“With the pleated roof we wanted to not only bring a graphic feel to the modern extension, but also to create a feeling of motion which would emphasise the meeting of old and new,” says Katerina Dionysopoulou, co-founder with Billy Mavropoulos, of Bureau de Change. The London firm, which recently designed the first bricks-and-mortar shop for design e-tailer Made, has just completed a stunning extension in a three-storey home.

Inside the period terrace house in North London, the main showpiece is the ceiling. Besides providing the actual structural component of the home’s side and rear extension, it lends drama to the kitchen area, where huge skylights visually connect the modern millwork of the interior with the old brick facade that can be viewed through the glazing. Floor-to-ceiling glass wraps the back of the extension to also provide views to Parkland Walk; meanwhile, the eccentric roof reads as flat from outdoors, keeping the home’s timeworn character intact.

The other interior features work together thanks to their rich tonal palette; the flooring alone is a tapestry of large terrazzo slabs, encaustic tiles and parquet. And the kitchen’s millwork and walls, in their faceted forms and duotone palette of white and deep blue, match the ceiling and make the extension a harmonious whole that is the sum of its well-considered parts.