Claremont Square

Glazed Side Infill Extension on a Grade II Listed Home

A Grade II listed Georgian end of terrace house in the New River Conservation Area benefited from a new contemporary side infill extension using minimally framed sliding glass doors and a complete modern renovation.

The aim of the development was to reconfigure the existing duplex maisonette to maximise its connection with the southwest facing rear garden and reconfigure the living accommodation across the ground floor.


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Reform Architects / Archea architecture  


Islington, London

A new glazed infill extension has been added which runs through into the existing 70's rear extension, together with new Innovare flush glazed windows to the existing extension for the flush finish against the traditional brick.

Extra consideration must always be taken with listed buildings and with those located in conservation areas, AONB or national parks. So this listed London townhouse in a conservation area has to be designed in a way that does not disrupt the traditional aesthetic of the area and didn't harm the existing building.


Frameless structural glazing is a popular choice for these types of projects as the minimal design does not detract from the existing architecture. This is why a structural glass roof was specified for the side infill extension, supported with a slim steel T section, to seamlessly connect the old traditional building with the new contemporary extension.

The minimally framed sliding glass doors create an idyllic connection with the garden whilst providing primary access. The slim 21mm sightlines maximise views and natural light into the modern extension. 

A great design feature for this renovation project was the oriel window seat in the kitchen. The design of the boxed window seat is frameless and minimal, providing an additional area for an influx of daylight into the kitchen area. 

Internally, brick walls were left exposed to give the new living area some character as well as providing the space with a strong connection to the outdoors. As the garden floor and building exterior use the same toned brick this new living space bridges the gap between indoors and out.

The minimal design aesthetics of the renovation project provides bright light-filled open-plan living spaces, as well as carefully preserving the traditional features of the grade II listed property.