What is exchange of contracts, and when does it happen?
Published 3 June 2026 · 5 min read · By Evren Ergin
Exchange of contracts is the moment a property sale in England and Wales becomes legally binding. Until contracts are exchanged either side can walk away without a legal penalty, and once they are exchanged both the buyer and the seller are committed to completing on the agreed date.
TL;DR
- •Exchange of contracts is the point where signed contracts are swapped between the buyer's and the seller's solicitors and the sale becomes legally binding.
- •On exchange the buyer pays a deposit, usually around 10% of the price, held by the seller's solicitor until completion.
- •Completion, when ownership transfers and the keys change hands, usually follows one to two weeks later, though it can be the same day.
- •Before exchange nothing is guaranteed, which is why around 1 in 4 agreed UK sales fall through, almost always at this earlier stage.
Exchange of contracts is the single most important moment in a house sale, and it is also one of the least understood. Everything before it is provisional. Everything after it is committed. This guide explains what happens at exchange, how it differs from completion, and why it matters so much for both sellers and buyers.
What actually happens at exchange of contracts?
Both sides sign identical copies of the contract in advance. Their solicitors then check that the two contracts match, agree a completion date, and formally exchange them, usually over a recorded telephone call. At that moment the agreement becomes legally binding and the buyer transfers the deposit.
How much deposit do you pay on exchange?
The deposit is usually around 10% of the purchase price, although it can sometimes be negotiated lower, such as 5%. It is paid on the day of exchange and held by the seller's solicitor as stakeholder until completion, when it counts toward the full price the buyer pays.
What is the difference between exchange and completion?
Completion is the day ownership actually transfers from seller to buyer and the keys change hands. If exchange makes the sale binding, completion is the day it physically happens.
Exchange vs completion
| Stage | What it means | What changes hands |
|---|---|---|
| Exchange of contracts | The sale becomes legally binding | The deposit, usually around 10% |
| Completion | Ownership transfers to the buyer | The balance of the price, and the keys |
The gap between the two is most commonly one to two weeks, though it can range from the same day to around four weeks, depending on what the buyer and seller agree. The gap gives everyone time to arrange removals knowing the move is now certain.
Can you pull out after exchanging contracts?
Not without serious cost. After exchange the contract is binding on both sides. A buyer who pulls out usually forfeits the whole deposit and can be liable for further losses. A seller who pulls out can be sued by the buyer or, in some cases, forced to complete. This is the point of no easy return.
Why does exchange matter so much for sellers and buyers?
Because everything before it is provisional. Gazumping, cold feet, mortgage declines, and collapsed chains all happen before exchange, which is why around 1 in 4 agreed UK sales fell through in early 2026, almost all of them pre-exchange. Reaching exchange is the moment a sale stops being a hope and becomes a certainty.
How long after exchange is completion?
Most commonly one to two weeks, although it can be anything from the same day to about four weeks. The completion date is agreed between the parties and fixed at the point of exchange.
Is exchange of contracts the same as completion?
No. Exchange is when the sale becomes legally binding. Completion is the later day when ownership transfers, the balance of the money is paid, and the keys are handed over.
What happens if you miss the completion date after exchange?
You can be charged interest and penalties set out in the contract. In serious cases the sale can be rescinded, with the buyer forfeiting their deposit, so missing completion is treated as a breach of contract.
Do you need to be present to exchange contracts?
No. Your solicitor exchanges on your behalf, usually over the phone. You simply need to have signed your copy of the contract in advance.
ValuQ is a UK platform that gives homeowners free, side-by-side property valuations from competing local estate agents, so sellers begin the journey toward exchange in control of the timeline and the choice of agent.
Sources
- [1]Howells Solicitors: the difference between exchanging contracts and completion · 2026-01-01 · https://www.howellslegal.co.uk/news/the-difference-between-exchanging-contracts-and-completion-when-buying-or-selling-a-residential-property-in-the-uk/
- [2]Homeward Legal: exchange vs completion, what's the difference · 2026-01-01 · https://www.homewardlegal.co.uk/guides-advice/post/difference-between-exchange-of-contracts-and-completion
- [3]Zoopla: the difference between exchange and completion · 2026-01-01 · https://www.zoopla.co.uk/discover/buying/whats-the-difference-between-exchange-and-completion-when-buying-a-home/
- [4]ABC Money: 24% of UK property sales fall through in early 2026 (Quick Move Now data) · 2026-05-13 · https://www.abcmoney.co.uk/2026/05/uk-housing-market-under-strain-as-24-of-property-sales-fall-through-in-early-2026
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