The City, University of London building is set to open in early 2019.

Ssustainability principles feature highly in the scheme which will include a car-free zone, secure cycle parking and tree planting alongside water reuse.

Barry Millar, Operations Director from Waterscan said: “The London Plan encourages the reuse of water and we worked through various options for this project including greywater recycling to intelligent attenuation.

“Tight space onsite led to us recommending and creating a bespoke combined rainwater harvesting and attenuation system: an exceptionally cost effective solution when balancing spatial and environmental considerations.”

It is estimated that City, University of London will save around £4,500 each year by adopting this approach.

Rainwater harvesting systems are suitable for all commercial applications where there is adequate roof space to harvest sufficient water to achieve a good return on investment.

They can reduce mains water consumption by up to 30% with additional benefits arising from reducing risks of stormwater flooding, decreased sewerage charges and lower energy costs associated with water supply.