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New fire safety regulations for high-rise buildings in London mean plans to build almost 125,000 homes may be scrapped, according to consultants Lambert Smith Hampton and Connells.

A pipeline of 243 buildings in planning with the potential for providing 123,632 homes in the capital may be returned to the drawing board or abandoned, the analysis by LSH and Connells suggests. It said the schemes were 鈥渦nder threat of significant delay, or even being completely mothballed鈥� because of the new rules.

London mayor Sadiq Khan announced in February that the government鈥檚 proposal that second staircases be included on all new 30m buildings across the UK would apply in the capital with immediate effect. This is despite the England-wide regulations having yet to come in.

The aim of the new regulations is to provide to a secondary means of escape for residents in the event of a fire. As a result of Khan鈥檚 immediate adoption of the policy, plans for new buildings above 30m in London must have two stairwells before being signed off by the Greater London Authority.

Developers have put a string of major schemes on hold so they can be redesigned to accommodate this new regulation which comes in the wake of the Grenfell Tower fire, with Wates and Havering Council recently pauing work on a 1,380-home estate regeneration scheme.

Berkeley and Peabody are among the developer to have also talked publicly about how their development pipelines are likely to be affected.

鈥淕iven the tragic circumstances that led to the revision of fire safety regulations, there are few plausible grounds on which to oppose their implementation,鈥� Mary-Jane O鈥橬eill, head of planning at LSH, said. 鈥淏ut all of us involved in the process of development do need to process their implications and come up with some pragmatic solutions as a priority.鈥�

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The Department for Levelling Up, Housing and Communities proposed the mandate on second staircases on 23 December 2022 to 鈥渕ake buildings safer鈥�.

Khan鈥檚 decision to expedite the implementation of the government鈥檚 proposal in London followed calls by the RIBA and the Chartered Institute of Housing for the threshold at which the rule kicks in to be lowered further to 18m. Khan鈥檚 deputy mayor Tom Copley said yesterday that the GLA wouldn鈥檛 rule out lowering the threshold.

Second staircases were not recommended as part of Judith Hackitt鈥檚 review of building safety regulations conducted in the aftermath of the 2017 Grenfell fire which killed 72 people. However, in response to Hackitt鈥檚 report in 2018 the RIBA said all high-rise buildings should have more than one means of escape.

At the time, RIBA recommended second stairwells on buildings of 11m or higher. The government estimates the new fire safety measures will cost 拢1.6bn UK-wide over a decade.

Delays caused by the regulations may hit building targets in local authorities with a large number of high-rises pending, such as Tower Hamlets, Southwark, Greenwich and Newham, the analysis by LSH and Connells found.

鈥淭here is no silver bullet on the horizon that will unlock the uncertainty surrounding tall buildings,鈥� O鈥橬eill said. 鈥淗ousebuilders are unlikely to go back to the drawing board on these schemes until there is much more clarity around the required design standards.