A glossy black marble wall divides the glass facade of this extension to a 19th-century townhouse in north London by local architecture office Paul Archer Design (+ slideshow). More about Paul Archer Design pairs glass with marble for extension to a remodelled London townhouse
Square windows and a matching door puncture the dark brick facade of this extension to a 1920s house in a Sydney suburb, designed by local office Tribe Studio (+ slideshow). More about Tribe Studio adds contemporary brick extension to a 1920s Sydney bungalow
This glass-fronted living room and surrounding garden have been added by New South Wales firm CO-AP on the rooftop of a house in Sydney's Darlinghurst (+ slideshow). More about CO-AP creates rooftop oasis for residents of a Sydney penthouse
The green finish applied to the metal cladding of this police station extension in Italy resembles oxidised copper, but also aims to evoke the "power and invincibility" of The Incredible Hulk (+ slideshow). More about Maurizio Bradaschia adds green-painted extension to an Italian police station
This Vietnam house extension cantilevers off the edge of a stone plinth, protecting the rooms inside from annual flooding (+ slideshow). More about Nha4 Architects adds flood-proof extension to family home in Vietnam
Swedish firms Johan Sundberg Arkitektur and Blasberg Andréasson Arkitekter used sheets of perforated metal to create a faceted facade for this office extension on a Lund industrial estate, helping to "break up the area's mediocrity" (+ slideshow). More about Perforated metal sheets concertina across the facade of an office extension in Lund
Marlene Uldschmidt's extension to an old farmhouse in Portugal's Algarve region features windows that cover entire walls and a paved rooftop promenade that affords views of the rural landscape (+ slideshow). More about Walkway extends over rooftop of Algarve farmhouse extension by Marlene Uldschmidt
Australian architect Matt Gibson took cues from the designs of European Modernists for this pair of extensions he has added to the rear of a Victorian-era residence in Melbourne (+ slideshow). More about Matt Gibson adds Modernist-inspired extension to a Victorian home in Melbourne
A brick water tower now stands at the entrance to this 1980s bungalow in Santa Fe, Argentina, which has been remodelled and extended by local firm Biagioni Pecorari Arquitectos (+ slideshow). More about Biagioni Pecorari adds brick water tower to remodelled house in Argentina
Australian firm Cox Architecture has extended a house in the capital city, Canberra, with a lightweight glass and steel conservatory (+ slideshow). More about Cox Architecture adds steel and glass conservatory to 1920s house in Canberra
Architect Christian Froggatt has added a frameless glass and timber extension to the side of his 1950s home in Reigate, England, to house the offices of his expanding studio. More about CF Architects builds its own timber and glass office on the side of a mid-century home
This white concrete extension has been added to the roof of an old apartment block in the Austrian city of Innsbruck, providing extra rooms and a roof terrace with panoramic views (+ slideshow). More about Daniel Fügenschuh adds white concrete loft to a 20th-century apartment block in Austria
This artists' home in Dalston has been updated with a yellow-framed kitchen extension in the back garden and a traditional glass and timber "shopfront". More about PriceGore adds a yellow-framed extension to an east-London artist's home
The two elongated wings that make up this extension to an Australian farmhouse are set into the side of a hill, connected by a stairwell that offer views straight through its middle (+ slideshow). More about Honeyman + Smith Architects adds a hillside-hugging extension to an Australian farmhouse
Singapore-based Ministry of Design has used a 100-year-old colonial building in Malaysia as a "cookie cutter" for a contemporary extension featuring the same profile and materials (+ slideshow). More about Ministry of Design adds contemporary extension to century-old Malaysian heritage building
A concrete floor merges with seating inside and outside this rusted steel and glass extension to a Victorian-style house in west London, designed by local architecture studio McLaren Excell (+ slideshow). More about McLaren Excell adds a weathered-steel and concrete extension to a London house
A doll's house provided the inspiration for this extension to a house outside Melbourne, which features a gabled profile, a simple gridded layout and a transparent rear facade (+ slideshow). More about Gabled extension by BKK Architects borrows the form of a doll's house
Paris studio CUT Architectures has returned to the house it extended in 2011 to create a glazed study featuring a yellow staircase that integrates a desk (+ slideshow). More about CUT Architectures adds a second concrete-framed extension to a French home
Rotterdam architect Antonia Reif has renovated and extended a modest 1960s bungalow, creating a two-storey living room and a generous bedroom that both open out to the garden (+ slideshow). More about Antonia Reif adds an inconspicuous extension to a 1960s Rotterdam bungalow
A sliver of glazing stretches all the way up from the ground to the roof of this extension to a west London house, which is named The Lantern in reference to the way it glows at night (+ slideshow). More about Fraher Architects completes an extension with a window that stretches up to the roof