A sloped section of roof joins this timber-clad extension by Melbourne studio Julie Firkin Architects to the adjacent weatherboard house (+ slideshow). More about Triangular void connects a two-storey timber extension to a Melbourne bungalow
A glass wall spotted with reflective yellow and orange windows creates a false facade for this extension to a secondary school in south-west Germany, designed by Netzwerk Architekten (+ slideshow). More about Translucent and foiled glass fronts German grammar school extension
A cylindrical tower clad in weathered steel forms part of this extension to a 19th-century stone cottage in the English countryside, designed to recall a gasworks that previously stood on the site. More about Chris Dyson Architects adds a rusty steel tower to a rural stone cottage
A living room is contained within this glazed extension to a period property in Dublin, forming a transparent connection between the existing building and its garden. More about Glazed house extension by GKMP Architects "feels like part of the garden"
Australian studio Mihaly Slocombe has returned to a Melbourne home it completed almost a decade ago to add a timber nursery annex patterned with circular cutouts (+ slideshow). More about Mihaly Slocombe extends vineyard home in Australia with wooden nursery
This extension to a Victorian house in London features a decorative wooden ceiling, exposed brickwork and a dining space that opens out to a garden filled with bushy plants (+ slideshow). More about Gort Scott adds timber-framed extension to 19th century Victoria Park house
A triangular lightwell covered in scale-like shingles extends from the roof of this living room that architect Nuno Melo Sousa has added to a house in Penafiel, Portugal (+ slideshow). More about Nuno Melo Sousa uses a wedge-shaped lightwell to bring light into a courtyard living room
A black box looms over the rusty steel facade of this complex of artists' studios and apartments, created by architecture studio Featherstone Young on the former site of a board-game factory in north London (+ slideshow). More about Featherstone Young replaces board-game factory with apartments and artists' studios
Irish studio NOJI Architects experimented with plywood to create the three different kinds of structure that frame this extension to a terraced house in Dublin. More about Plywood frames create a pattern of triangles inside house extension by NOJI Architects
The Whitworth gallery in Manchester has reopened following an extensive renovation by London architecture studio MUMA that included the addition of two new glass and brick gallery wings (+ slideshow). More about MUMA unveils glass and brick extensions to Manchester's Whitworth gallery
Forming a new end to a 1960s housing estate in London, this timber-framed house extension was designed to look contemporary but also to match the aesthetic of the original block (+ slideshow). More about Maccreanor Lavington extends a 1960s London housing estate with a modern interpretation
Architecture studio Lipton Plant has turned a small space at the side of a Victorian house in north London into the glazed entrance for a basement extension focused around an oak staircase (+ slideshow). More about Lipton Plant creates a nanny flat underneath a London home
These four "finger-like" extensions to a Vienna restaurant, by PPAG Architects, feature mirrored walls that reflect the surrounding parkland, and windows that slide up above the roof (+ slideshow). More about PPAG Architects adds mirrored extension to restaurant in Vienna's Stadtpark
Hexagonal slate tiles cover this extension to a west London home designed by architects Christian Ducker and Tyeth Gundry to create a bright and spacious new kitchen (+ slideshow). More about Gundry and Ducker's Slate House is an extension clad with hexagonal tiles
This rust-coloured copper home extension by British studio Poulsom Middlehurst sits above the red-brick walls and clay-tiled roof of a Victorian terrace in east London. More about Poulsom Middlehurst adds copper-clad extension to east London attic flat
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 about Jochen Specht envelops a 1960s house in a new timber and concrete facade
Wooden walls concertina across open-plan living areas to subdivide this renovated stone house and extension by Spanish office XLMS (+ slideshow). More about XLMS extends 19th-century stone house in Mallorca to create a holiday home
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 about House by Philip Stejskal can be "locked down" with shutters that blend into the facade
Hundreds of tiny holes puncture the white concrete panels that clad these two extensions to the Badajoz Fine Arts Museum by Spanish firm Estudio Arquitectura Hago (+ slideshow). More about Badajoz Fine Arts Museum extensions feature speckled walls and bevelled edges
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 about London house extension by Cousins and Cousins has a window wrapping its corner