Extending a flat's lease in the UK: why it matters and what the 80-year threshold means

In England and Wales, homes are owned in two ways. Freehold means you own the building and the land outright. Leasehold means you hold the home on a long but finite lease, while the land and building belong to the freeholder (the landlord). Most flats are sold this way. The lease shortens over time, and it is important to notice in good time. Here is how and why to extend it, based on gov.uk.

Why extend a lease at all?

A lease steadily runs down. While many years remain few people worry, but a short remaining term causes real problems: the flat is harder to sell, and lenders are reluctant to offer a mortgage on it. So owners extend in advance to protect the home's value and the ability to sell or remortgage.

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How many years can you add?

If you qualify, a flat's lease is usually extended by 90 years on top of what is left, and a house's by 50 years. These are added to the current remaining term. Whether you qualify depends on conditions set out on gov.uk and by the Leasehold Advisory Service (the government advice service on leasehold).

What is the 80-year threshold?

A key rule: once 80 years or less remain on the lease, extending it gets much more expensive. That is because below 80 years an extra sum called "marriage value" is added in the landlord's favour. So it is wiser not to wait until the term nears 80 years, but to extend earlier, while it is cheaper.

How to check your remaining term

The lease length is in your lease and in the Land Registry records. If you are unsure how many years are left, check this first — that figure drives both the urgency and the cost. For a flat, you can estimate the cost of extending with the Leasehold Advisory Service calculator.

How to start the process

You can ask the landlord to extend at any time, and sometimes the two sides agree informally. There is also a formal, statutory route that gives the leaseholder certain rights; it is more involved but protects your interests. As large sums and legal detail are involved, people usually hire a surveyor and a leasehold solicitor.

What about leasehold reform?

Leasehold reform is under way in the UK, with the law gradually shifting rules in leaseholders' favour. Some provisions come in over time, so before extending it is worth checking the current position on gov.uk and with the Leasehold Advisory Service — the new rules may help your case. But the general rule stands: the earlier you act, while plenty of the term remains, the cheaper and calmer it is.