London Borough Lease Extension Analysis

Postcode-level context is one of the strongest signals when evaluating a lease extension quote. The same lease terms can produce very different premiums depending on where the flat sits. Postcode is not the only driver — unexpired term matters just as much, as our analysis of lease extension cost by years remaining and premiums below 80 years shows. To put your own figure in context, you can benchmark your quote against comparable tribunal decisions.

• Property values differ materially from one postcode district to another
• Leasehold markets — flat type, age and density — differ across London
• The comparable evidence available to surveyors and tribunals differs by area
• Tribunal outcomes can vary even where lease terms look similar

The table below shows the London postcode districts with the highest median tribunal-decided lease extension premiums in the LeaseIntel dataset. Figures are medians across all tribunal cases analysed in each district.

Source: LeaseIntel analysis of 2,349 First-tier Tribunal decisions. Districts with insufficient sample sizes are not shown. Additional districts will be added as the dataset grows.

Visual ranking of median lease extension premiums across London postcode districts.

• SW1X (Belgravia)£959,905
• SW3 (Chelsea)£400,748
• W1G (Marylebone)£320,691
• SW1 (Westminster)£298,450
• SW7 (South Kensington)£176,312
• NW8 (St John's Wood)£132,931
• E10 (Leyton)£39,200

Number of tribunal cases analysed per district. Larger samples produce more reliable medians.

• E10 (Leyton)26 cases
• SW3 (Chelsea)14 cases
• NW8 (St John's Wood)13 cases
• SW1 (Westminster)11 cases
• SW1X (Belgravia)10 cases
• SW7 (South Kensington)8 cases
• W1G (Marylebone)6 cases

A geographic view of analysed postcode districts. An interactive map is in development; the placeholder below shows the relative positions of districts currently in the dataset.

Published First-tier Tribunal decisions show how disputes have been resolved when both sides' valuations were tested under scrutiny. Across London districts, three patterns are consistent:

• Comparable evidence matters. Tribunals weight comparable transactions and prior decisions heavily — and those are inherently local.
• Local context matters. Local value trends, building stock and ground rent patterns shape what the tribunal considers reasonable.
• Similar lease lengths can produce different outcomes. Two flats with near-identical unexpired terms can land on materially different premiums once location is taken into account.

Several factors combine to produce the district-level differences observed across tribunal decisions:

• Property values. Higher underlying flat values typically produce higher premiums and larger marriage value contributions.
• Lease lengths. District-level stock differs — some areas have far more sub-80-year leases than others.
• Building types. Period conversions, mansion blocks and modern developments carry different valuation profiles.
• Ground rent structures. Historic ground rent patterns vary by district and developer.
• Valuation assumptions. Deferment rates, capitalisation rates and relativity evidence differ depending on local comparables.

The most useful comparison is not simply district-wide medians. Medians can hide wide ranges driven by lease length, ground rent profile and property value.

The best benchmark comes from comparable tribunal decisions involving similar properties — flats with broadly similar unexpired terms, ground rents and value bands in the same or adjacent district.

LeaseIntel benchmarks user-supplied quotes against comparable First-tier Tribunal decisions, rather than publishing a single district-wide figure.

• AnalysisLatest Tribunal Outcomes
• AnalysisLease Extension Cost by Years Remaining
• AnalysisLease Extension Premiums Below 80 Years
• AnalysisInformal vs Statutory Lease Extension
• AnalysisDistrict deep-dives (SW1X, SW3, NW8 …)Coming soon