How LeaseIntel produces a benchmark

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.

The database contains thousands of published tribunal records. Coverage and the number of records available for any particular calculation vary by decision type, data completeness and the current production dataset, so subsample sizes for individual analyses differ from the headline case count. Precise per-analysis counts are shown on each report against the dataset version used for that report.

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.

• LeaseIntel is not a valuation.
• LeaseIntel cannot account for every property-specific factor.
• Tribunal decisions may not reflect all current market conditions.
• Not every decision records every variable, so subsamples for individual analyses (lease length, property value, region) are smaller than the headline case count.
• Tribunal decisions describe disputed cases and do not describe the whole lease-extension market.

See the Sources & attributions page for the archives used and their licence terms.