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Changes relating to buildings, addresses and properties are updated regularly, but there may be errors and omissions in old data added from GAB and DEK as the Cadastre was established in 2010. Please see cadastral history: http://kartverket.no/globalassets/matrikkel/kurs/forkurs/pdf/2-den-norske-eiendomsregistreringens-historie.pdf
Administrative enheter Eiendomsteiger Bygninger Adresser NSDI data Geodata Act Norway Digital Beredskapsbase Felles datakatalog Eiendom Basis geodata Matrikkel Matrikkelen Adresse Bygning Eiendom Eiendomskart Vegadresse Bruksenhet planningCadastre
The Cadastre is Norway's official register of real property, including buildings, housing/housing units and physical addresses.
The Cadastre is regulated by the Cadastre Act which came into force on 1 January 2010 and replaced the previous Land Partition Act.  

The Cadastre also includes data from official registration, the population register, the central coordinating register for legal entities, ground contamination and cultural monuments.
The Cadastre, Norway's official property register