What is a property chain? How chains work, why they break and how to avoid one

A property chain is a line of house sales that depend on each other. You're selling to someone who is selling their own home, and you're buying from someone who is buying somewhere else. Because nobody in England or Wales is legally bound until contracts are exchanged, a delay or a pull-out anywhere in the line can hold up, or collapse, every sale in it.

This guide explains how chains work, why they break, how long they take, and the realistic ways to sell without one. It covers England and Wales. The rules are different in Scotland.

How a property chain works

GOV.UK puts it simply: "A chain starts with a buyer who isn't a seller." That's usually a first-time buyer, an investor or someone who has already sold. It ends with a seller who isn't buying, such as an estate being sold after a death, someone moving into rented or a care home, or someone moving abroad.

Everyone in between is both a buyer and a seller. Here's a typical four-link chain:

Link	Who	Depends on
1	A first-time buyer with a mortgage	Their mortgage offer
2	You, selling your flat and buying a house	Link 1 completing your sale
3	The family selling you their house and buying a bigger one	You completing your purchase
4	A retired couple selling their bigger house and moving into rented	Nothing: the chain ends here

Because each sale pays for the next purchase, everyone usually exchanges contracts on the same day and completes on the same day. The Council for Licensed Conveyancers notes that the completion date depends on the length of the chain, "as everyone needs to agree the same completion date". GOV.UK's buying guide says completion is often around two to four weeks after exchange, though the two can happen on the same day.

Open and closed chains

• A closed chain is one where, in GOV.UK's words, "each buyer has also found a purchaser for their home". Every link has a buyer in place.
• An open chain is one where one or more buyers haven't yet sold. Somebody still has to find a buyer before the chain can move, so it's slower and riskier.

A closed chain is stronger, but it isn't secure. Until exchange, any buyer or seller in it can still pull out or change their offer.

Why do property chains break?

An offer isn't legally binding in England and Wales until contracts are exchanged, so a chain is only as strong as its weakest link. The usual reasons a link fails are:

• Mortgage problems. A buyer's lender values the home for less than the agreed price, or the buyer's circumstances change and the mortgage offer falls through.
• Survey findings. A survey turns up damp, structural issues or other repairs, and the buyer pulls out or asks for a lower price.
• Someone changes their mind. A job move, a relationship ending, a death in the family, or simply cold feet.
• Gazumping or gazundering. A seller accepts a higher offer, or a buyer cuts their offer just before exchange. See gazumping and gazundering.
• Slow paperwork. Missing documents, slow answers to the buyer's solicitor's questions, leasehold information that takes weeks to arrive, or a probate sale waiting for the grant.
• No onward home. A seller in the middle can't find somewhere to buy and won't move into rented.

The government's home buying and selling reform roadmap, published in June 2026, says "around one in 3 transactions fall through", and lists cutting fall-throughs, "including those caused by property chains", as one of its aims. The roadmap also plans to make contracts binding earlier in the process, but that needs new law first and isn't in force yet.

How long does a chain take?

There's no standard time, because a chain moves at the speed of its slowest link. Two official figures give a sense of it:

• GOV.UK says selling a home "takes about 5 months on average", and that it can take longer if you're part of a chain.
• The June 2026 roadmap says that once an offer is accepted, "it takes around 120 days on average to complete".

Every extra link adds another mortgage application, another survey and another set of searches and enquiries, and all of them have to be finished before anyone can exchange. GOV.UK's selling guide warns that the longer the chain, the more chances there are for delay, and asks sellers not to become "the weak link" by being slow with paperwork.

How to judge a chain before you accept an offer

You can't control other people's sales, but you can find out what you're signing up to. Ask the estate agent:

• How many links are there below your buyer and above your seller?
• Has every buyer in the chain had an offer accepted on their own home, or is any link still on the market?
• Does your buyer need a mortgage, and do they have a decision in principle from a lender?
• Is anyone selling a probate property, a leasehold flat or a home with known problems, which can add weeks?
• Is there a buyer at the bottom who has nothing to sell?

The Property Ombudsman's code of practice for estate agents says that when an offer is being considered, the agent must take reasonable steps to find out where the buyer's money is coming from, including whether they need to sell a property or need a mortgage, and pass this to you. Where there's a chain, agents who follow the code should routinely check on the sales either side of yours and keep you informed. Our guide on how to accept an offer on a house covers these checks in more detail.

How to sell chain-free (or shorten the chain)

You can't always avoid a chain, but you can cut out part of it. The main options, with their trade-offs:

Option	What it removes	The trade-off
Sell first, then rent or stay with family	The chain above you	Moving twice, rent and storage costs, and the risk that prices rise while you're not buying
Accept a buyer with nothing to sell (a first-time buyer or a buyer who has already sold)	The chain below you	You may need to wait for the right buyer, and a mortgage buyer can still have lending problems
Accept a proven cash buyer	The chain below you and the mortgage risk	Investors and cash house buying companies usually pay below market value
Buy a home with no onward chain (an empty house, or a seller moving into rented)	Part of the chain above you	Fewer homes to choose from, and a probate seller can't exchange until the grant of probate is issued
Part exchange on a new-build	Both sides, if the developer buys your home	The developer sets the price it pays for your home, and you're limited to its new homes
Short-term borrowing to buy before you sell	Waiting for your sale	Borrowing costs and the risk of owning two homes for longer than planned; speak to an independent mortgage adviser

When waiting for the open market is the better choice: if your home is in good condition, sells easily in your area and you're not under time pressure, a normal sale through an estate agent will usually get you a higher price, even with a chain. A well-run chain of two or three links often completes without trouble.

When removing the chain can make sense: if a sale has already collapsed once, if you need to move by a fixed date, or if the house needs work that puts off mortgage buyers. Selling to a cash house buyer like us removes the chain below you, because we buy with our own money and don't need a mortgage or a sale. If you're also buying, you'd still depend on the chain above you. Our offers are below market value, and we explain how we worked out the figure. See cash buyer vs estate agent vs auction to compare the routes.

Is a cash buyer always chain-free?

No. The Property Ombudsman's code says a buyer should only be described as a "cash buyer" if the money is in the bank or can be realised in time for exchange and completion, or if they've already exchanged on their own sale and don't need a mortgage to make up the difference.

Someone who says they're a cash buyer but still has to sell their home is in a chain. Ask the agent what evidence they've seen, such as a bank statement or a letter from the buyer's solicitor, and how they checked it. The how to check a cash house buyer guide lists what to ask a buying company.

How to avoid being the weak link

You can't speed up other people's sales, but you can make sure yours never holds the chain up:

• Instruct a solicitor or conveyancer before you accept an offer, so the draft contract can go out quickly.
• Gather your documents early: ID, title deeds, certificates, warranties and leasehold papers. Our documents checklist lists them.
• Get your Energy Performance Certificate before marketing. You must have ordered one before you market your home, and it lasts 10 years.
• Answer your solicitor's questions within a day or two, and fill in the property forms honestly.
• Ask your lender for a redemption figure early, and check for early repayment charges.
• Have a plan for your own move, so you're ready if the chain is ready before you are.

What happens if the chain breaks?

If a link fails before exchange, nobody is bound, so you can't force anyone to go ahead and usually can't recover your costs unless you signed an agreement that says otherwise. Your options are to wait while the other party finds a new buyer or home, accept another offer and start again, or take a different route to sell.

Our guide to what happens if a house sale falls through goes through the next steps, and how long it takes to sell a house shows where the time goes at each stage.