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Vertical extension at Mortimer Street, Central London

18 August 2021

Vertical extension at Mortimer Street, Central London

Commissioned by: LSJ Engineering LTD

Main contractor: GPF Lewis

Team of: 8

Duration: on going



The main part of this job was to erect a vertical extension on an existing building,

this would then form a new 5th floor level.


We had to strengthen the steel frame on the existing building at critical points of the current roof level in order to take the new structure’s weight.


The new steel weighed over 60 tonnes!, The only way to get these to the new level is by lifting them with a mobile crane. The contractor arranged for weekend road closures to set up a 130 tonne mobile crane and lift the new steelwork into place, this spanned over several weekends.


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