San Francisco firm Schwartz and Architecture has overhauled a single-family home on a steep and narrow site, lifting the existing building to add a storey beneath it, and creating an extension at the back over three levels. More about Schwartz and Architecture overhauls San Francisco home with three-level extension
Rust-toned frames cover the facade of this extension to a central London home, which Gianni Botsford Architects designed to house its owner's private collection of photographs, prints and lithographs. More about Gianni Botsford Architects' Corten steel extension hosts private art collection in central London
Casey Hughes Architects has renovated and extended a 1950s house in Los Angeles, adding a tall metal-clad volume featuring a pair of high windows. More about Casey Hughes Architects adds twin-peaked extension to refurbished LA home
Canadian studio Aleph-Bau has overhauled an urban residence in Toronto, creating a bright white facade and adding a sculptural rooftop volume wrapped in aluminium. More about Aleph-Bau creates metal rooftop addition for slender Toronto townhouse
To subtly extend a traditional Provençal farmhouse on the French Riviera, Ellena Mehl Architects has nestled a connecting building with stone and glass facades into a stepped hillside. More about Ellena Mehl Architects disguises Provençal extension with grass roof and terraced landscape
Mulroy Architects has added a glazed extension to this house in north London, which features interiors and bespoke oak joinery by local studio Manea Kella. More about Mulroy Architects and Manea Kella extend Edwardian home in north London
Boston-based Stern McCafferty Architects has overhauled a country home in Massachusetts, transforming the layout to showcase a collection of art work and expand the living areas into a bright annex. More about Stern McCafferty Architects converts entrance of old Massachusetts house into a gallery
Vector Architects has renovated a house perched on a rocky peninsula in China's Fujian Province, adding a vaulted concrete roof that encloses a new living area with views towards the sea from either end. More about Vector Architects adds barrel-vaulted roof to refurbished house in Chinese port
This modest extension to a cottage in the Scottish countryside was designed by architecture studio Sutherland & Co so the owners could invite their family to stay. More about Gabled guesthouse by Sutherland & Co extends countryside cottage in Scotland
Glass doors are set into arched frames resembling a colonnade in this extension to a Victorian-era house in Birmingham, England, which Intervention Architecture designed for a choir singer. More about Colonnade-like glazing fronts Birmingham house extension by Intervention Architecture
During the renovation of an 18th-century home in Upstate New York, Manhattan-based Messana O'Rorke Architects has revitalised its original appearance and added modern conveniences in an extension clad in Corten steel. More about Messana O'Rorke Architects extends New York homestead with weathering-steel annex
Paris studio Dixneufcentquatrevingtsix has completed a concrete extension to a traditional farmhouse in France's Provence region, featuring very few openings in its faceted facades. More about Sculptural extension to French farmhouse protects its interiors from harsh summer sun
Timber portals frame windows and skylights in this garden-facing extension, which Nimtim Architects has added to a terraced house in Peckham, southeast London. More about Nimtim adds pergola-like extension to 1950s terrace in south London
Toronto firm Superkül has renovated a mid-century modern home in a residential area of the city, adding a second level dedicated to spaces for children. More about Superkül reserves upstairs just for kids at renovated modernist Toronto home
Australian architecture firm Panovscott has overhauled a federation-era cottage in Sydney, adding a stacked extension onto the rear of the building with large picture windows that overlook the garden. More about Stacked windows face a 116-year-old tree in Panovscott's Sydney cottage extension
Inbetween Architecture has renovated and extended a dated brown-brick property in Melbourne's Doncaster suburb to improve the quality of its living spaces and capture views of nearby Ruffey Lake. More about Inbetween Architecture transforms "terribly dated" 1970s Melbourne house to open up lake views
During the renovation of this Montreal home, local firm L McComber Architects reinterpreted its mock-Tudor facades with an expansion that echoes the architectural style. More about L McComber Architects gives contemporary update to Tudor-style home in Montreal
San Francisco architecture firm Spiegel Aihara Workshop has extended a 1930s hillside residence by duplicating its layout and stacking it over the original structure, raising the home so it looks over the city's landmarks. More about SAW inserts variation of an old San Francisco home into its roof
Chilean architect Gonzalo Claro has renovated a family home in Santiago, reducing the ground floor footprint but adding a level for bedrooms. More about Gonzalo Claro hides rooftop extension of Chilean house behind dark waterproof membrane
Architecture firm Zeller & Moye has outfitted an old residence with a sprawling rooftop garden, serving as a getaway within a crowded neighbourhood in the Mexican capital. More about Verdant garden with white marble paths tops renovated Mexican home by Zeller & Moye