Gazumping and gazundering exploit the same structural gap in English and Welsh property law: nothing is legally binding until contracts are formally exchanged. This guide separates what the June 2026 government reform proposals would actually change from what's genuinely law today, and covers the real, currently-available protections, including a legally binding agreement most buyers don't know exists.
Figures below reflect the government's June 2026 home buying and selling reform announcement and HomeOwners Alliance guidance, current to mid-2026. This is general information, not legal advice; a specific transaction should be discussed with your conveyancing solicitor.
1. Gazumping and gazundering, defined properly
Both practices exploit exactly the same structural weakness in the system: the gap between an offer being verbally accepted and contracts actually being exchanged, during which neither party is legally committed to anything.
2. Why both are currently completely legal
In England and Wales, a residential property sale isn't legally binding until contracts are formally exchanged, which typically happens weeks or months after an offer is first accepted. Until that point, either party can walk away, or change the price, entirely legally and at no financial cost, however many verbal agreements, emails, or handshakes have passed between them. This is fundamentally different from Scotland, where an accepted offer, once formalised into missives, becomes legally binding considerably earlier in the process, which is precisely why gazumping and gazundering are effectively prevented there.
3. The genuine cost of the current system
Government figures show that, once an offer is accepted, it currently takes an average of 120 days, just over 17 weeks, to reach completion, with roughly one in three sales falling through somewhere along the way. Failed transactions are estimated to cost consumers around £400 million a year in wasted survey, legal, and mortgage arrangement fees, and up to £1.5 billion a year to the wider economy.
4. The June 2026 reforms: what's actually proposed
In June 2026, the government announced a package of home buying and selling reforms aimed at tackling exactly this problem. The centrepiece is the proposed introduction of binding conditional contracts, which would make a transaction legally binding much earlier, likely at or shortly after an offer is accepted, rather than only at exchange. Under the proposals, withdrawing from a binding conditional contract without a valid reason could result in a financial penalty. Reasons expected to be treated as valid include major issues uncovered by a survey, the buyer being unable to secure a mortgage offer, and the collapse of the wider chain further along the transaction. The reforms also include mandatory digital sales packs, intended to make key property information available upfront rather than discovered gradually during conveyancing.
5. Why this isn't law yet, despite the headlines
Some headline coverage of the June 2026 announcement has framed it as "the end of gazumping," which genuinely overstates where things currently stand. As of mid-2026, no legislation has actually been passed to make offers legally binding earlier in the process. Housing reform of this scale requires legislation, consultation, and significant changes to conveyancing systems, estate agency processes, and lender workflows, all of which take time to align. If you agree a purchase price now, you're very likely still operating under the current rules, not the reformed ones, until the new legal framework is confirmed and actually in force.
6. Real protections available right now
- A lock-out (exclusivity) agreement is a short-term, genuinely legally binding contract, typically lasting around 28 days, in which the seller agrees not to negotiate with any other buyer for that period. It doesn't guarantee completion, but it does prevent a rival offer being accepted during its term, and is available and enforceable under current law, not a proposed future reform.
- Securing a mortgage agreement in principle early demonstrates you're a serious, ready buyer and helps you move to exchange faster, reducing the window of vulnerability.
- Homebuyers Protection Insurance can cover conveyancing, survey, and mortgage arrangement costs already spent if a purchase falls through for reasons outside your control.
- Moving quickly toward exchange remains the single most effective practical protection under the current system, since the entire risk exists only in the gap before contracts are exchanged.
7. Frequently asked questions
Is gazumping actually illegal in the UK now?
No. As of mid-2026, gazumping remains completely legal in England and Wales. The government announced a package of reforms in June 2026 aimed at eventually ending the practice through binding conditional contracts, but this is a policy announcement, not enacted legislation, and headlines describing "the end of gazumping" refer to the launch of the reform process rather than an immediate legal change.
What is a binding conditional contract, and is it law yet?
A binding conditional contract, as proposed in the government's June 2026 reforms, would make a property transaction legally binding much earlier, likely at or shortly after an offer is accepted, with financial penalties for withdrawing without a valid reason. As of mid-2026, this remains a proposal requiring further legislation, consultation, and changes to conveyancing and lender systems before it takes effect, so it is not currently in force.
What is a lock-out agreement and does it stop gazumping now?
A lock-out agreement, also called an exclusivity agreement, is a short-term legally binding contract, typically lasting around 28 days, in which the seller agrees not to negotiate with any other buyer during that period. It is available and enforceable under current law, and while it doesn't guarantee the sale will complete, it genuinely does prevent the seller from accepting a rival offer for its duration.
What would count as a valid reason to withdraw under the proposed binding contract reforms?
Under the government's proposals, valid reasons expected to be protected from penalty include major issues uncovered by a survey, the buyer being unable to secure a mortgage offer, and the collapse of the wider chain further along the transaction. Full detail on how these exceptions would work in practice is still to be set out in future legislation.
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