The Pump House

Structural Designer

Webb Yates Engineers

Client Name



London, UK

PRINCIPAL CONTRACTOR: Clean Lines Construction

ARCHITECT: Fabric Space


The structure of this mezzanine in a Victorian pump house building is entirely formed with 1.2m x 0.7m cast iron plates that interlock to form both the floor and balustrade. The pieces are sand cast using ductile iron with the pattern modelled in Rhino and CNC cut from timber, due to the repetition cast iron was an efficient and cost effective solution. The form represents the flow of load and stress through the pieces and is optimised for weight and strength while maintaining a very thin depth.

Judge's comment:

The Pump House is a historic workshop constructed in 1903 by the London Hydraulic Power Company. The renovation of the internal space included the addition of a mezzanine floor entirely formed by interlocking 1.2m x 0.7m cast iron panels, bolted together to form both the floor and balustrade.

The Pump House involved ingenious use of cast iron, which has many advantages over steel, as a cheaper raw material that can be cast into endlessly complicated shapes. Working closely with a local foundry and contractor, the engineers used a single mould to cast the panels, reducing manufacturing time and cost.

Contact us

Telephone: +44 (0)20 7235 4535
Email: [email protected]

Social media


© Copyright 2022 - The Institution of Structural Engineers, 47-58 Bastwick Street, London, EC1V 3PS, United Kingdom
Registered with the Charity Commission for England and Wales No. 233392 and in Scotland No. SC038263