What happens when a flat lease runs out, and why it matters

When you buy a leasehold flat, you're not buying the bricks. You're buying the right to live there for a fixed number of years. That number starts ticking down the day the lease is granted, and it never stops.

A brand new flat might come with a nine hundred and ninety nine year lease. Lovely. No problem for several generations. But plenty of flats in England and Wales, especially in older mansion blocks and converted Victorian houses, have leases that are already well into their second half. Some are sitting at sixty years, fifty years, or even less. And that's where things get genuinely complicated.

Most buyers don't think about this until a solicitor flags it, or worse, until a mortgage lender refuses to lend. Understanding what actually happens as a lease shortens, and what the law says about it, can save you from buying a flat that's very hard to sell on.

Here's the blunt truth. If a lease runs all the way down to zero, ownership of the flat reverts to the freeholder. You lose it. No compensation, no right to stay as an owner. That's the legal default, and it's been that way for a long time.

In practice, very few leases actually expire in that dramatic way, because leaseholders have statutory rights to extend before it gets that far. But those rights only protect you if you act. The lease itself doesn't pause, and it doesn't care whether you know about the rules.

As a lease drops below eighty years, something called marriage value kicks in. This is the extra premium you pay when extending, calculated on the idea that combining a short lease with the freehold creates value that didn't exist before. The freeholder gets a share of that uplift, which can be substantial. The Leasehold and Freehold Reform Act 2024 was supposed to abolish marriage value, but that specific part of the Act is not yet in force and has no confirmed start date as of September 2026. So if your lease is under eighty years, marriage value still applies and your extension will cost more. Confirm the current position with a solicitor before you rely on this.

Below sixty years, things get really uncomfortable. Mortgage lenders start refusing outright, buyers with cash become rare, and the flat can effectively become unsellable on the open market.

The good news is that leaseholders in England and Wales have real statutory protections, and they're worth knowing.

Under the Leasehold Reform, Housing and Urban Development Act 1993, qualifying leaseholders have the right to extend their lease by ninety years on top of whatever is left, and to reduce the ground rent to a peppercorn, meaning effectively zero. The freeholder cannot refuse. They can negotiate on price, and you may end up at a tribunal if you can't agree, but they cannot simply say no.

A big change came into force on thirty first January 2025. Before that date, you had to own your flat for two years before you could claim a statutory lease extension. That two year qualifying period has now been abolished. So if you buy a flat with a short lease today, you can start the extension process immediately. That's genuinely useful if you're buying a short lease flat at a discount and planning to extend.

For flats granted new long residential leases from thirtieth June 2022, the ground rent is capped at a peppercorn under the Leasehold Reform (Ground Rent) Act 2022. Older leases can still carry meaningful ground rents, which affect value and sometimes mortgage eligibility too.

You also have the right, along with other leaseholders in your building, to collectively buy the freehold. That's called collective enfranchisement, and it's a separate process with its own rules and costs, but it's worth knowing it exists.

Mortgage lenders think about risk differently to buyers. They're not just asking whether you can afford the repayments. They're asking what happens if they ever need to repossess and sell the flat themselves.

A flat with a short lease is harder to sell, so it's harder for a lender to recover their money. That's why lenders commonly want around seventy to eighty five years left on a lease at the point you apply for the mortgage, and they also look at how many years will remain when the mortgage term ends. Most lenders want thirty to forty years left at the end of the mortgage, though each lender sets its own specific figures and you should check with yours directly.

So if you're buying with a twenty five year mortgage and the lease has sixty years left today, a lender will see that only thirty five years remain when the mortgage ends. Some lenders will be fine with that. Others won't touch it. There's no universal rule, which is why you need to check with your broker or lender early.

This is also why a flat with fifty years on the lease is so hard to sell, even to a cash buyer. Most cash buyers know they'll want to sell eventually, and they know the next buyer will need a mortgage. So the problem compounds.

Before you make an offer, you can do some basic homework yourself. HM Land Registry's free property search on gov.uk will tell you whether a property is freehold or leasehold and give you the title number. That's it, but it's a start.

To see the actual lease and find out how many years are left, you need to pay seven pounds to download the title register from gov.uk. You can also download a copy of the filed lease itself for seven pounds. That document will show the original lease length and the date it was granted, and from those two numbers you can work out what's left.

Don't rely on what the seller or estate agent tells you about the lease length. Check the document. Solicitors sometimes find the actual figure is different to what was advertised, occasionally by years.

Once you're in the conveyancing process, your solicitor will check this properly and flag any issues. But knowing the basics before you instruct anyone means you won't waste money on surveys and legal fees for a flat you'd never be able to mortgage.

Sometimes, yes. A flat with a short lease will often be priced below market value to reflect the cost and hassle of extending. If you buy it at a genuine discount, extend the lease, and sell it with a long lease, you can do well. The abolition of the two year qualifying period from January 2025 makes this more practical than it used to be, because you can start the extension process straight away rather than waiting.

But you need to go in with your eyes open. Get a specialist leasehold solicitor to advise you before you exchange. Get a lease extension valuation from a surveyor who knows leasehold work. Understand what the extension will cost, including the premium to the freeholder, your legal fees, the freeholder's legal fees (which you pay), and any valuation fees. If the lease is under eighty years, factor in marriage value, because the premium will be higher.

Also think about your exit. Who will buy from you, and on what terms? If you're extending the lease yourself before selling, great. If you're selling with a short lease and hoping the buyer deals with it, your buyer pool shrinks dramatically.

Short lease flats aren't automatically bad investments. They're just complicated ones, and complexity costs money.

If you're buying your first flat, the simplest advice is to avoid leases under eighty years unless you really know what you're doing and have specialist advice. Not because it's impossible, but because you've got enough to think about already.

If you fall in love with a flat and the lease is shorter than you'd like, don't panic. Get the numbers. Talk to a leasehold solicitor. Find out what an extension would cost and factor it into your offer. A good solicitor will have seen this many times and will tell you whether the deal still makes sense.

Leasehold law in England and Wales is changing, and has been changing for a few years now. Some of the reforms in the Leasehold and Freehold Reform Act 2024 are in force, others aren't yet. Always confirm the current legal position with a qualified solicitor rather than relying on anything you read online, including this. The law moves, and the details matter.