Local firm FABG has made major improvements to the Musée d'art de Joliette outside Montreal, restoring the original building and adding three new volumes to the museum (+ slideshow). More about FABG renovates and expands Quebec's Musée d'art de Joliette
Porto studio NPS Arquitectos has renovated a pair of matching townhouses and added a contemporary linking building to create a new headquarters for the Portuguese Architectural Association (+ slideshow). More about Portuguese Architectural Association takes over two revamped townhouses
Panes of transparent and translucent glass create a gridded facade for this photography museum in Albania by Dutch studio Casanova + Hernandez Architects (+ slideshow). More about Albanian photography museum by Casanova + Hernandez features gridded glass walls
Australian architect Christopher Polly has added an asymmetric extension to an early 20th-century house in Sydney, creating a bright double-height living space filled with Modernist furniture (+ slideshow). More about Wedge-shaped reading and sleeping nooks feature in Christopher Polly's Sydney extension
Fraher Architects has added a simple extension with a sloping glass roof to an early 19th-century house in London, creating a bright new dining area that opens onto a garden patio (+ slideshow). More about Fraher Architects adds glass-roofed extension to terraced house in London
Tate Modern has released a time-lapse movie showing the building of Herzog & de Meuron's Switch House extension, which has already attracted record visitor numbers (+ movie). More about Tate Modern releases movie showing construction of Herzog & de Meuron's extension
These new images by British photographer Jim Stephenson offer a look around Herzog & de Meuron's extension to Tate Modern in London, which officially opened on Friday (+ slideshow). More about Tate Modern Switch House by Herzog & de Meuron opens to the public
Hammerschmid Pachl Seebacher Architekten has added a contemporary extension to a traditional farmhouse in Austria, featuring rough-sawn spruce cladding and a folded fibre-cement roof (+ slideshow). More about Traditional farmhouse in Austria updated with contemporary extension
A 1960s-inspired window wall fronts this extension to a psychiatric institute in Paris by Local firm Atelier 2+1 (+ slideshow). More about Atelier 2+1 adds glazed extension to Parisian psychiatric hospital
This set of images by photographer Iwan Baan provides a first look inside Herzog & de Meuron's extension to the Tate Modern art gallery, set to open next month in London (+ slideshow). More about Tate Modern releases first images of Herzog & de Meuron's Switch House extension
This tall, gabled extension is tucked behind the Victorian frontage of a mid-terrace house in Melbourne's Fitzroy North suburb, and its exterior is clad in pale blue tiles (+ slideshow). More about Pastel blue tiles front gabled extension to a Melbourne house by Dan Gayfer Design
A three-metre-high pivoting glass door protrudes from the sloping roof of this London house extension, which is clad in fibre-cement panels to match a refurbished dormer window (+ slideshow). More about Alma-nac creates huge pivoting door for London house extension
Architect Sean Griffiths has unveiled plans to add a shed-inspired roof extension to the Blue House, one of the best-known projects of his former studio FAT. More about FAT's seminal Blue House set for rooftop extension
Local studio Naturehumaine has created an angular addition to a historic dwelling in Montreal, featuring dark zinc cladding that references works created by the owner, a graphite pencil artist (+ slideshow). More about Naturehumaine adds zinc-clad extension to 19th-century home in Montreal
Link Arkitektur has added a gabled extension to a 19th-century Norwegian farmhouse, featuring a wooden facade designed to age with the building (+ slideshow). More about Link Arkitektur extends Norwegian farmhouse with contemporary gabled structure
Australian firm CM Studio has added a pair of white-painted extensions to an end-of-terrace house in Sydney dating back to the 1880s, and remodelled its interiors with grey marble and pale timber finishes (+ slideshow). More about CM Studio updates 19th-century workers' cottage in Sydney with slatted timber extension
Spanish studio H Arquitectes has renovated and extended a tired mid-century school building in Catalonia, adding a new facade of concrete blocks and slatted screens (+ slideshow). More about H Arquitectes upgrades 1950s school building in Spain with a new facade
Nordic firm AART has won a competition to extend the Viking Age Museum building in Oslo, with plans to add a new curving wing to the cruciform plan (+ slideshow). More about AART to add looping extension to Oslo Viking museum
Bennetts Associates has extended a historic theatre in London's West End, adding a serrated box made from weathering steel on top of the roof (+ slideshow). More about Bennetts Associates adds pre-rusted steel box to London's Shaftesbury Theatre
GKMP Architects has extended a 1930s residence in Dublin, Ireland, using the same material palette – which even includes pebbledash. More about GKMP Architects uses pebbledash, brick and slate for Dublin house extension