Why 80 Years Is a Critical Threshold

For residential leaseholders, the 80-year mark is not arbitrary - it is a legal and valuation tipping point.

Under the Leasehold Reform, Housing and Urban Development Act 1993, once a lease drops below 80 years, marriage value becomes payable as part of the premium calculation.

This can materially increase the cost of extending your lease.

What Is Marriage Value?

Marriage value represents the additional value created when:

• The short lease
• The freeholder’s reversion
• Are “married” together to create a new long lease

Once below 80 years, 50% of this uplift becomes payable to the freeholder.

In practice, this can mean:

· A lease at 82 years might cost £12,000–£15,000 to extend
· The same flat at 78 years might cost £20,000–£30,000+

The difference is often substantial.

Impact on Mortgageability and Sale

Most mainstream lenders become cautious below 80 years. Below 75 years, options narrow further.

Buyers discount aggressively once marriage value applies, meaning:

• Reduced saleability
• Increased negotiation pressure
• Longer transaction times

In valuation terms, relativity declines more steeply once the lease term falls into the 70s, which directly feeds into premium calculations.

How Premiums Are Calculated

A statutory lease extension valuation involves:

• Capitalisation of ground rent
• Valuation of the freeholder’s reversion
• Relativity between short and long lease values
• Deferment rate assumptions
• Marriage value (if under 80 years)

This is specialist valuation work prepared in accordance with the RICS Red Book and requires defensible assumptions capable of withstanding scrutiny from freeholders and their advisers.

Strategic Advice

If your lease is:

• 82–85 years – act now to protect value
• 75–80 years – seek valuation advice urgently
• Below 75 years – negotiation strategy becomes critical

Early advice can materially reduce long-term cost.

What About Leasehold Reform?

The Leasehold and Freehold Reform Act 2024 includes provisions intended to remove marriage value from statutory lease extension calculations.

However:

• The relevant valuation sections are not yet in force
• The implementation timetable remains uncertain
• The 80-year rule still currently applies

Until the legislation is formally commenced and valuation methodology amended, marriage value remains payable under the existing 1993 Act framework.

Leaseholders should therefore avoid delaying action purely in anticipation of reform, particularly where the lease term is close to or below 80 years.

If you would like a professional opinion on likely premium levels before serving a Section 42 Notice, Olden Property provides clear, independent advice designed to withstand scrutiny from freeholders and their advisers.