Hampstead Hill Gardens

Glass Box Extension to Listed Brick Home in London

This glass box extension was installed onto a listed brick home in Hampstead, London as part of a rear refurbishment. The structural glass box was created using low iron structural glass. This ensured that the frameless glass box maintained its clarity and transparency against the listed building. The low iron glass was utilised across the frameless glass walls, roof as well as the structural glass beams.

Due to the listed natural of the building, the connection of the glass box to the brickwork was a highly sensitive area of the project. The brick was not to be covered with plasterboard post installation therefore, the fixings themselves had to form part of the glass box design.

In the end, we worked with the architect to develop a fixing and connection detail with brushed stainless steel brackets and channel work. This ensured that the glass extension was firmly connected to the listing building while creating an attractive combination of glass, brick and stainless steel.



Nick Wilson Architects  


Hampstead, London

Even the doors on this glass box extension were bespoke designed.

A metal frame was created with the glass stepped over the edges of this profile. This created a flush glazed design that sat within the structural glass box with no visible framing. The flush glazed doors were a key part of the building requirement for the extension to the listed building.

The glass doors were pivot opening which then further minimised the design with no visible hinges or fixings at the sides. The nature of the flush glass doors ensured that the doors merged seamlessly into the glass structure for the most minimal impact.


Structural glass beams and fins were integrated into this glass extension to provide structural supportLow iron glass was used to make these glass beams and fins to prevent them from ‘greening’. These were used as support instead of slim metal beams as they allow all natural light to pass through into the extension and reduce any obstruction to views of the brick building and garden.

Black back painting was used, creating a contemporary aesthetic to the extension and contrasting with the traditional brick building. This back painting was used to hide all fixings and silicone seals used to connect the structural glazing together. This back painting creates an almost framed effect whilst allowing the extension to be completely flush.