Continuing our 2025 review, we explore the most celebrated residential extensions featured on Dezeen this year, ranging from detached annexes to innovative loft conversions.
Highlights among these projects include a striking Corten steel-clad extension to a mid-century terraced house in London, and a concrete and timber annexe complementing a traditional barn in rural Switzerland.
Discover Dezeen’s curated selection of the year’s standout home extensions below:
Quidhampton Mill House, UK, by Cooke Fawcett
London-based studio Cooke Fawcett introduced a series of timber-clad extensions to this Grade II-listed mill house in Hampshire, enhancing the existing brick structure.
The renovation opened the home to its natural surroundings with new glazed openings. A separate studio annexe features interiors lined with wood and illuminated by generous skylights.
Find out more about Quidhampton Mill House ›
Elemental House, UK, by Archmongers
For Elemental House in Hackney, London studio Archmongers introduced bold red steelwork to frame a new concrete dining area within a renovated 1970s home.
To improve the spatial flow, the architects extended the kitchen and dining zones into a concrete addition, while a new staircase with a galvanised steel finish connects the updated spaces.
“The concept was simply to fully transform the house for modern living, using as few materials as possible,” explained studio founder Johan Hybschmann to Dezeen.
Find out more about Elemental House ›
Mygunyah by the Circus, Australia, by Matt Gibson Architecture + Design
Another notable extension this year is the addition of two distinct brick volumes to a 19th-century terraced residence in Melbourne.
Designed by Matt Gibson Architecture + Design, the project introduces contrasting extensions to both the side and rear of a narrow North Fitzroy home, effectively doubling the living space for a large family.
Find out more about Mygunyah by the Circus ›
