Belsize Park House Extension

Architecture for London has designed a sustainable house extension and refurbishment for an 1850s semi-detached villa in Belsize Park, NW3.

The project, currently in the construction phase, will combine a two-storey rear extension with a comprehensive energy upgrade to create a contemporary, fossil fuel-free family home with improved living spaces and a refined material palette.

Design Concept

A two-storey rear extension improves family living space in both the raised ground-floor dining room, and the lower ground-floor reception rooms. The double-height space allows natural light to flood into the rooms at the rear of the house.

The concept for the internal finishes and materials is informed by the work of William Robert, a cubist painter who lived and painted locally. William was fascinated by colour, often using bold but natural, earthy tones. His pieces, The Tea Garden (1928) and The Playground (1930), have inspired a material palette of rich burgundy, light sandy tones and pale greens.
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Materials include natural red sandstone, Cipollino marble, Fior di Bosco, sapele, oak and London plane, bringing warmth and tactility to this early Victorian house.

Sustainability

The property is insulated internally with a combination of wood fibre and aerogel, improving the thermal performance of the original solid brick walls, whilst minimising loss of internal area.

The house is fossil fuel-free, with both space heating and hot water demand met by an air-source heat pump. A photovoltaic panel array and storage battery provide renewable electricity. An MVHR system supplies fresh, filtered air throughout the house, improving comfort and indoor air quality.

Interior Design

The interiors feature bespoke furniture, combined with mid-20th century pieces. In the kitchen, the bespoke table and bench seat is accompanied by Hay Rey chairs. The bench is carved from solid timber, with a curved seat back that highlights the decorative end grain.

Double-height, translucent s-wave Kvadrat curtains visually soften the metal-framed glazing to the rear extension. Curtains, rugs and other fabrics also provide acoustic dampening in the lower ground floor, a space that is predominantly finished in brick and stone. Here, furniture includes 1929 LC1 chairs by Le Corbusier, a Pierre Yovanovitch ‘Arthur’ sofa, and a bespoke stainless steel coffee table.

Lighting is by Ingo Maurer, Akari, Hans Verstuyft Architects and Muller Van Severen. Paintings are by William Robert, tying the interior palette back to the original artistic inspiration.

If you are seeking architects in Belsize Park, contact us to arrange a free consultation to discuss your house extension, refurbishment or interior design project.

Project Information

Project Architect:
Ben Ridley

Location:
Belsize Park, NW3

Project Type:
House extension and refurbishment

Visualisations:
Tom Groves

Belsize Park house modern extension design with open plan dining room and kitchen
Belsize Park house extension kitchen design with natural stone worktops and oak cabinets and lime plaster with sheer curtain
Belsize Park house extension kitchen, detail of stone sink and downdraft hob
Belsize Park house extension - architect designed two storey glass extension with curtains and fireplace
Belsize Park house interior design with red stone, brick floor, cream rug and mid century modern chairs
Belsize Park house master bedroom design with green marble, bespoke bed, dressing table and victorian sash windows
Belsize Park house bathroom ensuite with green marble, and bespoke stone basin
Belsize Park house extension, kitchen detail showing volt tap, stone basin, lime plaster walls and wooden chopping board