Bureau de Change is an award-winning architecture practice founded by Katerina Dionysopoulou and Billy Mavropoulos, who hailed from Greece and met while training as young architects working at Foster + Partners.

Projects by Bureau de Change are a direct product of the founders’ upbringing, passions, and experiences – combining the pragmatism and formality of their architectural training with a desire to bring a sense of theatre, playfulness and innovation to the design of spaces, products and environments. The result is a studio where rigorous thinking and analysis are brought to life through prototyping, testing, and making along with collaborations with fabricators. Billy and Katerina combine practice with teaching, leading an undergraduate unit at The Bartlett School of Architecture, UCL.

The practice is celebrated for its highly inventive and playful private residences, embracing the three-dimensionality of architectural gestures in creating unprecedented forms. Each project is curated to respond to specific briefs — creating dialogues and narratives between the existing and the proposed through materials, forms, and light — including the Folds House, Haringey (2015); Step House, Hampstead (2018), and Frame House, Clapham (2020); the Long House, Cotswolds (2020), and the Pavilion House, Stoke Newington (2022). Richly textured mixed-use projects such as The Interlock, Fitzrovia (2019), and commercial projects such as The Gaslight, Fitzrovia (2020), present themselves in the city as sensitive newfound addition to its immediate context.

The studio works closely with fabricators to innovate; as demonstrated in the bronze metal installation in the circulation core of The Gaslight, made in collaboration with John Desmond, and the brickwork for The Interlock, developed with Forterra.

The practice has won numerous awards, including FX Breakthrough Talent of the Year 2016 and The Sunday Times Architect of the Year Award 2019, and was most recently shortlisted for the RIBA Awards 2022.