He was born in Bergen, a son of merchant Claus Hansen and Elisabeth Schram, and was a brother of Gerhard Armauer Hansen. He was first married to Ida Christine Johannessen, and a second time to Dorothea Marstrand Serck. He was the father of mining executive Klaus Serck-Hanssen, and grandfather of Arne Serck-Hanssen.
He served as a deputy representative to the Norwegian Parliament during the terms 1889–1891, representing the constituency Bergen. He was a member of Bergen city council for several years, and served as mayor in 1894. He later joined the Coalition Party, and served as a parliamentary deputy again during the term 1904–1906.
- Lærum, Odd Didrik. "Klaus Hanssen". In Helle, Knut. Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 6 December 2014.
- Steenstrup, Bjørn, ed. (1973). "Serck-Hanssen, Klaus". Hvem er hvem? (in Norwegian). Oslo: Aschehoug. p. 499–500. Retrieved 6 December 2014.
- Fridrichsen, Anton, ed. (1929). "Serck-Hanssen, Klaus". Studentene fra 1904: biografiske oplysninger samlet til 25-årsjubileet 1929 (in Norwegian). Oslo: Grøndahl. pp. 335–336.
- Klaus Hanssen — Norwegian Social Science Data Services (NSD)
- "Ordførere i Bergen kommune fra 1837 - 2007" (in Norwegian). Bergen municipality. Archived from the original on 2012-02-13. Retrieved 2008-10-06.
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