You have agreed a price, shaken hands (metaphorically, at least) and started picturing the removal van. Then the phone rings and the deal has changed. It is one of the most frustrating moments in a UK house sale, and it is perfectly legal in England and Wales. With sales taking longer and buyers feeling more cautious this autumn, it is worth knowing how it happens and what you can do about it.
Two terms, one root cause
The root cause is simple: in England and Wales, a property sale is not legally binding until contracts are exchanged. Until then, an agreed price is a gentleman's agreement and nothing more. Two things can follow.
- Gazumping: the seller accepts your offer, then accepts a higher one from someone else, or asks you to match it. Our explainer on what gazumping is covers the basics.
- Gazundering: the buyer lowers their offer late in the process, often just before exchange, hoping the seller will accept rather than start again. There is more in our guide to gazundering.
Neither is a crime, and neither is as common as the horror stories suggest. But both can cost real money, especially for a buyer who has already paid for a survey and legal work.
Which one is more likely right now?
Gazumping tends to rise when demand outstrips supply and buyers are competing. Gazundering tends to rise when the market softens and buyers have the upper hand. With prices broadly flat and sales taking longer, as we explored in why house sales are taking longer, gazundering is the one sellers should keep an eye on. A buyer who finds a damp patch in the survey, or spots a similar home listed for less, may feel emboldened to renegotiate.
That is not always bad faith. Sometimes a survey genuinely reveals a problem, or a valuation comes in below the agreed price. The difference is between a reasoned renegotiation based on new facts and a last-minute squeeze.
A note on Scotland
This article covers England and Wales. In Scotland, the offer process is different and an accepted offer becomes legally binding much earlier, so gazumping is rare there.
If you are selling: how to protect the deal
1. Qualify your buyer properly
Ask for proof of funds or a mortgage in principle before you accept an offer. A buyer with their finances lined up and a solicitor instructed is less likely to wobble.
2. Get your paperwork ready early
Delays give everyone time to reconsider. Instruct your solicitor as soon as you list, gather your title documents, and complete the property information forms promptly. A faster sale is a safer sale.
3. Be upfront about known issues
If you know about a leak, a boundary dispute or an out-of-date certificate, say so early. Problems discovered late are the most common trigger for a price drop. Our guide to the sellers' disclosure explains what you need to share.
4. Keep the property live if you need to
It is perfectly reasonable to keep taking viewings while an offer is pending, as long as you are honest with everyone. A serious backup buyer keeps the pressure on your first buyer to stay on track and gives you a fallback if they pull out.
5. Aim to exchange quickly
Once everything is in order, push to exchange. Ask your solicitor what is holding things up each week. Our conveyancing step-by-step guide shows where the typical delays happen.
If you are buying: how to protect yourself
1. Show you are serious
Make your offer with a decision in principle or mortgage agreement behind it, tell the agent you are ready to instruct a solicitor, and be flexible on timing where you can. Sellers favour certainty over a slightly higher number.
2. Ask about a reservation agreement
Some sellers and agents will agree a reservation or lock-out agreement, where you pay a fee and the seller agrees to take the property off the market for an agreed period. Terms vary, and the fee may not be refundable, so ask your solicitor to read it before you sign.
3. Limit your spending until it is safer
Surveys, searches and legal fees can add up quickly, and you will not get them back if the deal collapses. Some buyers wait for the mortgage offer before ordering the most expensive items. Talk to your solicitor about sensible sequencing. A property survey is still worth having, but timing is your call.
4. Renegotiate on evidence, not impulse
If you want to reduce your offer, base it on something concrete: survey findings, repair quotes or a down-valuation. Put it politely and in writing. Sellers respond far better to a reasoned case than a last-minute ultimatum, and you keep your reputation intact.
5. Keep a close eye on the clock
Chase your solicitor, the lender and the other side weekly. The sooner you reach exchange of contracts, the sooner both parties are legally committed.
What exchange of contracts actually changes
At exchange, both sides sign identical contracts, the buyer pays the deposit (usually 10% of the price, though this can be negotiated) and a completion date is fixed. From that moment, pulling out has serious consequences. A buyer risks losing their deposit and being sued, and a seller can be liable for the buyer's costs. That is why the period before exchange is the vulnerable one, and why speed and preparation matter.
Common mistakes to avoid
- Taking the property off the market too early: without a signed agreement, a verbal yes protects no one.
- Spending heavily before the mortgage offer: it is hard to recover costs from a collapsed chain.
- Going quiet: silence breeds doubt. Regular, polite updates keep everyone engaged.
- Ignoring the chain: your sale may depend on others. Ask where everyone in the chain stands.
Want a smoother sale?
Selling is calmer when you have a clear process and someone in your corner. With Moovehub, you can sell your home for a flat fee, with support from listing through to completion. If you are a landlord planning to sell up, or looking for a new tenant first, our tenant find service and fully managed service can keep the rent coming in while you decide.
This article is general guidance, not legal advice. Speak to a qualified conveyancer about your own sale or purchase.
