“…According to Decree-law 309/2009, a building could have relevant cultural interest in historic, paleontological, archeological, architectonic, artistic, ethnography, scientific, social, industrial or technical and these must be demonstrate, separately or jointly, memory values, antique, authenticity, originality, rarity, uniqueness or exemplary. The cultural heritage involves a complex process of interdisciplinary approach values such as identity, authenticity, integrity, exemplarity, originality, oldest and many others recognized as cultural ones to preserve in collective memory and our history (Mazzanti 2002). Portugal has 5.9 million residential units and 17% of them are old with vernacular characteristics before the advent of reinforced concrete building.…”