A1 Flues
A1 Flues

Leadenhall Building

Leadenhall Building

Project brief

The Leadenhall Building at 122 Leadenhall Street in London is a 610,000 sq ft office tower that is 736 ft (224m) tall. It's a joint venture between British Land and Oxford Properties that was designed by Rogers Stirk Harbour + Partners and replaces a 14-storey building on the same site.

It has 52 floors and has become known as the Cheesegrater because of its distinctive wedge shape.

Our design

The key challenge on this project was to create bespoke steel supports for the boiler flues and generator exhausts, as it is an aesthetic feature of the building that the flue system is visible - from the 42nd floor to the top of the structure. Having a distinctive wedge shape means that the flue system has to rise at a 10° angle between floor levels, as it could not be attracted to window frames.


"A1 Flue Systems is as professional as ever in designing and installing industrial chimneys. Their expertise in designing and installing exhaust flue systems will aid four generators installed by Broadcrown on the Leadenhall Building project to operate at their maximum performance levels because the whole system has been installed correctly. A1 has been on our preferred supplier list for a number of years, and we always go to them on the big, challenging projects because of their level of expertise and innovation - as well as their capability to deliver on time and within budget." Max Roys, Project Manager, Broadcrown Ltd

Facts at a glance

Client name: Broadcrown

Project value: £300,000

Time to complete: 12 months

Location: London

Leadenhall Building