This project consisted of a basement excavation under the existing building footprint together with full alteration and general refurbishment to a semi-detached, Hampstead house located within the Redington and Frognal Conservation area. The new basement space accommodates a home-gym with lightwell. An incorporated green wall visible from the gym provides a pleasant outlook, improves air quality and brings a freshness to this part of the house. Finishing materials were selected from clients’ preferences, and were integrated with the architects’ designs to propose and maintain a thoughtful, sensitive, pared down balance of simplicity.