Next up in our 2025 review, we take a look at the most popular residential extensions featured on Dezeen this year, from standalone annexes to loft extensions.
Among the top projects are a Corten steel-clad addition to a 1950s terraced home in London, and a concrete and timber annexe to a traditional barn in rural Switzerland.
Read on for Dezeen’s selection of the top home extensions of the year:
Photo by James Brittain
Quidhampton Mill House, UK, by Cooke Fawcett
A series of timber-clad additions were added to this Grade II-listed mill house in Hampshire, UK, which was updated by London studio Cooke Fawcett.
The project saw the existing brick home opened up to its surroundings through glazed openings, while a standalone studio annexe is complete with wood-lined spaces and large skylights.
Find out more about Quidhampton Mill House ›
Photo by Jim Stephenson
Elemental House, UK, by Archmongers
London studio Archmongers used red steelwork to frame the concrete dining room at Elemental House, a remodelled 1970s home in Hackney.
Looking to enhance the home’s existing layout, Archmongers expanded the kitchen and dining space into the concrete extension and added a new staircase finished in galvanised steel.
“The concept was simply to fully transform the house for modern living, using as few materials as possible,” studio founder Johan Hybschmann told Dezeen.
Find out more about Elemental House ›
Photo by Derek Swalwell
Mygunyah by the Circus, Australia, by Matt Gibson Architecture + Design
Also on the list of this year’s top extensions is the addition of two brick volumes to a 19th-century terraced house in Melbourne.
Designed by Australian studio Matt Gibson Architecture + Design, the contrasting extensions were added to the side and rear of a long, narrow home in North Fitzroy to double its area for its large family.
Find out more about Mygunyah by the Circus ›
Photo by Andrea Gatzke
Vejrhøj, Denmark, by Studio Marshall Blecher and Jan Henrik Jansen Arkitekter
A standalone extension was added beside an existing 1960s summerhouse in Denmark by architecture practices Studio Marshall Blecher and Jan Henrik Jansen Arkitekter.
Mimicking the design of the existing building, which was originally completed by Danish architect Ole Meyer in 1967, Vejrhøj is defined by a matching pitched volume topped with a thatched roof.
“Inspired by Meyer’s unrealised ideas, we embarked on a project to rebuild and reimagine Vejrhøj, balancing new regulations and construction standards with a deep respect for the integrity of the original design,” explained the team.
Photo by Rory Gardiner
The Wandering House, Switzerland, by Lionel Ballmer Architectes
Local studio Lionel Ballmer Architectes used concrete and timber to create this annexe to The Wandering House, a traditional barn in rural Switzerland.
The structure was designed to reference raised storage houses local to the area, with its concrete base perched on low feet, while the upper storey is clad externally in timber.
Find out more about The Wandering House ›
Photo by Markus Linderoth
House with a Hidden Atrium, Denmark, by Förstberg Ling
Swedish architecture studio Förstberg Ling used blackened pine to clad a cluster of volumes that make up the House with a Hidden Atrium in Denmark.
Spread across two storeys, the detached extension was created to provide additional living spaces to a 1950s cabin overlooking the sea in the village of Vedding, Zealand.
Find out more about House with a Hidden Atrium ›
Photo by Ellen Hancock
This colourful extension was completed by local studio Office S&M to replace a leaky conservatory at a Victorian home in London.
Designed for both its owners and their cats, the extension to Park House provides a dining and living space featuring a cat climbing frame and a cosy window seat.
“We created a landscape of soft seating that wraps around the kitchen and dining area, designed to meet the needs of both its human and feline residents,” Office S&M co-founder Catrina Stewart told Dezeen.
Find out more about Park House ›
Photo by French + Tye
Rusty House, UK, by Studio on the Rye
Another popular project this year was Rusty House, an extension to a 1950s terraced house in south London, clad entirely in rust-coloured Corten steel.
Completed by locally-based Studio on the Rye, the project introduces a two-storey side extension that matches its existing neighbour and almost doubles its size.
“The scale and form of the extension matches that of the host building, but the interpretation is modern, simple and monolithic, with shadow gaps in both the walls and roof helped delineate the extension from the original house,” studio director Sarah Borowiecka said.
Find out more about Rusty House ›
Photo by Richard Chivers
Hoj House, UK, by Studio Merlin
Neutral-toned concrete blocks were used for the exterior of this low-lying extension to Hoj House, a Victorian home in Stoke Newington, London.
The extension, completed by British architecture practice Studio Merlin, sits at the rear of a four-storey terraced home and expands its lower ground floor into the garden with an open-plan design.
Find out more about Hoj House ›
Photo by Taran Wilkhu
Lewisham Loggias, UK, by OEB Architects
London-based studio OEB Architects took cues from Italian palazzos and paintings for the colourful design of this loft extension in south London.
Finished with a pair of colonnaded bay windows with red and yellow details, the project adds an extra floor to the existing home, which is reached via a new staircase contained within a “zinc swoop”.
Find out more about Lewisham Loggias ›
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