Leasehold

Does a surveyor calculate the cost of extending a lease that has fewer than 80 years left?

No. GOV.UK’s shared-ownership guidance says that when the remaining lease drops below 80 years, it can be much more expensive to extend, and that you should check the landlord’s rules and the cost before you buy. The premium is a valuation and legal process. A home survey does not produce it, and this page does not invent the premium.

Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.

What is the fuller explanation?

The 80-year line on that GOV.UK page is a warning about cost, aimed at shared owners and useful to any buyer whose solicitor is looking at a short lease. Reform of leasehold law has been moving in stages. Do not treat a blog’s claim that marriage value has already vanished as a substitute for your solicitor reading the current rules. Ask them what a statutory extension would cost in outline, and ask a valuer if they say a valuation is required.

The survey still tells you whether you would be extending a lease on a building that needs a new roof or a new lift. A cheap extension on a block with empty reserves and a rating 3 roof is not cheap living. Read the two together. HM Land Registry and the lease are where the term comes from, which is the solicitor’s document, not the surveyor’s.

What should you ask your surveyor?

Which building defects would you still want priced even if the lease were long?
Are you able to see the items a service charge would have to repair after an extension?
What, if anything, in your report depends on the unexpired term? It should be nothing.

What are the typical next steps?

Ask the solicitor for the unexpired term from the lease and the register.
If it is near or below 80 years, ask them what an extension involves under the current law before you exchange.
Do not ask the surveyor to knock a lease premium off a condition rating.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

Does the 80-year warning apply only to shared ownership?

The sentence sits on GOV.UK’s shared-ownership page. Short leases are also a problem outside that scheme. Ask your solicitor how it applies to this lease, rather than ignoring the warning because the tenure label differs.

Can you extend after you buy?

Often yes, and the cost can be higher if you wait. GOV.UK tells shared owners to check the cost before they buy. Take that timing seriously.