How LeaseIntel produces a benchmark
Transparency is core to what we do. Below is how the data is sourced, how benchmarks are calculated, and where the limits of the analysis sit.
Data sources
Tribunal decisions published over more than twenty years by the First-tier Tribunal (Property Chamber) and predecessor bodies. Decisions are structured into a comparable case database covering lease term, region, ground rent, marriage value treatment and outcome. The current headline analysis of that dataset is published as Lease Extension Statistics 2026, and the individual decisions that sit behind it are indexed in the Tribunal Database.
Dataset hierarchy
Different reports on LeaseIntel cite different sample sizes. Each is a transparent subset of the same underlying database:
- 6,000+Tribunal decisions collected
First-tier Tribunal (Property Chamber) rulings across England & Wales (2005–2025).
- 2,349Structured for analysis
Parsed into comparable variables: lease length, value, ground rent, deferment, relativity.
- 1,009Tribunal-determined premiums
Used for all headline £ statistics — median, mean and extremes.
- 792London borough analysis
- 595Lease-length analysis
- 443Property-value analysis
How benchmarks are calculated
For each quote we identify a pool of comparable tribunal decisions based on region and lease characteristics. We then compute a typical range (interquartile range) and a median outcome from that pool. Your quote is positioned against this range to indicate whether it sits below, within or above typical outcomes. Worked examples of how those pools behave in practice appear in our cost by property value and London borough analyses.
Confidence framework
Large pool of recent, closely comparable decisions.
Reasonable pool of broadly comparable decisions.
Limited comparable decisions; treat as directional only.
Limitations
- LeaseIntel is not a valuation.
- LeaseIntel cannot account for every property-specific factor.
- Tribunal decisions may not reflect all current market conditions.
Related Guides
Deeper reads on lease extension costs, marriage value, the Section 42 notice process and how to evaluate your quote.
Lease Extension Cost Guide
Typical premiums, what drives cost and how the 80-year threshold changes everything.
Marriage Value Lease Extension
How marriage value is calculated, when it applies and how it affects your premium.
Section 42 Notice Explained
The statutory route to extend your lease, notice requirements and the 6-month trap.
Is My Lease Extension Quote Too High?
How to evaluate a freeholder's quote against real tribunal decisions.
Latest Tribunal Outcomes
What the First-tier Tribunal does and how comparable decisions help benchmark a premium.
Disclaimer
LeaseIntel provides information and benchmarking only. It is not legal, valuation or financial advice. Users making material financial decisions should obtain independent professional advice.
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