A replacement extension in a Conservation Area

This mid-terrace shop with accomodation above in London had Grade II Listed status, which means that the scope for extending was limited. But by replacing a run-down rear extension with a sympathetic two-storey extension, the house has been granted a new lease of life.

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The Grade II-listed status of this mid-terrace shop with accommodation above – set within a Conservation Area in Clerkenwell, central London – meant that there was limited scope for extending.

George Omalianakis at GOA Studio came up with the idea of replacing a run-down rear extension with a more sympathetic two-storey design to give a new lease of life to both the shop and the residence. The challenge was how to keep a balance between new interventions and the historic building fabric while also ensuring that part of it remains in commercial use. The council only granted permission to convert the building – part of a group-listed block of shops – into a single family home on the condition that the change of use was to a living/work unit, with the front shop area retained as an office and exhibition space.

The extension replaces the existing kitchen, and the bathroom above, and has almost the same proportions as the demolished building. However, to achieve high ceilings in the new rooms, the floor level was lowered by excavating the garden. This meant underpinning the boundary walls and strengthening the existing foundations at the rear of the house. Lime mortar and reclaimed London bricks were used so that the extension blended seamlessly with the house.

The project took five months to complete. Its original budget was £80,000, but the final cost was closer to £100,000, including a full renovation and repair work to the original structure.

In the gallery: The new window and door openings replicate the proportions and style of the original joinery. Double glazed units improve thermal performance.

Architect: George Omalianakis ARB/ RIBA, GOA Studio, 020 313 70905, goastudio.co.uk.