What Are Exchange and Completion?  

Exchange and completion are the final finish line of the home-buying process. They transform your offer into a legal reality, moving you from buyer to homeowner. 

Exchange of contracts: the point of no return 

This is the moment the deal becomes legally binding. Most solicitors now use secure digital signature platforms to execute contracts instantly, though the exchange itself is still a formal legal swap handled between solicitors. 

You pay your exchange deposit, typically 10% of the purchase price. If you pull out after this point, you’ll lose your deposit and could be sued for breach of contract. 

On the day of exchange, the completion date is set in stone. The moment you exchange is also when you must have your buildings insurance policy active, as the legal risk of the property transfers to you. 

Completion day: moving day 

Completion is when the money moves and ownership transfers. It usually happens one to four weeks after exchange. 

Your solicitor releases the remaining balance (your mortgage funds plus the rest of your deposit). Once the seller’s solicitor confirms receipt of funds (usually by midday), they release the keys. The estate agent will then call you to collect them. 

After moving in, your solicitor pays any Stamp Duty (SDLT) due and registers you as the owner at the Land Registry. 

Watch the expiry date 

In a fluctuating interest rate market, your mortgage offer has a strict expiry date. If your completion date is pushed back by a chain delay and your offer expires, you may have to re-apply at a different rate. A proactive solicitor monitors this date to ensure you cross the finish line before your deal expires. 

The key differences 

At exchange, the deal becomes legally binding with heavy penalties for pulling out. You pay the exchange deposit (usually 10%), but you don’t get the keys yet. Your buildings insurance must be active. 

At completion, ownership officially transfers. You pay the remaining balance of the price and get the keys, usually by early afternoon. You then have 14 days to file and pay Stamp Duty. 

Simultaneous exchange and completion 

If you’re a first-time buyer with no chain and your mortgage is ready, you may be able to exchange and complete on the same day. While this is fast, it can be high-pressure as you don’t have a guaranteed moving date until the very last minute. Your solicitor will advise if this is a safe and strategic option for your specific move. 

For more on the steps leading up to exchange, see our guide on how do enquiries work. 

Next steps 

The final stages of a purchase are high-stakes. At Setfords, we combine cutting-edge digital security with proactive chasing. 

We coordinate with your lender to ensure funds arrive on time and work closely with the seller’s side to ensure there are no key release delays. We handle the 14-day Stamp Duty filing and Land Registry applications immediately after you move in, so you can focus on making your new house a home. 

Get your free conveyancing quote today 

What you can expect with Setfords

More time, more attention: With no targets, Setfords lawyers can dedicate more time to you.

Ultimate flexibility: Our lawyers can tailor their schedules to meet your needs.

Nationwide coverage: with hundreds of consultant lawyers across the UK, we’ll connect you with the right expert.

Dedicated specialist legal partner: work directly with your chosen lawyer from start to finish.

Highly experienced: Setfords lawyers have an average of 20 years’ experience, so you can be assured you’re in safe hands.

Capacity-based allocation: our lawyers never take on more work than they can handle, so you get the focus and attention you deserve.

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