Atelier Data has extended a 1980s home in the Algarve, Portugal, with whitewashed concrete structures and fenced-in courtyards (+ slideshow). More about Atelier Data adds concrete volumes and internal courtyards to Algarve house
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 about Giant sash windows cover the back of Panovscott's Sydney house extension
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 about Norton Ellis extends Georgian basement flat with glass and brick "outhouses"
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 about House W extension by Studio Prototype contrasts stripy cedar with original brickwork
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 about Frei + Saarinen adds a zigzagging roof to a community centre extension in Switzerland
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 about House Between the Two extension by Clément Bacle mirrors original 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 about Eastabrook Architects and Jonathan Tuckey Design add glazed extension to Grade II-listed Yew Tree 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 about Gianni Botsford sinks "invisible" extension into the garden of a London house
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 about Simon Astridge opts for a variety of raw materials in Balham House extension
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 about High-level windows funnel daylight into Skylight House extension by Andrew Burges
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 about ADN Architectures adds V-shaped extension to Brussels bungalow
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 about Suppose Design Office adds double-height dining room to House in Chiba
This London house extension by Tigg Coll Architects features sliding glass doors that retract into the brick walls to open the space up to the garden (+ slideshow). More about Glazing disappears into the walls of Tigg Coll's Malbrook Road extension
Jonathan Tuckey Design has refurbished the interior of a semi-detached house in London and added a dining room extension with a latticed wooden ceiling (+ slideshow). More about Doyle Gardens extension by Jonathan Tuckey features a criss-crossing wooden ceiling
After 15 years of incremental work, architect Niall McLaughlin has restored and extended a London house with a subterranean gallery (+ slideshow). More about Niall McLaughlin extends Duncan Terrace house with translucent passageway and gallery
UK architecture firm 5th Studio has added a shingle-clad extension to a house in a listed former inn that is raised above the flood level of the River Cam in Cambridgeshire (+ slideshow). More about Wildfowl Cottage extension by 5th Studio is clad with shingles and raised over a flood plain
This house extension in Melbourne by local studio Kennedy Nolan Architects is separated from the rest of the Edwardian property by a wall with a circular hole that children can climb through (+ slideshow). More about Punctured wall separates old from new at Westgarth House by Kennedy Nolan
Irish firm Donal Colfer Architects has renovated a Victorian terraced house in Dublin, adding an extension with a glazed ground floor and concrete mullions above (+ slideshow). More about Donal Colfer Architects adds concrete and glass extension to Dublin residence
The extension to this refurbished house in Australia includes a covered outdoor space built around the trunk of a large lemon-scented tree (+ slideshow). More about B.E. Architecture designs Sydney house extension around mature gum tree
A thin metal staircase provides access to the renovated attic space of this house in Belgium by Kortrijk design studio Five AM (+ slideshow). More about Delicate staircase leads to Isle of Water attic extension by Five AM