The project is located in the valley of Tumbaco - Quito on a land with some single-family constructions, its privileged view and the materiality of the project were the starting points for the conception of the B-Houses, called like that, because functionally they are almost twin, attached with each other to optimize the space of the land and planned on three floors to incorporate all the programmatic requirements to the interior. In order to reduce the carbon footprint that construction generates on the environment and, in order to optimize materials and minimize waste, it was proposed to pre-fabricate the metal structure, slabs and roofs in the workshop. This lower construction costs, optimize materials and drastically reduce assembly time and overall construction execution time. The project reveals in a very honest way its construction system and materiality, (both outside and inside). The B houses are built with exposed metal columns and beams painted in black, exposed brick walls, galvanized steel pipes for lighting, wood and metal for the stairs, plasterboard tiles only in certain ceiling places, which leaves in evidence the ceiling structure. For the client it was essential to have a social area integrated with the outside, so a covered porch was proposed that is directly related to the living room, dining room and kitchen, in addition to using large windows that are kept one behind the other, allowing the internal and external spaces unified in a single environment. The internal configuration of the ground floor is entirety open, giving a wider sensation of the space where the living room, dining room, study, kitchen, machines, social bathroom, porch and garden are resolved. The first upper floor in both houses is resolved differently. In the first one there is a small living room, the main bathroom, the main bedroom with a TV room divided only by sliding panels and a blackout curtain. In the second house, a small living room, the main bathroom, the master bedroom with a dressing room and a balcony. The houses ignore the morning sunlight and take advantage of all the afternoon sunlight, since all their spaces are arranged towards the west, from where the best views of the landscape are located.