1 Liverpool Street

Developing 1 Liverpool Street above and alongside operational Underground lines, Elizabeth line infrastructure and a Royal Mail tunnel presented exceptional structural and logistical constraints. Railway assets, exclusion zones and a seven-storey ventilation shaft left only 25% of the site available for new foundations. Critical trackside works were restricted to overnight access windows, providing approximately three usable working hours once safety procedures were completed. Access from a single road, neighbouring development at Broadgate and coordination across multiple trackside contracts added further complexity.

G&T provided Cost Management services, supporting the commercial management of complex enabling, basement, trackside and main construction works. A lightweight structural design accommodated ten storeys within the weight allowance originally intended for eight, while existing foundations were tested and reused. Construction of the southern steel frame progressed alongside the basement and railway protection deck, with sequencing carefully controlled to balance loads. Our cost advice helped the team assess specialist construction requirements and the implications of restricted working windows, logistics and coordination across multiple separate contracts.

The development unlocks valuable office space on a highly constrained central London site while accommodating operational transport infrastructure. Its cast aluminium façade provides a distinctive architectural identity, complemented by upper-level terraces. G&T’s Cost Management supported informed commercial decisions across specialist construction packages, helping the team manage the financial implications of phased delivery and restricted railway access while realising the site’s development potential.