The moment itself is strangely invisible: you attend nothing and sign nothing on the day. The conveyancers, holding identical signed contracts and your deposit, complete a formal telephone ritual — and somewhere in an ordinary phone call, the purchase becomes legally binding. Understanding the choreography makes the invisible day less nerve-racking.
What actually happens
Exchanges follow a Law Society formula: the conveyancers confirm by phone that they hold identical signed contracts and the deposit, agree the completion date, and declare contracts exchanged, recording the exact time. In a chain, this happens sequentially up the line in one coordinated session — which is why exchange days involve hours of silence and then everything at once. You will get a call or email: 'we have exchanged'.
What becomes fixed
From that moment: the price, the property, the parties and the completion date are contractual. The seller cannot accept another offer; you cannot walk away without forfeiting the exchange deposit and risking further claims. Your insurance is on risk, your completion date is real, and every provisional booking can become firm.
Between exchange and completion
The gap is admin, not risk: your conveyancer requests the mortgage funds for the day before completion, prepares the completion statement (the precise final money in and out), and you execute the logistics sprint of the next step. If disaster genuinely strikes in the gap — rare — the contract governs everything; but for practical purposes, from exchange you are buying the house.
Scenario: an exchange day, hour by hour
A three-link chain — first-time buyer, mid-chain family, top-of-chain empty house — planned to exchange on Thursday with completion the following Friday.
9:15, the buyer's conveyancer confirms deposit and signed contract in hand. 10:30, the mid-chain sellers' conveyancer reports their onward purchase's paperwork arrived late — an hour of recheck. 12:40, the top of the chain confirms. 13:05–13:25, the formula calls run bottom-to-top; each conveyancer releases the one below only when secured above. 13:30, the buyer gets the call: exchanged, completion fixed.
Outcome: By 14:00 the buyer had confirmed removals, served tenancy notice and told her employer — all things she had correctly refused to do for weeks. Nothing about the morning's delays was unusual; chains wobble on exchange day and still land. The lesson: keep the day free, keep your phone on, and sign nothing away before the call.
Your action list
Practical tips
- Celebrate at exchange, not completion — this was the real finish line of uncertainty; completion is logistics.
- Ask your conveyancer for the completion statement early and read every line; queries are easier before completion morning.
What can go wrong
- A 'we expect to exchange today' morning message is not exchange; chains sometimes miss the day. Act only on confirmation.
- Defaulting after exchange costs your deposit at minimum — if anything material changes for you (job, funds), call your conveyancer before the exchange call happens.
- PropertySquares provides education, not financial or legal advice. Verify current rules and obtain advice for your circumstances before acting.