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
TWO/BO Arquitectura and architect Luis Twose have converted a sixteenth-century Catalan house into a business academy for a pharmaceutical company. More about Grifols Academy by TWO/BO Arquitectura and Luis Twose
Italian architects EM2 have converted a castle into a mountain museum. More about Messner Mountain Museum Peoples by EM2
Spanish architects MX_SI have won a competition to design an extension to a Finnish museum of art with this proposal that features recessed zigzagging windows. More about Extension to the Serlachius Museum Gösta by MX_SI
Moss is expected to grow on the perforated aluminium skin of this museum extension in San Sebastián by Spanish studio Nieto Sobejano Arquitectos. More about San Telmo Museum Extension by Nieto Sobejano Arquitectos
Photographer Roland Halbe has sent us these images of an extension to a museum inside a ruined castle in Halle, Germany, by Spanish studio Nieto Sobejano Arquitectos. More about Moritzburg Museum Extension by Nieto Sobejano Arquitectos
French practice Moussafir Architectes have completed this refurbishment and extension of a house in the Parisian suburbs, adding deep larch wood window frames. More about Maison Leguay by Moussafir Architectes
Architects Ooze of Paris and Rotterdam extended this Rotterdam residence by wrapping a new faceted skin over the house's existing collection of buildings and extensions. More about Villa Rotterdam by Ooze
Portuguese firm A+R Arquitectos installed this staircase with floating wooden treads and a zig-zag hand rail as part of the renovation of a Portuguese house. More about PAC House by A+R Arquitectos
Argetinian studio Adamo-Faiden have installed a fabric tensile structure across the roof of this renovated apartment in Buenos Aires, Argentina. More about Núñez House by Adamo-Faiden
David Mikhail Architects won the New London Architecture's Don't Move, Improve! competition with this project extending a London terraced house by just one metre. More about Hoxton House by David Mikhail Architects
This extension to a family house with marble brise-soleils on the rear façade in New South Wales, Australia, is by Australian practice Carter Williamson Architects. More about Balmain House by Carter Williamson Architects
This extension to a mill-keeper's house on the Norfolk Broads by London studio Acme has been awarded the RIBA Manser Medal 2010 for the best new house in the UK. More about Hunsett Mill by Acme