A listing says "lease: 82 years remaining" and nothing else, as though the number speaks for itself. Or your solicitor's report on title comes back with 76 years and your broker's tone changes.

Here's the plain version. Eighty years isn't a safety threshold and it isn't a lender's rule. It's the point at which extending the lease gets suddenly and permanently more expensive, because of one line in a 1993 statute. Crossing it costs real money, and the reforms you've probably read about haven't fixed it yet.

This is England and Wales. Scotland got rid of residential leasehold long ago.

What the 80 years actually is

It comes from marriage value.

Extend a lease and the flat becomes worth more, meaningfully more, because a 166-year lease is a better thing to own than a 76-year one. Marriage value is the name for that uplift, and under Schedule 13 of the Leasehold Reform, Housing and Urban Development Act 1993 the freeholder gets half of it. Paragraph 4(1) puts the landlord's share at 50 per cent.

Except when it doesn't apply at all. Paragraph 4(2A) of the same Schedule says that where the unexpired term of your existing lease exceeds eighty years at the relevant date, "the marriage value shall be taken to be nil".

So above 80 years you pay the freeholder for the value of what you're taking off them, and nothing more. Below 80, you pay that plus half of the uplift your own extension creates. Same flat, same freeholder, same paperwork, different bill.

It's a cliff, not a slope. At 80 years and a day there's no marriage value. At 79 years and 364 days there is. And because the uplift is a function of what the flat is worth, the cliff is taller on an expensive flat than a cheap one.

There's no honest way to put a figure on the premium in an article. It turns on the flat's value, the ground rent, and valuation rates that are themselves being consulted on right now. Every number you'll find quoted online is someone else's example. A specialist enfranchisement valuer will give you a range for your flat, and that's the only number worth having.

The date that counts is the day you serve notice

This is what catches people out, and it's why a short lease is an urgent problem rather than a background one.

The 80 years is measured at "the relevant date". Section 39(8) of the 1993 Act defines that as the date your notice is given to the landlord under section 42. Not the day you complete. Not the day you ask the freeholder what they'd want for it. Not the day you instruct a solicitor.

So a flat sitting at 80 years and two months when you offer can be under 80 by the time you exchange. Purchases routinely take four or five months, and nobody involved is watching that clock for you.

One thing has got easier. You used to have to own the flat for two years before you could serve a section 42 notice. That requirement went on 31 January 2025, when section 39(2) of the 1993 Act was omitted by the Leasehold and Freehold Reform Act 2024. You can now serve on the day you complete.

If a lease is close to 80 years, ask your conveyancer early whether the seller should be serving notice before completion and passing the benefit of it to you, and get the answer in writing. It's a well-trodden route and it's also the sort of thing that gets raised too late to be useful.

What a statutory extension gets you

Section 56(1) of the 1993 Act: a new lease for a term expiring 90 years after the term date of your existing lease, at a peppercorn rent.

Two things follow from that. The 90 years is added to what's left, so a flat with 76 years becomes 166. And the peppercorn wipes out the existing ground rent completely, whatever it says in the lease. For a lot of flats that second part is the real reason to do it.

What lenders do about it

Lender appetite, not the law, is usually what forces the decision.

As a rough shape of the market, many lenders want somewhere around 85 years or more remaining, most mainstream lenders decline below roughly 70, and a common condition is that the lease term has to exceed the mortgage term by a margin of 30 to 40 years. Treat all three as indicative. Individual criteria vary a lot and they change, so your broker's read on a specific lender beats any general article, including this one.

The knock-on matters more than the headline. A term that's too short for mainstream lending doesn't just complicate your purchase, it shrinks the pool of people who can buy it from you later. That's the part that shows up in the price you eventually get.

"The reforms have fixed this" is wrong, as at August 2026

This is where most of what's published on short leases is out of date, and it's expensive to get wrong.

The Leasehold and Freehold Reform Act 2024 does abolish marriage value, and it does replace the 90-year extension with 990 years at no ground rent. Both are on the statute book. Neither is in force.

Schedule 13, the marriage value machinery quoted above, is prospectively omitted by section 36(5) of the 2024 Act. Prospectively, with no commencement date. It is still live law today.
The substitution of the 990-year term into section 56(1) sits in section 33(2) of the 2024 Act and is listed among the changes yet to be applied.

The government's own plain English explainer, published alongside its consultation on 15 July 2026, says it intends to bring the changes into force "as soon as possible" and sets out what has to happen first: the consultation on valuation rates has to conclude, secondary legislation has to follow, and some fixes need a further bill. That consultation on deferment and capitalisation rates closes on 23 September 2026 and is still open as this is published.

There's also live litigation. Freeholders challenged the enfranchisement reforms in the High Court. The government won, and as gov.uk puts it, the decision is under appeal.

None of which is a reason to be gloomy about reform. It is a reason not to plan a purchase around it. If you're looking at a flat with 81 years left and someone tells you marriage value is gone, they're describing a law that hasn't commenced. Buy on the rules as they are.

The ground rent hiding behind the lease length

A long lease can still be the problem, which surprises people.

Leases granted roughly between 2005 and 2020, often on 125 or 999-year terms, frequently carry clauses doubling the ground rent every 10, 15 or 25 years. Lenders often refuse to lend where ground rent doubles on a short cycle, which can leave a flat with 900 years left effectively unsellable. The Competition and Markets Authority took enforcement action against developers and freeholders over these clauses and several agreed to convert them, so some leases have been fixed and others haven't.

There's a second reason the ground rent figure matters. Historically, ground rent above £250 a year, or £1,000 in London, risked a long lease being treated as an assured tenancy, which brings forfeiture consequences with it. It's another thing to have your conveyancer look at directly rather than assume.

The fix for both is the same as the fix for a short lease: a statutory extension, which takes the ground rent to a peppercorn.

What to do about it

In this order, and most of it before you agree a price.

Get the remaining term from the lease, not the listing. Listings state lease length inconsistently, and "999 year lease" in the particulars has been known to mean a 999-year term granted in 1908. Ask the agent in writing, and treat a non-answer as an answer.
Work out where the term will be at completion, not today. Add four or five months and see which side of 80 you land on.
Read the ground rent clause, including the review provisions. A doubling clause is a lending problem regardless of how many years are left.
Ask whether the seller has ever approached the freeholder about a price, or served a notice. If they have, there may be a valuation you can see.
Ask your broker which lenders will take this term alongside your mortgage term. Not "is 78 years fine", but "is 78 years fine for a 30-year term with this lender".
If the term is anywhere near 80, get a specialist enfranchisement valuer's range before you commit to a price. The premium is a real cost of buying the flat and it belongs in your offer, not in a nasty surprise a year later.
If it's just above 80, treat it as a deadline. Diary the date, and talk to your conveyancer about serving before it passes.

The honest summary

Eighty years is the most expensive number in leasehold, and it's measured on the day you serve notice rather than the day you buy. The 2024 Act will remove the cliff, and as at August 2026 it hasn't, with no date set. So a flat at 81 years is a deadline and a flat at 79 is a cost you should be pricing into your offer.

And if nobody in the chain can tell you the exact remaining term and what the ground rent does over the next twenty years, that's not a paperwork gap. That's the answer.

Worth reading next: what a service charge should look like on the same flat, whether the block needs an EWS1 form, and how to read what the listing is and isn't telling you.

This is general information, not legal, financial or mortgage advice. Leasehold law in England and Wales is mid-reform and the position described here is as at August 2026. Lender criteria change constantly. Get a specialist enfranchisement valuation and take advice from your conveyancer and broker before making a decision.