Architect Jochen Specht has doubled the size of a 1960s house in rural Austria by encasing its stone walls behind a new facade made up of dark timber, concrete and plenty of windows (+ slideshow). More
A curving copper-clad extension punctuated by portholes has been added to a house in Ghent, Belgium, by local studio Atelier Vens Vanbelle, who describe the structure as "a cocktail of science fiction and nostalgia" (+ slideshow). More
Wooden walls concertina across open-plan living areas to subdivide this renovated stone house and extension by Spanish office XLMS (+ slideshow). More
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Australian studio Philip Stejskal Architecture has equipped a white timber extension to a 1890s duplex with shutters and sliding panels that camouflage with the walls when closed. More
A large window wraps around one corner of this brickwork extension to a Victorian house in London by local office Cousins and Cousins (+ slideshow). More
The upper storey of this brick extension to a mid-century home in north London by Lipton Plant Architects projects over the entrance to form a porch (+ slideshow). More
Pale wooden window frames contrast with the black-stained cedar facades of this extension to a detached house in Nantes by French studio Bertin Bichet Architectes (+ slideshow). More
A glass-fronted stairwell joins a craggy stone Portuguese house to its new concrete extension by Filipe Pina + Maria Inês Costa (+ slideshow). More
The steeply angled roofs of a wooden pavilion and extension by Bent Architects will screen a family home in Australia from a "monster" development on an adjoining plot of land (+ slideshow). More
The street-facing elevation of this brick and steel extension to a 1920s Montreal property echoes the proportions of the original building, but at the rear a large angular outcrop projects over the back garden (+ slideshow). More
Italian studio Massimo Galeotti Architetto has filled in the empty corner of a house in Treviso with a timber-clad extension to provide space for a new music room (+ slideshow). More
Atelier Data has extended a 1980s home in the Algarve, Portugal, with whitewashed concrete structures and fenced-in courtyards (+ slideshow). More
Two oversized sash-style windows have been added to the back of this two-storey extension by Sydney architects Panovscott, allowing both levels to open up completely to the garden (+ slideshow). More
A strip of glazing cuts through the middle of this two-storey extension to a Georgian property in west London, by Norton Ellis architects (+ slideshow). More
This gabled extension to a brick house in the Netherlands was designed by Studio Prototype to mimic the shape of the original property but is clad in an entirely different material. More
This extension by French architect Clément Bacle mirrors the size and shape of the original brick house it adjoins, but uses modern materials to distinguish it as new (+ slideshow). More
Eastabrook Architects and Jonathan Tuckey Design have added a contemporary glazed extension to a Grade II-listed Cotswolds house to provide additional space without detracting from the original building (+ slideshow). More
Gianni Botsford Architects has added a subtle extension to a London townhouse, which is partly submerged in the garden and has transparent walls to help camouflage it from sight (+ slideshow). More
Architect Simon Astridge employed a varied material palette of plywood, concrete, brick and stone to create this extension to a Victorian terraced house in London (+ movie). More