ISG has won a £16.9m deal to refurbish a seven-storey London office at 72-75 Fenchurch Street.
Property investment firm GreenOak has appointed the contractor to the Dixon House refurbishment.
ISG will partially demolish the Grade II-listed office and add three floors with 60,000 sq ft of Category A open-plan office accommodation.
ISG Southern regional managing director Stuart Deverill said: “This latest scheme plays to our significant strengths delivering highly complex structural refurbishments in logistically challenging and busy locations.
“Dixon House is set to become an excellent showcase for those visionary owners looking to transform their outdated property assets to maximise demand and commercial value.”
ISG is currently the subject of a takeover bid by major US shareholder Cathexis.
How will ISG do it?
The original Portland Stone façade will be retained before ISG demolishes the existing building to the fourth floor slab and removes two staircases across the lower part of the building.
It will demolish a “significant amount” of the remaining structure down to basement level to enable complete reconfiguration of the building core, with a new triple lift shaft added.
Temporary works will be required to ensure structural stability of the existing building during both demolition and construction phases.
Horizontal supports (Flying Shores) will temporarily support the retained façade and core as part of the complex engineering measures employed on the project.