"Sale agreed" feels like the finish line — but in England and Wales, it isn't binding on either side until exchange of contracts. That gap, which can run from a few weeks to a couple of months, is where surveys happen, mortgages are finalised, and a meaningful share of sales unravel entirely. Understanding what's actually happening in it is the difference between managing the risk and being caught out by it.
What "sale agreed" actually means
When a seller accepts an offer, both sides agree in principle to proceed at that price — but it's not a legal contract. Either party can still withdraw or renegotiate at this stage without penalty, which is exactly why the period between sale agreed and exchange needs active management, not just patience.
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Get a conveyancing quoteWhat happens during the gap — surveys, searches, mortgage offers
In the weeks after sale agreed, the buyer's solicitor raises searches and enquiries, a survey is typically carried out, and the buyer's mortgage lender issues a formal mortgage offer based on that survey. Any one of these can introduce a delay or a renegotiation — a survey flagging an issue, or a lender valuing the property below the agreed price, are both common causes of last-minute changes at this stage.
Why deals fall through during this stage
Because nothing is binding, this is also the point at which gazumping (a seller accepting a higher offer from someone else) or gazundering (a buyer reducing their offer shortly before exchange) can happen, though both are relatively uncommon when both sides are genuinely committed. More often, sales collapse for less dramatic reasons — a survey issue that can't be resolved, a mortgage offer that doesn't come through, or a chain breaking further along.
Nothing in a property sale is actually secure until exchange — which is exactly why the gap before it deserves more attention than it usually gets.
What exchange of contracts actually changes
At exchange, both parties sign identical contracts, a completion date is fixed, and the buyer pays a deposit — from this point, withdrawing without a very good reason carries real financial and legal consequences for whichever side pulls out. It's the moment a sale stops being an agreement in principle and becomes a binding commitment.
How to protect your sale during the gap
For sellers, staying in regular contact with your solicitor and buyer's agent, and responding to enquiries quickly, keeps momentum and reduces the window for something to go wrong. For buyers, getting a survey booked early and keeping mortgage paperwork moving are the two most effective things within your control. On both sides, a proactive agent chasing the chain — not just waiting for updates — is often what actually keeps a sale on track through this stage.
If you're navigating a sale through this stage, or preparing to sell, and want experienced guidance managing it to exchange and completion, start with a Selling Advice Meeting and Valuation.
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