Exchange & Completion Explained

Exchange and completion are the two final milestones in the property buying process. They are distinct legal events, and understanding the difference between them is essential. Exchange of contracts is when the purchase becomes legally binding, while completion is when the money changes hands and you take ownership of the property. These can happen on the same day (known as a simultaneous exchange and completion) or with a gap between them, typically one to four weeks.

Before contracts can be exchanged, several things need to be in order. Your solicitor must have received satisfactory results from all property searches, resolved any outstanding enquiries with the seller's solicitor, and reviewed the final contract. You must have a formal mortgage offer in place, buildings insurance arranged to start on the date of exchange, and your deposit funds ready to transfer.

Your solicitor will send you a report on the title, summarising their findings from the searches and enquiries. Read this carefully and raise any questions before proceeding. You will also receive a completion statement detailing all the financial aspects of the transaction, including the purchase price, deposit, mortgage advance, solicitor's fees, disbursements, and stamp duty.

If you are in a chain (a sequence of linked transactions), all parties in the chain must be ready to exchange at the same time. This can be the most frustrating part of the process, as a delay by any one party holds up everyone. Your solicitor and estate agent will coordinate with the other parties to agree an exchange date.

Exchange of contracts is carried out by the solicitors, not by you directly. The two solicitors speak by phone and formally confirm the agreed terms of the contract. They each hold a signed copy of the contract, and once the terms are confirmed, the contracts are said to be "exchanged." The deposit is transferred from the buyer's solicitor to the seller's solicitor on the same day.

From the moment of exchange, the purchase is legally binding on both sides. If the buyer pulls out after exchange, they forfeit their deposit and may be sued for damages. If the seller pulls out, they must return the deposit and may also face a claim for damages. This legal commitment is what makes exchange such a significant milestone.

At exchange, a completion date is formally agreed and written into the contract. This is the date on which the remaining funds will be transferred and you will take possession of the property. In a chain, the completion date must work for all parties.

The period between exchange and completion is typically one to four weeks, though it can be shorter (even the same day) or longer by agreement. During this period, you should finalise your moving arrangements, including booking removal companies, arranging utility transfers, and setting up mail redirection through Royal Mail.

Your buildings insurance should already be in place from the date of exchange. This is critical because from exchange onwards, you have a legal interest in the property and would still be required to complete the purchase even if the property were damaged or destroyed. Your mortgage lender will typically require proof of buildings insurance before releasing the mortgage funds.

Your solicitor will request the mortgage funds from your lender a few days before completion. They will also prepare the transfer deed and any other documents needed for the Land Registry application. Ensure that any remaining funds you need to contribute (the difference between the mortgage advance, deposit, and total due) are in your solicitor's account in good time.

Completion day is the day you officially become the owner of your new home. Here is what happens, step by step:

Morning: Your solicitor transfers the remaining purchase funds (the mortgage advance plus your equity contribution minus the deposit already paid) to the seller's solicitor. The transfer is made via the banking system and typically arrives by mid-morning, though delays can occur, especially on busy days such as the last Friday of the month.

Confirmation: Once the seller's solicitor confirms receipt of the funds, completion has taken place. The seller's solicitor notifies the estate agent, who releases the keys to you. Your solicitor will call or email you to confirm that completion has happened and you can collect the keys.

Collecting keys: You collect the keys from the estate agent's office. In some cases, the seller may leave the keys at the property itself, but collecting from the agent is more common. Check that you have all sets of keys, including any for garages, sheds, or communal areas.

Moving in: Once you have the keys, the property is yours. Take meter readings for gas, electricity, and water as soon as you arrive. Photograph the readings for your records. Test the heating, hot water, and all appliances. Check that the property is in the condition agreed — the seller should have left it clean and removed all their belongings unless otherwise agreed.

After completion, your solicitor handles several important tasks. They will pay your Stamp Duty Land Tax (SDLT) to HMRC within 14 days and submit the Land Registry application to register you as the new owner. Land Registry processing can take several weeks or even months, but you are the legal owner from completion regardless.

You should take the following steps in the first few days after completion:

Notify the council: Register for council tax at your new address and cancel it at your old one. If you are eligible for any council tax discounts (such as the single person discount), apply for these at the same time.

Set up utilities: Contact gas, electricity, and water providers to register the accounts in your name and provide your opening meter readings.

Redirect mail: Set up a Royal Mail redirection from your old address. This costs a modest fee and ensures you do not miss any important correspondence during the transition.

Change your address: Update your address with your bank, employer, GP, dentist, DVLA (for your driving licence and vehicle registration), electoral roll, and any subscriptions or memberships.

Secure the property: Consider changing the locks, as you have no way of knowing how many copies of the keys exist. Check that all windows and doors lock properly and review the home security arrangements.

In some cases, exchange and completion happen on the same day. This is more common in chain-free transactions or where speed is essential. While it avoids the waiting period between exchange and completion, it also increases the risk — if something goes wrong on the day, you could be left without a home and without legal recourse.

Your solicitor and mortgage broker can advise whether a simultaneous exchange and completion is appropriate for your circumstances. If you do proceed on this basis, ensure your buildings insurance is arranged in advance and your removal company is booked provisionally, as you will not have absolute certainty until the contracts are exchanged on the morning of the same day.