SIERRA OBSERVATORY HOUSE

Hidden within the forests of Valle de Bravo, Sierra Observatory House frames the landscape below while turning its architecture towards the sky.

Set on a steep, densely wooded site outside Valle de Bravo, Sierra Observatory House is organised around two contrasting views: the forested valley below and the expansive night sky above. Rather than creating a single large residence, Taller Umbral divided the 738-square-metre house into a series of dark volcanic-stone volumes positioned between existing pine trees. Narrow glazed passages connect the structures, allowing the architecture to follow the natural slope while preserving much of the site’s vegetation. At the centre of the house is a circular observatory room. Partially embedded within the terrain, the space contains a retractable roof opening that frames the sky. During the day, a controlled beam of sunlight moves across the curved pigmented-concrete walls; at night, the room becomes a quiet space for viewing the stars. The primary living areas occupy the highest point of the site. Deeply recessed glazing opens towards the valley, while blackened-steel overhangs protect the interiors from direct afternoon sunlight. Inside, dark volcanic stone is balanced by Mexican walnut, lime plaster and restrained furniture in natural textiles. Bedrooms are distributed across separate volumes, each with a private terrace positioned among the trees. Thermal mass, cross-ventilation and planted roofs respond to Valle de Bravo’s changing mountain climate, while rainwater is collected and reused across the landscape. Sierra Observatory House is shaped by two scales of experience: the intimacy of moving through a dense forest and the vastness of looking beyond it into the night sky.