Completion day is the moving date already agreed by the parties and inserted into the legally binding contract at exchange of contracts. The buyer’s solicitor will pay the seller’s solicitor the purchase price, less any deposit already paid at exchange of contracts. In return, the seller must vacate the property and hand the keys to the buyer (usually via their estate agents). The seller’s solicitor will send the buyer’s solicitor the transfer deed to enable the buyer’s lawyer to register the buyer’s title to the property at the Land Registry.