1755 onward
Pombalino reconstruction
Braced timber cage, the gaiola pombalina, running in three dimensions inside masonry walls. Internal frontais and tabiques carry lateral load. No national building regulation exists yet.
1890 to 1930
Gaioleiro expansion
Taller buildings, commonly five or six floors. Unreinforced masonry with weak lime mortars and timber floors. The timber cage thins out or disappears without replacement.
7 August 1951Regulation
RGEU enters force
Decreto-Lei n.º 38382 approves the Regulamento Geral das Edificações Urbanas, the first general national building regulation. It remains in force. Buildings completed earlier are treated differently for licensing.
1958Regulation
Seismic-protection legislation approved
68% of the buildings in the Área Metropolitana de Lisboa predate it (Público, February 2023).
1940 to 1970
The placa transition
Reinforced concrete floor slabs replace timber decks while external walls often remain masonry. Galvanised steel water pipe, early rubber and fabric wiring, asbestos-cement roof sheets and downpipes.
1970 to 1990
Rapid expansion
Reinforced concrete frame with hollow ceramic brick infill. No meaningful thermal requirement. Single glazing and continuous concrete elements bridging inside to outside.
1983Regulation
RSA approved
Decreto-Lei n.º 235/83 updates the seismic regime. Buildings genuinely designed around those concerns start appearing from about 1990, which leaves most 1980s stock in the gap.
1990 to 2005
Modern appearance, older detailing
Contemporary finishes over recurring junction failures: thermal bridges at slabs and columns, ETICS or capoto detailing, terrace thresholds and drainage.
30 March 2004Regulation
Ficha Técnica da Habitação
Decreto-Lei n.º 68/2004 requires the technical sheet for property built, reconstructed or extended from this date. The duty to produce it survives, though it left the deed in January 2024.
2019Regulation
Seismic assessment for major renovation
Decreto-Lei n.º 95/2019 and Portaria n.º 302/2019 require a seismic vulnerability assessment for major renovation work.