Project Overview

8 Bishopsgate is a 50-storey tower under construction in the centre of the City of London. It will be an office-led, mixed-use building, with retail space and a public viewing gallery. The proposed building will include high sustainability and low energy initiatives and has been designed to achieve a BREEAM Outstanding rating.


  • Targeting BREEAM Outstanding rating
  • 30% reduction in steel tonnage (tn/m2) against comparable benchmark building
  • Passive design and energy efficiency measures will be implemented to achieve 26.5% carbon emissions savings
  • Operational energy is calculated at 40% better than the Part L 2013 benchmark building
  • Optimising the active façade reduced the peak solar gain by 50%, leading to a reduction in overall cooling capacity of over 800 kW, with associated reduction in size and embodied carbon of mechanical and electrical equipment

Approaches Used

  • Reducing steel tonnage was a key driver for the design and through optimisation of each individual beam and flange, the overall steel tonnage (tn/m2) was reduced by 30% against comparable benchmark buildings.
  • The active façade responds directly to solar gain and glare – minimising energy consumption at the same time as maximising availability of views and daylighting.
  • The design team designed an increased delta T on CHW and CDW systems by optimising chiller efficiency against pumping energy, reducing pump capacity by 25%.
  • On-floor AHUs with CO2 control to each tenancy allow fan energy to be minimised and also give maximum flexibility to tenants.
  • AHUs with single change-over coils reduce fan power, allow high heat recovery efficiency and use of lower heating temperatures compatible with heat pumps.
  • Heat recovery heat pump provides 45% of annual heat energy requirement by recovering heat from the cooling system, simultaneously reducing energy consumption of the cooling plant.
  • Roof space has been shared between heat rejection, amenity space and photovoltaics combined with blue roof stormwater attenuation systems.
  • Advanced rainwater storage and harvesting systems will be employed to achieve sustainable urban drainage.
  • Louvres with photovoltaic panels are proposed to be installed on the roofs of the plant room, the pavilion, and level 48 to reduce carbon emissions.
  • Heat exchanger rooms for future connection into a district heating network are also proposed to be installed to increase the energy savings.
  • Data Analytics software (Demand Logic) has been used to interrogate BMS and all energy meters, both as a tool to improve commissioning and soft landings, as well as a tool for building optimisation following handover.