Located in Rio de Janeiro, a new compact leisure annex has taken shape at the site of an original Oscar Niemeyer house. Designed by firm Siqueira + Azul Arquitetura, the project was formed through the acquisition of the next-door property, resulting in an expansion of the existing residence.

Called Itaúna House, the approximately 8,611-square-foot annex appears to hover between the pool and garden. It was developed as three independent constructions and is fully interconnected by pathways, walkways, and stairs.

The façades of the main existing blocks feature large pivoting panels, allowing for a seamless transition between the indoor and outdoor spaces. These function through a custom structural scheme in an iron square mesh.

The project also features a circular oculus that provides views to the courtyard, while inviting natural light inside. The annex is crowned by a tower element with large sliding glass panels. This is accessed by a distinctive helical staircase.

Itaúna House is composed of natural materials, such as stone and concrete, which highlight contrasts while maintaining aesthetic continuity throughout the home.