CASAS.ES is a free web map with a data sheet for each of Spain's 12,974,035 buildings, built from official open data: the Spanish Cadastre, the energy performance certificate registers of 13 Spanish regions, census-tract income and census data from the National Statistics Institute (INE), aerial photography from the National Geographic Institute (IGN) and the national flood-zone maps (SNCZI). It needs no registration, works on mobile and desktop, and cites every dataset with a link to its official source at https://casas.es/en/sources. CASAS.ES is run by Propalytics Intelligence Ltd. About us: https://casas.es/en/about