Located in North London, UK, the Hampstead House Extension project by Architecture for London transforms a five-storey Victorian property into a contemporary home while respecting its position within the South Hill Park Conservation area. The existing residence already boasted an idyllic setting, with the rear garden connecting directly to the expansive Hampstead Heath. The challenge for the architects was to enhance the connection to this stunning natural environment by reworking an existing rear extension, approximately 22 square metres in size, without requiring a complete rebuild.
The architectural solution focused on maximizing light and views. The design introduces larger openings in the rear elevation and more effectively positioned, rationalised roof lights. These interventions successfully increase the outlook onto the sky, garden, and the surrounding Hampstead Heath. Despite the property’s location within a Conservation area, the project was notably carried out under permitted development, circumventing the need for full planning consent.
A significant part of the overhaul involved simplifying the extension’s structure, which had been over-designed with deep beams and four substantial internal columns. The structure was rationalised, ultimately leaving only a single internal column. This structural rationalisation was key to creating a more flexible internal space, which in turn allowed for the successful insertion of the larger roof lights.
The materials palette selected for the contemporary extension is rich and tactile, including brick, limestone, clay, and plaster. Externally, the new brickwork is carefully chosen to be similar in tone to the original Victorian house. A colour-matched mortar was then used with the new bricks to provide a more visually uniform surface.
Inside the Hampstead House extension, the finishes showcase a commitment to natural textures and high-quality fittings. Internal surfaces are completed with Clayworks render and Bauwerk textured paint. A new DeVOL kitchen anchors the space and is fully complemented by high-end modern appliances from respected brands like Bora, Miele, and Liebherr. The project architect for this thoughtful renovation was Victoria Havercroft.
Beyond aesthetics, the project prioritizes sustainable design and comfort. The thermal performance of both the walls and roof was significantly improved through the addition of new insulation. This is further enhanced by high-performance glazed doors and the new roof lights, ensuring the home is warm and low-energy. Architecture for London, led by Passivhaus designer Ben Ridley, is dedicated to creating healthy, breathable buildings with natural materials, consistently aiming for the highest sustainability and comfort standards.