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Image credit: ISG Ltd

Project Brief:


The Entopia Building, a retrofitted 1930s Telephone Exchange at 1 Regent Street, Cambridge, will be transformed into an ultra-low carbon sustainability hub, and new home for the Cambridge for Sustainability Leadership (CISL).

The Entopia Building aims to be an international exemplar for sustainable office retrofits, demonstrating how an existing office building can be made highly energy efficient in its redevelopment and use, while supporting the enhanced wellbeing of staff and visitors. The building will also provide a base for the Institute’s digital learning programmes which reach more than 4,000 executives each year through remote learning. High tech video conferencing facilities and collaborative digital platforms will enable its network of 16,000 alumni, fellows and associates to collaborate and engage with its work remotely.

The Entopia Building aims to achieve multiple sustainable building certifications, including BREEAM (Outstanding), the Passivhaus ‘Enerphit’ standard, Well (Gold) certification, alongside the application of ‘circular economy’ principles to minimise the volume and impact of natural and made-made resources used in the building.

Site address:   1 Regent Street, Cambridge
Size:   3000sqm
Total Cost:   £ 12.8M
Project Manager:   Brian Williams
Contractor:   ISG
Architect:   Architype
Status:   Work started March 2021
Work completed July 2022
More information:  

News article

Entopia Building website