Architecture firm Estúdio 41 has designed this small, white house in Brazil to be highly sustainable, including photovoltaic panels, a green roof and a rainwater collection system.
Hauer House is located in Curitiba in southern Brazil. The project is named after its location in the city's Hauer district ? a former industrial zone that has transitioned to a residential neighbourhood.

The main goal for the project was to create an "economically and environmentally correct building" that would be easy to maintain. Providing ample outdoor space was also important.
In response, the team conceived a 119-square-metre, single-storey dwelling, which takes up just half of the rectangular property. The remainder of the site is turned over to outdoor areas.
"A house with minimal programme was expected to make the building feasible financially, while also freeing up outside space," said local firm Estúdio 41 in a project description.
The low-lying house is L-shaped in plan, with rectilinear bars organised around a courtyard. Situated off the courtyard is a staircase comprising cantilevered, concrete steps, which leads up to a rooftop garden.

White-painted walls are made of concrete blocks, which helped keep costs down. The building's foundation ? which features piles driven deep into the ground ? responds to fragile soil conditions and a shallow water table.

A verdant lawn is set to the front of the residence and bisected by a tall fence made of perforated met...