Filipe Pina + Maria Inês Costa add concrete extension to stone house in Portugal
A glass-fronted stairwell joins a craggy stone Portuguese house to its new concrete extension by Filipe Pina + Maria Inês Costa (+ slideshow). More
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Bent Architecture's wooden extension screens a Melbourne home from neighbouring "McMansion"
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
Steel cladding frames an offset window at Montreal house extension by Naturehumaine
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
Lisbon apartment extended by Camarim Arquitectos to include an attic steam room
A marble-lined steam room is squeezed below the sloping ceiling of this apartment extension in Lisbon by local studio Camarim Arquitectos (+ slideshow). More
MX_SI's addition to the Serlachius Museum Gösta has a stripy facade based on an "abstract forest"
Spanish studio MX_SI added vertical wooden mullions to the exterior of this museum extension in Mänttä, Finland, to evoke the trunks of trees in the surrounding park (+ slideshow). More
Massimo Galeotti adds modern timber infill to the corner of an old Italian villa
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
Charred-timber extension by A1 Architects transforms an old cottage into a home and studio
A freestanding concrete staircase spirals between the floors of this timber-frame and stone building remodelled by the founders of A1 Architects to form their own home and studio in Prague (+ slideshow). More
ALA's Kuopio City Theatre extension features a crinkled facade
Crinkled fibre-cement panels clad the facade of this theatre extension by Finnish studio ALA Architects in the city of Kuopio, complementing the concrete exterior of the original 1960s building (+ slideshow). More
Atelier Data adds concrete volumes and internal courtyards to Algarve house
Atelier Data has extended a 1980s home in the Algarve, Portugal, with whitewashed concrete structures and fenced-in courtyards (+ slideshow). More
Giant sash windows cover the back of Panovscott's Sydney house extension
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
Norton Ellis extends Georgian basement flat with glass and brick "outhouses"
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
House W extension by Studio Prototype contrasts stripy cedar with original brickwork
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
Frei + Saarinen adds a zigzagging roof to a community centre extension in Switzerland
A zigzagging roof extends across this extension added to the original gable end of a community centre in the Swiss municipality of Oberglatt by Zurich studio Frei + Saarinen (+ slideshow). More
House Between the Two extension by Clément Bacle mirrors original house
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 add glazed extension to Grade II-listed Yew Tree House
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 sinks "invisible" extension into the garden of a London house
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
Simon Astridge opts for a variety of raw materials in Balham House extension
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
High-level windows funnel daylight into Skylight House extension by Andrew Burges
Skylights at the apex of a sloping roof project light onto the brick internal walls of this extension to a bungalow in Sydney, by local studio Andrew Burges Architects (+ slideshow) More
ADN Architectures adds V-shaped extension to Brussels bungalow
Belgian firm ADN Architectures gave this wooden house extension in Brussels a V-shaped roofline that inverts the pointed gables of the existing property (+ slideshow). More
Suppose Design Office adds double-height dining room to House in Chiba
Japanese firm Suppose Design Office has replaced the roof of a 35-year-old family house, creating a lofty new living room that opens to the garden at both ends (+ slideshow). More