What’s the difference between exchange of contracts and completion?
If you’re partway through buying or selling a property, understanding the difference between exchange of contracts and completion matters — you’ve probably heard your solicitor mention “exchange” and “completion” as though they’re interchangeable, but they’re not, and each stage carries very different legal consequences.
Here’s what actually happens at each point, and what you need to have ready.
The difference between exchange of contracts and completion
Exchange of contracts is the moment the sale becomes legally binding. Once contracts are exchanged, neither party can walk away without serious financial consequences.
Completion is the day the sale actually happens — the money moves, ownership transfers, and you get the keys.
They’re not the same event, and they’re rarely on the same day.
What happens at exchange of contracts
Exchange is when your conveyancer and the other side’s conveyancer formally swap signed contracts — traditionally read over to each other on a recorded call to make sure both copies match, then confirmed and posted.
You won’t need to be present for the call itself, but before it happens you’ll typically need to:
- Confirm to your solicitor that you’re ready and happy to proceed
- Have your deposit (usually 5–10% of the purchase price) ready to send
- Agree a completion date with everyone else in the chain
Once contracts are exchanged:
- The sale is legally binding on both sides
- The completion date is fixed in the contract
- Pulling out afterwards means real financial risk — as a buyer, that typically means losing your deposit
Before you get to this point, it’s worth checking that your searches and survey are back, your mortgage offer is in writing, and you know exactly what’s included in the sale (fixtures and fittings should be confirmed in writing, not left to assumption).
Concerned about what happens if you need to pull out after exchange? It’s worth talking this through with your conveyancer before you commit — the penalties can be significant, and there’s usually very little room to negotiate once contracts are exchanged.
What happens at completion
Completion is the day ownership actually changes hands. On this day:
- The remaining purchase money (including any mortgage funds) is transferred to the seller’s solicitor
- Your solicitor registers the change of ownership with the Land Registry
- If the property is leasehold, the freeholder is notified of the new owner
- You collect the keys — the property must be vacant and available to you, usually by 1pm
If you’re both selling and buying, completion is also moving day at both ends.
How long between exchange and completion?
There’s no fixed rule, but one to two weeks is typical. It can be much shorter — even the same day, known as simultaneous exchange and completion — for a straightforward, chain-free purchase. Longer chains often need three to four weeks to give everyone time to organise removals, utilities and final checks.
Same-day exchange and completion carries more risk, since there’s no buffer between the sale becoming binding and the money actually moving — which is one reason it’s more common in chain-free transactions than in longer chains.
What happens in between
The period between exchange and completion isn’t dead time. Your conveyancer will typically be:
- Carrying out final pre-completion checks (confirming the property’s condition hasn’t changed, and that your finances haven’t either)
- Preparing the completion statement and finalising the mortgage funds with your lender
- Liaising with the freeholder if the property is leasehold
- Arranging for buildings insurance to be in place from the point of exchange, not completion
This is also your window to sort removals, transfer utilities, and set up home insurance if you haven’t already.
Getting the timeline right matters
Understanding the difference between exchange of contracts and completion isn’t just useful background — it shapes how you plan the whole run-up to moving day. Because exchange locks you into a fixed completion date, the period beforehand is when problems — a missing search result, a mortgage offer that hasn’t landed, a chain that isn’t quite aligned — need to be resolved. Once you’ve exchanged, there’s very little flexibility left.
Looking for a quick conveyancing process?
Whether you’re waiting on your chain to align, checking your finances are in order, or simply want a clear answer on where things stand, our Manchester team is on hand to help. We’ll give you a clear, fixed-fee quote and a dedicated solicitor who acts for you and nobody else, with no conveyancing conflict of interest to worry about.
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