What is the 80-year lease extension threshold?

Under the Leasehold Reform, Housing and Urban Development Act 1993, when a lease falls below 80 years unexpired, the leaseholder must pay 50% of the 'marriage value' as part of the extension premium. Marriage value is the increase in property value that results from extending the lease. Above 80 years, no marriage value is payable, making the premium substantially lower. The 80-year mark is therefore a critical threshold in lease extension timing.

How much more does it cost to extend below 80 years?

The LeaseIntel dataset shows median premiums of £8,076 for leases above 80 years versus £28,300 for leases below 80 years — a difference of 3.5 times. The actual premium increase for a specific property depends on the property value, the exact lease length, the ground rent and the specific marriage value calculation. For most properties, crossing the 80-year threshold adds tens of thousands of pounds to the cost.

I have exactly 80 years remaining — should I extend now?

The tribunal data strongly supports acting before the lease falls below 80 years. With exactly 80 years remaining, you are at the threshold. If your lease will fall below 80 years in the near future, extending or at minimum serving a Section 42 notice now protects the current valuation date. The notice locks in the premium calculation at that point, even if completion takes longer. We recommend seeking immediate advice from an enfranchisement solicitor if your lease is approaching or below 82 years.

What is marriage value and why does it only apply below 80 years?

Marriage value is the difference between the property's value before and after the lease extension. When a lease is extended from, say, 75 years to 125 years, the property becomes more valuable — typically because it is easier to sell and mortgage. The leaseholder pays 50% of this uplift to the freeholder. The 80-year threshold is set in legislation (the 1993 Act); above 80 years, the marriage value is assumed to be zero for calculation purposes, regardless of actual market conditions.

Does the 80-year threshold still apply after leasehold reform?

As of mid-2026, the Leasehold and Freehold Reform Act 2024 has been enacted but not all provisions have commenced. The abolition of marriage value for lease extensions has been signalled as government policy but had not been brought into force at the time of this analysis. Leaseholders should check the current position with a specialist solicitor. If marriage value abolition is enacted, the cost differential above and below 80 years will change significantly.

The 80-Year Lease Extension Threshold

Median premium — above 80 years

£8,076

39 tribunal decisions

Median premium — below 80 years

£28,300

556 tribunal decisions — 3.5× higher

Marriage value premium uplift

3.3×

Median with vs without marriage value

Above and below 80 years: what the tribunal data shows

The difference in tribunal-determined premiums above and below 80 years is one of the starkest findings in the LeaseIntel dataset. Across 595 decisions with lease length data, leases above 80 years show a median premium of £8,076. Leases below 80 years show a median of £28,300 — 3.5 times higher.

This is not a coincidence. It is a direct consequence of how the statutory valuation formula works. Below 80 years, the leaseholder must pay 50% of the marriage value — the uplift in property value that results from the extension — in addition to the reversionary and ground rent components. Above 80 years, no marriage value is payable. The 80-year threshold is therefore a legislative cliff edge built into the premium calculation itself.

Lease position	Decisions analysed	Median premium	Mean premium
Above 80 years	39	£8,076	£9,798
Below 80 years	556	£28,300	£87,132

Source: LeaseIntel Tribunal Database

Sample: 595

Period: 2005–2025

The marriage value effect in the data

Looking at the dataset from the marriage value angle — rather than by years remaining — reinforces the picture. Cases where marriage value was identified as applying show a median premium of £30,534. Cases where it was not applicable show a median of £9,230. The ratio between the two is 3.3x.

This is significant because it confirms that the 80-year threshold is not the only factor at work. Even below 80 years, cases with low property values or very modest ground rents may have a marriage value component that is relatively small. Conversely, the closer a lease is to zero years, the more dominant the marriage value component becomes — in the most extreme cases, it accounts for the majority of the total premium.

Marriage value	Decisions analysed	Median premium	Mean premium
Applies	316	£30,534	£96,411
Does not apply	69	£9,230	£12,947

Source: LeaseIntel Tribunal Database

Sample: 595

Period: 2005–2025

What happens at 79 years — the most expensive year

From a timing perspective, the year in which a lease crosses from 80 to 79 years is the single most consequential in the extension timeline. Before this point, premiums above 80 years are modest and the extension can often wait. After this point, marriage value becomes payable on every year of delay.

The tribunal data shows leases in the 75–79 year band carrying a median premium of £9,620, compared with £6,950 for leases in the 80–84 year band — an increase of approximately 38% from just crossing the threshold. As the lease shortens further through the 70s, the effect compounds: each year below 80 adds to both the marriage value (as property prices generally rise) and the reversion component (as the lease approaches shorter and shorter terms).

For a property worth £400,000, the marriage value component at 79 years remaining is typically £15,000–£30,000. At 70 years remaining, that figure may have grown to £25,000–£45,000 or more, purely as a consequence of waiting.

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Frequently asked questions

Methodology

LeaseIntel analyses published First-tier Tribunal (Property Chamber) decisions on lease extension premiums. Each decision is parsed into a structured record covering unexpired term at the valuation date, property value, ground rent profile, deferment and capitalisation rates, marriage value treatment and the final premium determined.

Analyses only include decisions containing the specific lease-term and valuation data required for that study.
Cases are grouped by unexpired term at the valuation date (not the date of the decision).
Sample sizes vary between analyses because not every decision records every variable.
Small sample groups are flagged with a confidence indicator and interpreted cautiously.
Where decisions span multiple flats or hearings, each lease is treated as a separate observation.

Caveats

Tribunal decisions represent disputed cases rather than the entire market.
Not all decisions contain every data field.
Sample sizes vary by analysis.
Small sample groups should be interpreted cautiously.

Benchmark your quote

These figures are based on 595 tribunal decisions with lease length data. Your own premium depends on your specific lease length, property value, ground rent terms and whether marriage value applies. LeaseIntel compares your circumstances with similar tribunal decisions to provide a personalised benchmark — including whether acting now vs later materially changes your expected premium.

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Independent · Not a valuation or legal advice · Tribunal outcomes, not formula estimates

The 80-Year Lease Extension Threshold: What Tribunal Data Shows

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