The 280,000 sq ft fit-out for insurance broker Jardine Lloyd Thompson sees ISG return to the site after completing a job for a client across the first and second floors of the building.
The broker will take nine floors at the property, as well as the basement and roof space, with ISG delivering a high specification 34-week fast-track programme.
ISG will be carrying out a significant mechanical and electrical upgrade to achieve a BREEAM Excellent environmental performance rating.
This will include the UK’s largest installation of low-energy Zumbotel lighting systems and targeting a waste recycling figure of 90% for the scheme.
Paul Cossell, managing director of ISG Fit Out, said: “Securing a contract win of this scale and prestige is an excellent result.
“Our recent industry successes at the BCO Awards undoubtedly played a key role in our appointment by JLT and we are particularly pleased to be returning to St Botolph Building to once again showcase our capabilities.”