New London Architecture

Harley Street Proton Beam Therapy


This challenging project entails both the sensitive restoration of Grade II listed buildings and collaboration with physicists on the careful integration of cutting-edge proton beam technology.
Knowledge Networks: London and the Ox-Cam Arc

Knowledge Networks: London and the Ox-Cam Arc

Located on a constrained site in Central London, this project creates a new facility for a new type of proton beam therapy using a compact linear design developed with scientists from the CERN centre in Switzerland. Despite the challenges of working on a Grade II site, the boundaries of what could be achieved were pushed to their limits. The facility, planned across two town houses, a 15m deep basement and extending underneath the mews road, will retain the scale and charm of the original streetscape. The patient journey will beautifully encompass restored reception rooms, views across a field of lavender and a modern interior housing the latest treatment equipment.

Project information






1900 sq m


May 2019


141 Harley St, Marylebone, London W1G 6BQ, UK

Team Credits


Sonnemann Toon Architects LLP


The Howard De Walden Estate

Proton Beam Therapy Specialist

Advanced Oncotherapy

Listed by

Sonnemann Toon Architects LLP

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