One Angel Court

This £125m redesign of the landmark office tower in the City of London is undergoing a complete overhaul of its 25-storeys to provide Grade A office space with an increase from 18,000 to 28,000m2.

One Angel Court Entrance

Project Details
  • Client

    Mitsui Fudosan

  • Architect

    Fletcher Priest

The redesign involves the stripping back of the octagonal tower to its core and installing newly constructed floor plates to increase the tower diameter by over 3m. The building will be fully re-clad with floor to ceiling glazing to offer an uninterrupted 360 degree view. The substantial windows of the ‘sky floors’ will feature distinctive fritted glazing and high performance glass to provide a sun shield whilst optimising daylight penetration into the office space to reduce electric lighting requirements.

A significant aspect of the development is the retention and modification of its existing core as well as the re-use of approximately 60% of the existing foundations. These will reduce the overall construction cost and programme delivery.

Sustainability initiatives include exemplary energy performance; greywater and rainwater harvesting (to reduce water consumption by 50%); inclusion of comprehensive cycle facilities and biodiversity enhancements.

The redevelopment has involved detailed analysis of the existing core and the provision of a temporary stability system for the core tower utilising a new concrete jacket between basement and ground. The existing floors will be replaced with compositely designed steelwork to allow a 3m extra tower diameter whilst the existing concrete floors will be replaced with lightweight floors to allow higher ceilings.

Low carbon initiatives include an on-site combined heat and power unit as a primary heat source supplemented with low NOx, high efficiency condensing boilers. This represents a 29% improvement over the carbon emission requirements of the Building Regulations. Energy efficient LED lighting will also be used.

The tower will be served by six Mitsubishi lifts which operate at 4m/s, with regenerative lift drives to reduce the power consumption.

Waterman teams have produced integrated 3D models of the structures and MEP services for incorporation in the BIM process which has given a valuable head start to the trade contractors and construction manager.

It is being twin tracked as one of the first BREEAM 2014 commercial office developments in London.

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