A staircase punctured with rectangle-shaped holes is the focal point of this two-storey extension Grey Griffiths Architects has added to a workers' cottage in west London. More about Step House extension built around perforated birch-ply staircase
Architecture studio Atelier Dau has created an infill extension with a perforated bronze facade for the refurbishment of a heritage-listed building in Sydney. More about Atelier Dau adds kinetic bronze facade to Chimney House extension in Sydney
Architecture studio Morris + Company has designed an extension for the self-built home of Walter Segal in north London that is "a direct homage" to the architect's body of work. More about Morris + Company to extend Walter Segal's former London home
David Barr Architects has added a bright and roomy two-floor extension to a cottage near Perth, Australia so that its owners can have their grown-up children come to stay. More about Wood and white brick feature in Perth extension by David Barr Architects
Architecture practice Fraher & Findlay has renovated and extended a home in east London, adding a small courtyard that offers glimpses of old and new parts of the property. More about Tsubo House in Hackney features tiny Japanese-style courtyard
A slender-brick extension wraps around this semi-detached house in Cambridge, which has been renovated by Neil Dusheiko Architects to also include a charred-wood sauna and gym in the garden. More about Neil Dusheiko Architects contrasts pale-brick extension with charred-wood garden sauna
A half-arch window in this east London home extension by Yellow Cloud Studio offers glimpses of the older parts of the property. More about Yellow Cloud Studio punctuates Glyn House extension with arched window
San Francisco firms Síol Studios and Levy Art and Architecture have updated this house in the city's Noe Valley neighbourhood with a gridded glass extension and two rooftop decks. More about Black gridded windows form Valley Street house extension in San Francisco
Szczepaniak Astridge has added a rooftop extension to Leaf House, a terrace in south London for architectural photographer Edmund Sumner and writer Yuki Sumner. More about Szczepaniak Astridge focuses London loft extension on timber bath
Architecture studio Atelier Vens Vanbelle has built a Corten steel guesthouse with a watchtower in Uitbergen, Belgium, for a client in the film business. More about Atelier Vens Vanbelle tops cinematic guesthouse with watchtower
The two-floor extension that Studio Bright has added to this Edwardian family home in Melbourne includes fun features like a theatre-style sitting room and a pool that resembles a Roman bath. More about Studio Bright extends Ruckers Hill House to make room for rest and play
Perforated metal screens decorate this residential extension built by architecture studio Welsh + Major in a three-metre-wide gap next to a converted grain mill. More about Welsh + Major uses patterned window screens for residential extension in Sydney
Reflected greenery shrouds the mirrored extension that architecture practice Delavegacanolasso added to house in Madrid, which occupies a disused art studio. More about La Madriguera is a mirrored extension for a hidden house in Madrid
Architecture studio Alma-nac has extended and added a second grey-brick skin to a 1950s property in Brockley, south London to create a contemporary family home. More about Alma-nac wraps London home in brick to create House-within-a-House
Architect Lalo Carrillo worked with firms Colombo and Serboli Architecture and SY Arquitectos to design this guesthouse for his family in Córdoba, Argentina. More about El Quincho guesthouse in Córdoba is designed for asado and family gatherings
Architecture studio Smartvoll has preserved an old cottage in Klosterneuburg, Austria, enveloping it in three more buildings to create a spacious family home. More about Smartvoll builds timber-clad extensions around old cottage in Klosterneuburg
Boston firm Flavin Architects has built a three-storey addition for a house in Massachusetts to offer space for a couple to write, garden and repair antique scooters. More about Flavin Architects adds "creative sanctuary" Modern Lantern Studio to Massachusetts home
American firm Malcolm Davis Architecture has placed skylights over existing wood framing to streak the interiors of this San Francisco house with beams of light. More about Woodwork and skylights stream light into Noe Valley Residence in San Francisco
Oliver Chapman Architects has added a garden room to a house in Edinburgh, combining an Arts and Crafts approach with smart-home technologies. More about Oliver Chapman Architects combines technology and craft in Flitch House
Curved glass doors puncture the residential extension of this brick house in Montreal, designed by local studio TBA. More about TBA adds pale brick volume to traditional Montreal "shoebox" home