Key facts: Gazumping — the seller accepting a higher offer after accepting yours — is legal in England and Wales because nothing binds either side until exchange of contracts. Scotland's system (concluded missives) makes it rare there. The best defences are speed to exchange, taking the property off the market in writing, and being a demonstrably ready buyer.
Why gazumping is possible
Between offer-accepted and exchange sit weeks of surveys, searches and conveyancing — commonly 8–12 of them. Until exchange, the seller can accept a better offer and owes you nothing, even for the survey and legal fees you've already spent. It intensifies in rising markets and on stand-out properties, and a variant — gazundering, where the buyer drops their offer late — appears in falling ones.
What actually reduces the risk
Move fast. The shorter the gap to exchange, the smaller the window. Have your mortgage in principle, conveyancer instructed, and documents ready on day one; book the survey immediately.
Get the listing pulled. Make removal from the market — portal listings included — a written condition of your offer. Agents generally honour it, and it stops casual rival offers at source.
Be the safer buyer. Sellers gazump less when the bird in hand looks certain: chain-free, financing evidenced, responsive. Certainty is currency — sometimes literally worth more to a seller than a slightly higher rival offer.
Lock-in agreements (exclusivity contracts) exist but are rare in ordinary purchases; a fast, committed transaction usually achieves the same effect without the legal overhead.
If you are gazumped
You can raise your offer, re-selling your certainty alongside it; walk away; or occasionally win anyway at the lower price when the rival buyer proves slow or fragile — worth asking the agent to keep you in reserve. What limits the damage is timing your spend: commission the survey promptly (it shortens the window) but delay big discretionary costs until the transaction shows momentum.
Speed is the strategy
Almost every anti-gazumping measure reduces to being exchange-ready faster than the average buyer. A broker who lines up your lender before you offer is a structural advantage. Get matched with a mortgage broker through Nesto — free, no obligation.
Frequently asked questions
Is gazumping illegal?
Not in England and Wales — until exchange of contracts, the seller can accept any offer. Scotland's earlier binding missives make it rare there.
Can I recover my costs if I'm gazumped?
Generally no — survey and legal fees are spent at your risk until exchange.
Does taking the property off the market stop gazumping?
It greatly reduces it by stopping new interest, though a determined rival can still approach the seller directly.
What is gazundering?
The reverse tactic: a buyer lowering their offer just before exchange, when the seller is most committed. Also legal, equally unpopular.