The project for developer Alchemi Group will see an office block at 55 Victoria Street converted into 54 luxury apartments.

Sisk are due to start on site in April and will extend the existing 8-storey concrete frame building to 12 floors. Building floor plates will also enlarged with a major rear extension to the building.

The existing stone facade will be stripped to be later clad in handmade charcoal fired bricks from Denmark.

The building, designed in a collaboration with Stiff + Trevillion Architects, will achieve a BREEAM Score of 70% – Rating ‘Excellent’.

The finished project will boast a range of studio flats to split-level Penthouse residences, a gymnasium, and two communal gardens – a lushly landscaped rear courtyard and an 8th floor Sky Garden with expansive south facing views.

Sisk Director, Mike Higgins said: “Alchemi’s in-depth understanding of the Central London residential market, and their ability to consistently bring excellent products to market, makes them a key client with whom we can forge a long term relationship.”

Alchemi has also started a contract to reclad and remodel of an office block for 20 flats in London’s Westborne Grove, near Notting Hill. Irish contractor John Paul Construction started on the project in January.