Question to the Ministry of Housing, Communities and Local Government:

To ask His Majesty's Government what assessment they have made of the impact of post-planning early- and late-stage reviews on development viability in London.

Planning practice guidance on viability states that plans should set out circumstances where review mechanisms may be appropriate and how they will operate. The application of this and wider guidance in London is a matter for local planning authorities and the Greater London Authority.

While viability pressures are impacting residential development in many parts of the country, we know they are particularly acute in London. Those pressures were already resulting in proportions of affordable housing being reduced on schemes following viability assessment. According to Greater London Authority (GLA) monitoring data, the average affordable housing level of referable applications that have been approved through their viability tested route was 20 per cent between 2022-2024.

To address this, the Secretary of State and the Mayor of London announced a new package of support for housebuilding in London that included developers to access a new, time-limited planning route to incentivise build out. This will sit alongside the existing Fast Track and Viability Tested routes and will enable developers to secure planning permission without a viability assessment on private land within certain conditions.

The GLA opened a consultation for this time-limited measure, and the proposal of the targeted withdrawal of guidance that limits density, on Thursday 27 November which can be found at Support for Housebuilding LPG | London City Hall (attached).

My Department also launched a consultation on the temporary relief from the Community Infrastructure Levy and changes to Mayoral planning powers which can be found at Support for housebuilding in London - GOV.UK (attached). These consultations close on 22 January 2026.