey extract supporting it. Get your own quotes for anything genuine. Then weigh the reduction against the cost and delay of remarketing.

You keep losing properties before exchange

Cause: Your side is the slow one in the chain — Fix: Get an agreement in principle, instruct a conveyancer and pay for searches on day one, and answer enquiries within days. Sellers accept lower offers from buyers who move quickly, and speed is the one thing you control.

Questions people ask

Is gazumping illegal?

No. In England, Wales and Northern Ireland there is no contract until exchange, so a seller accepting a better offer is exercising a freedom they still have. Estate agents are separately obliged to pass on all offers they receive until exchange.

Can I get my survey and search costs back if I am gazumped?

Not from the seller. Those costs are spent and there is no contract to sue on. A home buyer protection policy bought at the outset is the only realistic way to recover some of them.

Does it happen in Scotland?

Rarely in the same form. Missives are usually concluded within weeks of an offer being accepted, and from that point both sides are contractually bound. Before missives conclude a Scottish seller can still accept another offer.

Should I pay more to stop a gazumper?

That is a personal judgement about value and about what else is available, and no guide can make it for you. What helps is having decided your maximum before the call comes, and knowing what you would lose in sunk costs by walking away.