Lyons O'Neill

Bolingbroke Grove

This major refurbishment of a large semi-detached property included lowering the entire building footprint to convert an unusable cellar to a luxury basement extending into the rear garden, an internal steel frame to allow an open plan living space, and an efficient roof structure to improve head height on the second floor.

The basement was formed by a combination of traditional underpinning to lower the existing level of the cellar, and 3.5m height retaining walls to extend the footprint of the building at the front and rear of the property, satisfying challenging party wall conditions on both boundaries.

A 10m span was achieved over full-width sliding doors via a bespoke steel truss supporting the masonry façade above, with primary steelwork allowing demolition of several internal walls. Cantilevering steelwork was designed to create a cantilevering roof over the rear patio spanning 4m in two directions.

Architect Quartet Architecture
Contractor Foxbury Building
Client Private