Analysis of 595 First-tier Tribunal decisions shows lease extension premiums increase progressively as lease length falls, with the sharpest changes occurring once the 80-year threshold is crossed.
Benchmark My Quote Against Tribunal CasesThe 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?
Confidence in each band reflects the number of underlying tribunal cases. Bands with fewer than 20 cases should be interpreted cautiously.
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.
Premium includes:
No marriage value is included in the statutory premium.
Premium includes:
Marriage value is added to the statutory premium.
Tribunal evidence consistently shows that lease extension premiums change once the unexpired term falls below 80 years because marriage value becomes part of the statutory valuation.
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 CasesLeaseIntel 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.
Read the full LeaseIntel methodology for dataset construction, variable definitions and validation checks.
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.
Generic calculators provide estimates. LeaseIntel benchmarks lease extension quotes against real tribunal outcomes and comparable cases.
Benchmark My Quote Against Tribunal CasesLeaseIntel provides information and benchmarking based on tribunal decisions. It does not provide legal advice or valuation advice.
Independent analysis of UK First-tier Tribunal (Property Chamber) lease extension decisions, using a proprietary research methodology and a structured dataset of published tribunal rulings.
Journalists, researchers and industry professionals can contact LeaseIntel Research for commentary, custom data cuts or collaboration on tribunal-driven analysis.
leaseintel@geoff.money595 decisions grouped by lease length — from under 40 years to over 80.
Median premiums are 3.5× higher below 80 years than above. Analysis of 595 tribunal decisions.
What tribunal outcomes show once marriage value becomes payable — with distribution charts across 595 decisions.
The smallest premiums on record — and what they reveal about long-lease extensions.
Informational use only
LeaseIntel provides research and general information based on published tribunal decisions. It does not provide legal, valuation or financial advice. Tribunal decisions depend on their individual facts, and past decisions do not predict the outcome or valuation of another case.