Bairro Alto (Upper District) is a central district of the city of Lisbon, the Portuguese capital. Unlike many of the civil parishes of Lisbon, this region can be commonly explained as a loose association of neighbourhoods, with no formal local political authority but social and historical significance to the urban community of Lisbon. The bairro or “neighbourhood” resulted from urban expansion in the 16th century, forming outside the walls of the historical city, and is characterized by an almost orthogonal tract (developing from two phases of distinct urbanization).
It is a fundamental quarter of Lisbon, organized into a hierarchical scheme of roads and lanes: the roads, the structural axis, run perpendicular to the river; and the lanes, or secondary axis, cut parallel to the river. The matrix of allotments reflects the persistent use of the medieval layout; the division and multiplication of this module had its origin in the variations of the architectural typology. The space constructed is dominated by living spaces implanted in long narrow lots, of three- to four-storeys in height, with asymmetric facades consisting of windows along the various storeys and staircases along the lateral flanks. Although less representative, the Pombaline-era buildings are common, essentially introducing modifications to the level of the façade’s composition. Although there are many typological variations to the facade designs, certain elements are repeated, such as the corners, bay and sill windows, eaves and attics, securing a homogeneous urbanized front.
In addition to being formed in an orthogonal layout, the construction in the Bairro Alto used new construction techniques for the time: the transition from buildings built in wood to those completed in stone masonry. The older homes in the bairro, dating from the 16th and 17th centuries are characteristically two types: low buildings with two storeys (ground and first floor), square, asymmetric with small windows and sills; and buildings that were long and narrow, consisting of three floors with windows, balconies and aligned spans. The first type, from the rural architectural tradition, were generally substituted for the second (which allowed a higher rate of occupation), with examples surviving to this day. The second type, which are more common, are, nonetheless, infrequent (with the exception existing along the Rua da Atalaia. From the natural typological evolution, and growth in the resident population during the 17th century, each of these types served the necessities of its inhabitants, and as a result, there were alterations to the layouts and façades over time. Although the 1755 earthquake did not result in great damage to the Bairro, there are examples of Pombaline-era frame system employed in some of these buildings. The Pombaline building of the period is characterized by a four-storey block with differentiated windows. The façade is recognized by a symmetry made possible by a central staircase, with two opposite sets, and the windows in the mansard roofs. By the beginning of the 19th century, the Pombaline style gave way to a simplification and enhancement of the Pombaline-era buildings.
While, generally, the gaioleiro-style reinforcement of the buildings is not common, many of the Pombaline buildings were redesigned in keeping with the design aesthetic of the time. The construction of palacettes in this Romanticism style, resulted from a collage of the French aesthetic influences, identified primarily in the north and east of Bairro Alto, and especially in the area of São Pedro de Alcântara, where the Palacete Laranjeiras is the best example. This was a period that emphasized the façade of the buildings, with large verandas. They present a strong characteristic of the façade, with protruding balconies, fine gratings, frame spans over worked masonry and the application of curved lines, especially in the design of courtyards and windows along street corners. At the same time, some buildings were constructed to house workers, organized into villages or in courtyards, such as the Pátio do Tijolo (literally, the Yard of Bricks). These were multi-family buildings, usually two to three storeys in height, with a high occupancy and little space. Architectural influences from the 20th century are limited, and restricted to a few points.
