⚡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 and how the premium is calculated.

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Flat / Apartment

1993 Act applies. 90-year extension (990 years under 2024 Act once in force). Ground rent reduced to peppercorn.

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House

Leasehold Reform Act 1967 applies. Right to purchase the freehold at a typically modest premium.

💡 Flats: Extend your lease by 90 years (or 990 years under the 2024 Act) with ground rent reduced to zero. Houses: Buy your freehold and permanently convert to full ownership.

Tell us about your property

Enter the market value on a freehold basis — what it would sell for with a long freehold or 999-year title.

Check Rightmove for comparable freehold sales. Add 5–8% to a leasehold listing price to estimate the freehold equivalent.
£

About your current lease

Enter the unexpired term (years remaining) and current annual ground rent.

Subtract years elapsed since lease was granted from the original term. Your Land Registry title confirms the exact figure.
£
Enter today's figure. If peppercorn (zero), enter 0.
We'll email your estimate and updates on leasehold reform. Never shared or sold.

Calculating…

Tool 2

Freehold Purchase Estimator

Estimate the cost of buying the freehold of your leasehold house under the Leasehold Reform Act 1967 (as amended).

£
Enter the open-market freehold value of the property.
£
Tool 3

Marriage Value Calculator

Marriage value is only payable when your lease has fewer than 80 years remaining. Calculate exactly how much it adds to your premium.

Marriage value only applies when your lease is below 80 years. If your lease has 80 or more years remaining, marriage value is zero and is not payable.
£
Must be under 80 years for marriage value to apply.
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Tool 4

Ground Rent Capitaliser

Calculate the present value of your ground rent stream — the ground rent capitalisation element of your lease extension premium.

£
Your current annual ground rent payable to the freeholder.
The unexpired term on your current lease.
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