Somewhere between a quarter and a third of agreed house sales in the UK never reach completion. That’s a lot of packed boxes, booked removal vans and school places that come to nothing. What most of those collapsed sales have in common is that the warning signs were there weeks before the call from the agent, and the seller either didn’t spot them or didn’t know what to do about them. If you’re mid-sale and something feels off, here are the five signs we’d take seriously, and what you can do when you see them.
1. Your Buyer Has Gone Quiet
Early in a sale, buyers are responsive. They answer the agent’s calls, chase their solicitor, and ask when they can measure up for curtains. When that energy drains away, it usually means one of two things: they’ve found another property, or they’ve hit a problem with their finances that they haven’t told anyone about yet.
Don’t wait for the silence to become a withdrawal. Ask the agent to get a direct update on where the buyer is with their mortgage application and their own sale. A buyer who’s still committed will give a clear answer. One who’s wavering will be vague, and vagueness is your cue to keep other interested parties warm.
2. The Survey Has Triggered A Renegotiation
Survey-stage collapses have become the single biggest cause of failed sales in recent data, overtaking chain breaks. The pattern is familiar: the surveyor flags damp, roof wear or electrics, the buyer’s lender imposes a retention or the buyer takes fright, and a request for a reduction lands a few days later.
Plenty of sales survive a renegotiation, and how you handle it decides the outcome. Ask to see the survey. Get your own quote for the work. If the reduction asked for is close to the real cost, meeting it may be sensible. If it’s far above it, that’s usually a buyer looking for an exit, and you’re better off knowing now.
3. The Mortgage Offer Is Taking Too Long
A mortgage offer normally arrives within three to five weeks of application. If your buyer applied six weeks ago and there’s still nothing, something’s wrong. Common causes include the lender’s valuation coming in below the agreed price, questions about the buyer’s income, or the lender taking issue with the property itself, which happens with flats above shops, non-standard construction and short leases.
Press the agent for specifics: has the valuation been done, what did it say, and has the lender raised any queries? A buyer who’s hiding a down-valuation will often reappear later with a reduced offer, so it pays to find out early.
4. Something’s Stuck Further Up The Chain
You can do everything right and still lose your sale because a buyer three links away has had their mortgage declined. Chains are only as strong as their weakest member, and most sellers have no idea what’s happening beyond their immediate buyer.
Ask your agent to run a full chain check and tell you honestly where each link stands. If one party is dragging, every other link’s agent should be chasing them. If one link has effectively collapsed and the chain is waiting for a replacement buyer, you need to know, because that wait can run for months.
5. Exchange Keeps Slipping
The clearest sign of all. A target exchange date is agreed, then it moves, then it moves again, and each time the reason is a little thinner than the last. Solicitors do get busy, and some delays are real, but a pattern of slipping dates almost always means somebody in the transaction isn’t ready to commit.
When this happens, set a firm date with the whole chain and make it clear you’ll review your options if it passes. Buyers who are serious find a way to meet it.
What To Do When You See The Signs
Spotting a problem early gives you choices that disappear later. There are practical ways to speed up a slow house sale before it collapses, from chasing the chain to tightening up your own paperwork so your link is never the delay. Keep underbidders informed so you’ve somewhere to turn. Make sure your solicitor has everything they need to issue the contract pack again at short notice. And have a realistic conversation with yourself about how long you can afford to wait.
For some sellers, the answer is to stop depending on a chain altogether. If you’d rather have a fixed completion date than another round of waiting, Property Buyers Today will make you an offer within 24 hours, cover the survey, legal fees and EPC, and complete on a date you choose. Our offers fall between 70% and 85% of market value, and because we buy with our own funds, there’s no mortgage to be declined and no chain to break. If your current sale does fall over, that certainty can be worth more than the difference in price.
Reading The Signs Honestly
None of these five signs guarantees a collapse, and plenty of wobbly sales make it over the line. What they do tell you is that it’s time to ask direct questions and prepare a fallback. Sellers who do that lose a few weeks when a sale fails. Sellers who don’t lose months.