ISG has won a £50 million scheme to redevelop and refurbish Woolworth House in London's West End.

The mixed-use scheme, for General Projects with Henderson Park, will increase the building's gross area by circa 100,000 sq ft. to over 236,000 sq ft, offering 172,000 sq ft. of lettable space and increase floor areas by over 40%. It includes the complete refurbishment of the existing eight-storey office building, located at 242 Marylebone Road in the London Borough of Westminster.

Renamed Metropolis, the new building will benefit from both office and retail facilities, with external green roof terraces across every floor. An events auditorium, rooftop-bar, on-site coffee shop, cyclist zone as well as new health and wellbeing amenities complete the specification.

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A new extension will significantly increase outdoor and green space, adding over 6,000 sq ft of new landscaped gardens. To achieve this, the scope of work includes infilling the existing courtyard area up to the seventh floor, providing tiered planted terraces and the structure will be extended with various additions across floors three to eight using a steel frame with cross laminated timber (CLT) slabs.

In addition, the existing roof plant enclosures will be removed and consolidated, allowing the creation of rooftop office pavilions on level five and eight.

Designed by London architect AHMM, the environmental performance of the refurbished building will be boosted to a BREEAM rating of Outstanding. Careful retention of existing building material will result in over 4,500 tonnes of carbon saved during the construction process and diverted from landfill. The new scheme will also achieve industry leading Wired and AirRated scores.

The use of engineered timber floors to all building extensions has dramatically reduced embodied carbon, equating to a 73% improvement against RIBA 2030 targets. The masonry facades, concrete frame and cores will also be retained while CLT will be used for all new floors forming the building's extension.