City of London over-station development tops out

Spanning over the Metropolitan and Circle Lines as they enter Liverpool Street Underground Station, a 10-storey City of London office development has officially topped out.

1 Liverpool Street, being developed by Aviva Investors, has required 4,000t of structural steelwork, which has been installed by William Hare, working on behalf of main contractor Mace.

Designed by Eric Parry Architects and Robert Bird Group, the complex scheme also sits directly over the much deeper Elizabeth Line tunnels, wraps over a six-storey high Crossrail box (ventilation shaft), and has to span over various other contemporary and historic infrastructure.

Mace Project Director, Jonathan Emmines, said: “On this scheme we have to bridge over live railway tracks, while also considering and protecting other subterranean assets, such as a ticket hall and service corridors. We are only able to achieve this via a series of large steel transfer structures.”

Aiming to achieve a BREEAM ‘Outstanding’ rating, sustainability is at the forefront of the building’s design. Fully electric in operation, 1 Liverpool Street is set to achieve significant energy and carbon savings throughout its lifespan – saving an estimated 110 tonnes of carbon per year.

Carbon savings will be achieved through a range of measures including meeting the building’s heating and cooling demands through air source heat pumps, triple glazing, high-efficiency chillers and energy-efficient lighting.

The project is due to complete in January 2026.