Studio DERA extends Mozart House in Belgravia

Tucked behind a Georgian terrace in Belgravia, Mozart House by Studio DERA reworks a historically charged site through a carefully calibrated architectural intervention. The project extends a Grade II listed property by 85 square metres, transforming a former swimming pool volume into a sequence of light-filled domestic spaces that negotiate between preservation and contemporary living.

The house occupies a site of unusual cultural resonance. It is associated with Wolfgang Amadeus Mozart, who is said to have composed his first symphony here during his childhood stay in London. The property was later inhabited by Vita Sackville-West and Harold Nicolson, further embedding it within a layered cultural narrative.

Situated within a conservation area, the building demanded a precise architectural response. Rather than imposing a visible contrast onto the historic frontage, the intervention is embedded within the depth of the rear garden, allowing the Georgian terrace to remain intact while introducing a new spatial condition behind it.

The extension is conceived as an excavation rather than an addition. Two new levels are inserted into the unusually deep plot, forming a sequence of interconnected interiors organised around a sunken courtyard. This approach enables the project to expand the domestic programme while maintaining a low visual impact within its historic context.

Movement through the house is structured as a gradual unfolding. Spaces are revealed in succession, defined by shifts in level, light and enclosure. A colonnade mediates between upper and lower courtyards, framing controlled views of planting and sky while reinforcing a sense of continuity across the intervention.

At the centre of the composition, a sculptural lightwell introduces daylight deep into the plan. Its lime-rendered surface, developed as an art piece by Guy Valentine, registers subtle changes in light throughout the day, turning illumination into an active spatial material.

Material selection plays a central role in establishing the character of the extension. A restrained palette combines travertine stone with GRC concrete panels, producing a balance between tactile warmth and formal clarity. Timber linings soften the interiors, introducing a human scale that contrasts with the mineral surfaces.

Openings are carefully orchestrated to maximise daylight penetration. Bifold glazing, skylights and courtyard-facing apertures allow light to move across surfaces, reinforcing the perception of depth and continuity between interior and exterior. The result is a controlled atmosphere defined less by gesture than by calibration.

Planting is integrated as an architectural layer rather than an afterthought. Vegetation is distributed across courtyards, terraces and a roof garden, creating a gradient between built form and landscape. Cascading greenery softens the edges of the excavation, while potted trees and layered planting introduce seasonal variation into the spatial experience.

This interplay between architecture and landscape contributes to a sense of quiet enclosure. The project does not seek visual dominance but instead constructs a contained environment where light, material and planting operate in balance.

Studio DERA approaches architecture as a synthesis of craft, research and spatial clarity. Based in London, the practice works across residential, cultural and educational projects, combining built work with academic engagement, including teaching roles at University of Greenwich and The Bartlett School of Architecture.

Their work reflects a consistent interest in material performance and environmental response, with a focus on natural materials and long-term durability. This project extends that trajectory, demonstrating how contemporary architecture can operate within historically sensitive contexts without resorting to mimicry or contrast.

Project Credit

Architect: Studio DERA / @studiodera_
Location: Belgravia, London, UK
Size: 524 sqm (85 sqm extension)
Completion: Summer 2025
Photo: Lorenzo Zandri / @lorenzozandri

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