What is the difference between exchange and completion?
These are the two decisive moments in an English or Welsh property purchase, and confusing them causes real problems.
Exchange of contracts is the point at which the deal becomes legally binding. Both parties' solicitors swap signed contracts and agree a completion date. Before exchange, either side can walk away for any reason with no liability. After exchange, they cannot — a buyer who pulls out forfeits their deposit, typically 10% of the purchase price, and can be sued for further losses.
At exchange the buyer pays that deposit, and — critically — the risk in the property passes to the buyer. This is why buildings insurance must be in place from exchange, not from completion. If the house burns down between the two dates, it is the buyer's problem.
Completion is when the money moves and ownership transfers. The buyer's solicitor sends the balance of funds, the seller's solicitor confirms receipt and releases the keys, and you can move in. The seller must vacate by an agreed time, commonly around midday.
The gap between them is usually one to four weeks, negotiated to suit both sides and everyone else in the chain. Same-day exchange and completion is possible and sometimes necessary, but it is risky — there is no window to fix a problem, and if funds do not arrive in time the transaction can fail on the day.
After completion the solicitor pays any Stamp Duty and registers the change of ownership at HM Land Registry, which can take months and does not affect your occupation.
Scotland differs. Missives conclude to create the binding contract, and the equivalent of completion is called the date of entry.
Do not book removals, give notice or arrange anything irreversible before exchange.