Keybridge House Monitoring

Keybridge House Monitoring

About This Project

Keybridge House, located in London, was formerly BT Headquarters and was built by the Ministry of Defence in the 1960s. The new Keybridge House is the tallest brick built tower in the UK.
Keybridge House comprises a 17 storey tower block and 5 storey ‘Podium’ building arranged over two basement levels extending beneath the entire site footprint. The building has most recently been used as a telephone exchange and associated office space.
The current buildings on site were to be demolished and the site redeveloped with the construction of a 35 storey tower, a 21 storey tower and three low rise blocks, rising to a maximum nine storeys. The basement was to be retained for the new development.

Survey Requirements

• Confirm the structural movements are in line with the predicted ground movements
• Ensure any significant movement is identified at an early stage to allow sufficient mitigation measures to be implemented
• Provide evidence, which may be used to determine the cause of any damage to third parties

The monitoring areas surveyed:

• St. Anne’s Church
• Public House ‘The Griffin’
• Network Rail Overbridge
• UKPN Substation
• BT Chamber
• Diaphragm Walls of Basement

Survey Specifications

Murphy surveys were required to carry out 3D manual monitoring and manual levelling of the existing and listed structures using 3D targets, corner cube prisms, antivandal dome prisms and survey studs. Our monitoring team also carried out automated environmental monitoring with vibration units.

Other Parties Involved

WSP, Network Rail, BT, UKPN


Mount Anvil

Survey Type

Structural Monitoring
Monitoring & Network
Rail Structural


Property Development, Hotel & Residential


Leica Total Station, Leica DNA03 Digital Level, M60 AvaTrace Vibration, Monitor with Tri-axial, Geophone



Project Cost

c. £200k


Vauxhall, London


Case Studies, Monitoring Solutions