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Case Study
40 Holborn Viaduct 

We walked into a pitch-black room, where the building manager said, 'This is how we run meetings now to save energy!' Although fun and lighthearted, the 40 HV team doesn't mess around when it comes to occupier engagement. Through small actions and minor reprogramming, the building achieved major energy savings and became the first-ever winner of the CUBE award

March 2022 - February 2023

Location: London


1 year achievements

1st Place

in competition


energy savings

1,664,711 kWh

total savings

£ 529,316


Building characteristics


16,467 m2

total area 



Construction completed


1 person per 10m2

Occupational density


Trend BMS System

Building systems


8 parking spaces



5 passenger lifts & 1 goods lift Lifts

BREEAM/New Construction (Excellent), Renewable Energy Commitment Certificate, EPCS from D to C 


Top actions

Management and behaviour

  • Conducted regular and quarterly CUBE meetings combined with green committee of the building

  • Circulated newsletters to tenants to create awareness and discuss ideas

Minor technical and re-programming

  • Installed LED lights and PIR (passive infrared) sensors

  • Turned down gas boiler flow temperature from 80°C to 60°C to save energy

  • Optimised chillers and boilers by using programmable thermostats: switch off boilers when outside temp is 15°C and chillers stop running when outside temp drops to -2°C

  • Reduced corridor lighting to 10% and installed motion sensors for lights in garage

  • Installed CO2 sensor on each floor to maintain ventilation system and which also reduced the running time of fan coil units

  • Used night purging technique in summer to introduce fresh cool air at night to reduce overheating

  • Limited water purging only to the weekends to reduce the use of water pumps

  • Lagged pipes on roof with aluminium casing


Don't just take it from us

What BNP Paribas says

“Great to have seen the level of engagements from diverse building stakeholders - from contractors to landlord and building managers to occupiers. It's this level of deep, continuous and diverse collaboration that's needed to reach net-zero and other shared sustainability goals. "

-Joshua Spencer, BNP Paribas RE

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