Designed in Hackney: it's week four in our celebration of design from the London borough of Hackney and today's featured project is a modest glass extension to a house in Dalston by Shoreditch-based architects Platform 5. More about Designed in Hackney: Mapledene Road by Platform 5 Architects
Slideshow: the faceted copper envelope of this house extension near Sydney was designed by architects Innovarchi to resemble a roof. More about Balmain Archive by Innovarchi
Slideshow: German architects Schneider+Schumacher have completed an underground gallery that creates a bulge beneath the lawn of the Staedel Museum in Frankfurt. More about Staedel Museum extension by Schneider+Schumacher
The two storeys that London architects Project Orange have added to the roof of a redundant brick warehouse in Sheffield look like another building stacked on top. More about 192 Shoreham Street by Project Orange
A 1960’s bungalow in Cambridgeshire is hidden behind a Siberian larch-clad extension with a row of gabled roofs. More about The Lanes by Mole Architects
English architects Designscape have reversed the orientation of a country house in Bath by adding a prominent glazed entrance to its rear. More about The Fosse by Designscape Architects
A single-storey studio at the bottom of the garden of a semi-detached house in London creates a separation between work and domestic life for its residents. More about Suburban Studio by Ashton Porter Architects
London architects Gundry & Ducker have added a blackened larch extension onto the rear of a Victorian terrace in south London. More about Dove House by Gundry & Ducker
Climbing plants grow in the recesses of this mysterious steel fence, which conceals the entrance to a renovated coach house in north London. More about Murray Mews by Moxon Architects
Innsbruck architect Daniel Fügenschuh has completed a concrete and glass extension to a school at a former monastery in Rattenberg, Tyrol. More about Hauptschule Rattenberg by Daniel Fügenschuh
A frameless sheet of glass undulates around this barrel-vaulted conservatory in west London. More about The Glass Wave by Andy Martin Associates
Architect Renzo Piano has completed a new wing at the Isabella Stewart Gardner Museum in Boston, which opens next week. More about Isabella Stewart Gardner Museum extension by Renzo Piano
Cavernous holes in the courtyard of three museum buildings in Graz, Austria, lead underground into a new, shared entrance by Spanish architects Nieto Sobejano and local firm eep architekten (photographs by Roland Halbe). More about Joanneum Museum extension by Nieto Sobejano Arquitectos and eep architekten
This extension to a north London home comprises three shed-like blocks clad in unfinished larch. More about Timber Fin House by Neil Dusheiko
Dutch architect Erick van Egeraat has completed an underground museum extension with a park on top in Assen, the Netherlands. More about Drents Museum by Erick van Egeraat
One half of an extension to a house in north London is surrounded by frameless glass, whilst the other half is encased in slatted timber. More about Duncan Terrace by DOSarchitects
London-based Fraher Architects have completed a house extension in Islington that is wrapped in larch batons and has a flower-covered roof. More about The Jewel Box by Fraher Architects
French studio CUT Architectures have extended a Paris house by squeezing a glass-fronted music room and a garage between the building and its neighbour. More about Extension to a house in Chaville by CUT Architectures
A veil of metal lace screened by thin concrete piers clads an extension to a baroque theatre and an adjacent commercial block in Germany. More about Elsbethen Site by Trint + Kreuder d.n.a
German studio Archifaktur has inserted felt-lined caves and green-floored playrooms into the loft of a 1930s primary school (photographs by Zooey Braun). More about Alte Schule Winterbach by Archifaktur