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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
Eiendom Basis geodata Geointegrasjon Matrikkel Eiendom
The Cadastre is Norway's official register of real property, including buildings, housing and addresses. 

The Geointegration project is a project working on joint interface standards and principles for interaction between professional systems, GIS and case/archive systems in the public sector.
The project has defined a number of interfaces, including 3 for Cadastral data.
The Cadastre's Geointegration API