House transformation, night view: modern two-storied glazed wall thanks to a cellar conversion and garden excavation. Highgate, North Londonn

A glass extension and knocking down inner walls creates a bright modern open-plan space out of a dark many-roomed mews house. Primrose Hill, North London

Flat extension: adding space with a basement extension and a conservatory. West Hampstead, London

Mews conversion: creating a bright open plan contemporary home from an old rental property. Paddington, London

Glass home development: lowering the boundaries between inside and outside. Gardeners Hill, Surrey