Exchange of contracts is the point at which buying a house becomes legally binding: signed contracts are swapped and you pay your deposit. Completion is the day the remaining money is transferred, you legally transfer ownership, and you collect the keys. Before exchange, either party can walk away without penalty; after exchange, pulling out means losing your deposit.
If you’re buying a house for the first time, you’ll quickly discover the home buying process comes with its own language and the two terms you’ll hear most are exchange of contracts and completion. They’re often mentioned in the same breath, but they mean very different things, and knowing the difference tells you exactly when you’re committed, when the property becomes yours, and what could still go wrong along the way.
What does exchange of contracts mean?
Exchange of contracts is the moment a property purchase in England and Wales becomes legally binding. Both solicitors swap signed, identical contracts and the buyer pays a deposit, typically 10% of the purchase price.
Until exchange, either side can withdraw without penalty, which is why buyers can be gazumped right up to this point. Once contracts are exchanged, a completion date is fixed so you’re legally committed, and buildings insurance usually becomes your responsibility from that day. With new build properties, however, completion will only take place once the property has been built, so the exact date may not be fixed at exchange.
Can I pull out after exchange?
Not without serious consequences. Once contracts are exchanged, the sale is legally binding. A buyer who fails to complete will usually risk losing their deposit and may be liable for the seller’s losses and other costs. Similarly, a seller who fails to complete can be liable to the buyer for breach of contract, including costs and potentially compensation. In practical terms, exchange is the point at which you are legally committed to the transaction.
What happens on completion day?
Completion is the day the purchase legally completes, and ownership of the property passes to you. Your solicitor sends the remaining purchase money to the seller’s solicitor, including the mortgage funds and the balance of your deposit. Once the seller’s solicitor confirms that the money has arrived, completion takes place and the keys can be released, usually through the estate agent. Your solicitor then deals with the post-completion formalities, including registering your ownership with HM Land Registry and paying any Stamp Duty Land Tax due.
Exchange vs completion: key differences
| Key Factor | Exchange of contracts | Completion |
|---|---|---|
| What happens | Contracts are swapped and the deposit is paid | Balance is paid and ownership transfers |
| Legal status | Sale becomes legally binding | You become the legal owner |
| Can you pull out? | Only by losing your deposit | No |
| Keys? | No | Yes |
| Insurance | Passes to the buyer | Buyer fully responsible |
How long exchange and completion take place?
Most buyers complete between one and two weeks after exchange, although the exact date is agreed between the buyer and seller. There is no legal minimum period: exchange and completion can happen on the same day, particularly where there is no chain. Equally, the parties can agree a much longer period, including several months.
In a chain, exchange and completion dates are usually coordinated across the chain so that everyone can move on the same day. A delay affecting one transaction can therefore have a knock-on effect on the others.
Before exchanging, your solicitor will normally need to have completed the necessary legal work and be satisfied that you are ready to commit to the purchase. Your mortgage arrangements, searches, survey and the seller’s replies to enquiries will generally have been dealt with by this stage. From accepting an offer to exchange typically takes around 8–12 weeks, although this can be considerably shorter or longer depending on the transaction.
Quick tips for first-time buyers
- Don’t book removals until you’ve exchanged.
Before exchange, your completion date isn’t legally binding and could change.
- Have buildings insurance ready to start on exchange
This is generally the point at which the buyer becomes responsible for the property, although the contract should be checked because the position can vary.
- Avoid taking out new credit before completion
Your lender may re-check your financial circumstances before releasing the mortgage funds, so avoid major financial changes unless you’ve discussed them with your broker or lender.
- Stay responsive
Answer your solicitor’s questions and provide documents promptly. Delays in getting information or instructions can hold up the transaction.
What to remember
The key difference is simple: exchange is when you commit and completion is when the property becomes officially yours. Knowing what happens at each conveyancing stage helps you plan ahead and avoid costly surprises.
Finding your first home is exciting, but sorting out the legal side shouldn’t be stressful. Ready to get things moving? Simply get your quote today.
