The 80-Year Lease Rule: Why It Could Cost You Thousands

The 80-year lease threshold is the single most important milestone for any UK leaseholder. Learn how marriage value works and why crossing this line can double your extension cost overnight.

What Is the 80-Year Rule?

Once the unexpired term on a lease falls below 80 years, a concept called "marriage value" becomes payable as part of any lease extension premium. This can dramatically — and suddenly — increase the cost of extending your lease. It is the single most important financial threshold in leasehold enfranchisement.

What Is Marriage Value?

Marriage value is the increase in combined value of the leasehold and freehold interests that arises from merging them through an extension. This uplift is split 50/50 between the parties. Above 80 years, marriage value is legally presumed to be zero and is not payable.

Marriage value can add 50–150% to the cost of a lease extension for sub-80-year properties. For a flat worth £400,000, this could mean an additional £20,000–£60,000 on your premium.

A Tale of Two Extensions: Same Property, Different Costs

Consider a flat valued at £350,000 with ground rent of £200 per year:

• 85 years remaining: Premium approximately £4,500–£7,000 (no marriage value)
• 79 years remaining: Premium approximately £9,000–£16,000 (marriage value now payable)
• 70 years remaining: Premium approximately £18,000–£30,000
• 60 years remaining: Premium approximately £30,000–£50,000

Should I Wait for the 2024 Act to Abolish Marriage Value?

The 2024 Act proposes abolishing marriage value but requires secondary legislation with no confirmed date. Your lease shortens every day you wait. Consult a surveyor to model both scenarios before deciding — for most people, acting now is the safer financial decision.

The Mortgage Problem

Most high-street lenders require at least 70–85 years remaining at mortgage application. A flat with 65 years remaining often fails standard mortgage checks, making it very hard to sell and significantly reducing its marketability and value.

What to Do Right Now

1. Check your lease length in your title deeds or Land Registry
2. If within 5 years of 80, seek specialist advice immediately
3. Use our free calculator to compare your current cost vs waiting
4. Instruct a specialist leasehold solicitor and RICS surveyor