How much does a lease extension cost with 80 years remaining?

Tribunal decisions show that premiums at around 80 years sit near the inflection point where marriage value becomes payable. Exact figures vary with property value, ground rent and local comparable evidence, but tribunal outcomes consistently show a step up in cost as the lease moves from just above to just below 80 years.

How much does a lease extension cost with 70 years remaining?

By 70 years remaining, tribunal outcomes typically show materially higher premiums than leases above 80 years. Marriage value is firmly in play and the diminishing term value works against the leaseholder. The specific premium depends on property value, ground rent and comparable cases.

Does every lease extension become more expensive below 80 years?

In most cases yes, but not universally. Marriage value is statutorily payable below 80 years, which adds a discrete component to the premium. The size of that effect depends on property value and ground rent — some leases see a sharp jump, others a more gradual increase.

Can tribunal decisions predict my lease extension premium?

Tribunal decisions do not produce a single predicted number. They show how comparable disputes were resolved when both sides' valuations were tested — which is a more useful benchmark than a single calculator estimate.

Why do similar flats sometimes have different premiums?

Property value, ground rent profile, deferment and relativity assumptions, and the specific comparable evidence each side relied on can all move the answer significantly, even where the unexpired term is similar.

Lease Extension Cost by Years Remaining

Key insight

The relationship between lease length and premium is not linear. Costs often increase gradually above 80 years, then accelerate sharply once marriage value becomes payable.

Learn more: What Is Marriage Value?

Premium Distribution by Years Remaining

Tribunal decisions containing complete lease-length data have been grouped into unexpired-term bands. The distribution below shows where LeaseIntel currently has the strongest evidence base and highlights areas where sample sizes remain limited.

Sample Size by Lease Length Band

Confidence in each band reflects the number of underlying tribunal cases. Bands with fewer than 20 cases should be interpreted cautiously.

BandCasesConfidence

Under 60 years64 casesHigh Confidence
60–65 years88 casesHigh Confidence
65–70 years112 casesHigh Confidence
70–75 years134 casesHigh Confidence
75–80 years121 casesHigh Confidence
80–85 years53 casesHigh Confidence
85–90 years7 casesLow Confidence
90–95 years4 casesLow Confidence
95+ years5 casesLow Confidence

Source: LeaseIntel Tribunal Database

Sample: 595

Period: 2005–2025

How Costs Change Around the 80-Year Threshold

Analysis of tribunal decisions consistently shows a change in valuation dynamics once leases fall below 80 years. At this point marriage value becomes payable, creating an additional component within the premium calculation. For deeper analysis of short-lease outcomes, see our research on premiums below 80 years.

81+ yearsAbove the threshold

Below 80 yearsMarriage value payable

Source: LeaseIntel Tribunal Database

Sample: 595

Period: 2005–2025

Why Lease Length Matters

Diminishing lease value. As the unexpired term falls, the value of the leasehold interest reduces — increasing the premium required to extend it.
Marriage value. Below 80 years, marriage value becomes payable and is added to the premium. It can be a significant component.
Tribunal evidence. Tribunals weigh comparable decisions and surveyor evidence heavily. Outcomes reflect what panels accepted on the evidence, not formula estimates.
Comparable but different. Two flats with similar values can produce very different premiums depending on lease term, ground rent and the specific comparables relied on.

What Tribunal Decisions Reveal

LeaseIntel analyses First-tier Tribunal decisions to understand how premiums vary across comparable cases. Each decision is structured into variables — unfettered value, unexpired term, ground rent, deferment and region — so quotes can be benchmarked against the closest outcomes rather than a single formula estimate.

This positions LeaseIntel as a tribunal-data platform rather than a valuation calculator. The aim is to show how comparable disputes have actually been resolved, not to predict a single number.

For the rule that drives much of the change in premium as the term shortens, see our guide to the 80 year lease rule, and for dedicated analysis of short-lease outcomes our research on premiums below 80 years.

Compare Your Quote Against Comparable Tribunal Cases

Tribunal outcomes are driven by lease length, property value, ground rent and the comparable evidence accepted by the tribunal. Benchmark your quote against similar cases from the LeaseIntel database.

Benchmark My Quote Against Tribunal Cases

Frequently asked questions

Methodology

Inclusion criteria, exclusions, sample size and calculation methodology vary by analysis. Statistics are based only on cases containing sufficient data for the relevant variables.

This analysis groups 595 First-tier Tribunal lease extension decisions by unexpired term at the valuation date. Bands with fewer observations are flagged with a confidence indicator and should be interpreted cautiously.

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.

See How Your Quote Compares

Generic calculators provide estimates. LeaseIntel benchmarks lease extension quotes against real tribunal outcomes and comparable cases.