Simultaneous exchange and completion: When does it work?
When you are buying a property, exchange of contracts and completion usually happen on different days. In some cases, they can take place on the same day. This is known as simultaneous exchange and completion, often referred to as SIM. Understanding when this works well, and when it does not, can help you decide whether it is right for your purchase.
What is a SIM?
A SIM means exchange of contracts and the legal completion happens on the same day. There is no gap between committing to the purchase and getting the keys.
In a more traditional transaction, exchange happens first, and completion follows later, usually after a short gap.
When can it help?
A SIM can work well when parties want certainty and speed for straightforward transactions. This may include:
Transactions where there is no chain
Cash purchases.
Things to watch out for
While a SIM can offer speed and certainty, it also comes with risk:
Mortgage lenders require notice before completion, making SIM harder for financed purchases.
Logistics of moving on the same day can be demanding and stressful
All legal and practical steps must be ready at the same time, leaving little room if problems arise on the day
If one party cannot complete on the day, the entire transaction fails.
SIMS are generally impractical where there is a chain. Coordinating parties usually needs a period between exchange and completion
What this means for you
Simultaneous exchange and completion can be helpful in the right circumstances, but it requires careful planning and clear communication. It is not suitable for every transaction and should be considered on a case-by-case basis.
Next steps
If you are considering a SIM, taking advice early can help you assess whether it is realistic and ensure everything is in place to proceed smoothly. Our residential conveyancing team can guide you through your options and help you plan with confidence.