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⚡ Leasehold Reform Act 2024: Major new rules affecting premiums. Learn More →

Lease Extension Premium Calculator

RICS deferment rate methodology · Updated 2026

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Property Type
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Property Details
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Lease Details
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Your Results

What type of property is it?

The property type determines which legislation applies.

🏚

Flat / Apartment

1993 Act. 90-year extension. Ground rent to peppercorn.

🏠

House

1967 Act. Right to buy freehold at a modest premium.

💡 Flats: Extend 90 years with ground rent to zero. Houses: Buy your freehold and own outright.

Tell us about your property

Enter the freehold value — what the property would sell for with a long or 999-year title.

Add 5–8% to a current leasehold listing price to estimate the freehold equivalent.
£

About your current lease

Enter the unexpired term and current annual ground rent.

Check your title deeds or Land Registry.
£
Enter today’s figure. Enter 0 if peppercorn.
Receive a copy of your estimate. Never shared.
Tool 2

Freehold Purchase Estimator

Estimate the cost of buying the freehold of your leasehold house.

£
£
Estimated Freehold Premium
Ground Rent Capitalisation
Reversion Value
Total with Fees (~£4,500)
Marriage value does not typically apply for houses. Professional fees add approximately £3,000–£5,500. Always instruct a specialist solicitor.
Tool 3

Marriage Value Calculator

Marriage value is only payable when your lease has fewer than 80 years remaining.

Only applies to leases below 80 years. If your lease has 80+ years, marriage value is zero and not payable.
£
£
Marriage Value Component
Current Leasehold Value
New Leasehold Value
Your Share (50%)

What This Means

→
→The Leasehold Reform Act 2024 proposes to abolish marriage value. This provision requires secondary legislation and is not yet in force.
Tool 4

Ground Rent Capitaliser

Calculate the present value of your ground rent stream at the RICS 5% deferment rate.

£
Ground Rent Capitalisation
Annual Ground Rent
Years Purchase (YP)
At 5% deferment rate
Annual Saving
By extending to peppercorn
This is the ground rent capitalisation element of your extension premium. Use the full calculator to see all three components combined.
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