He is most associated with his work at Akershus Fortress, where he was a member of the restoration committee and architect from 1905 to 1922.

[3] Sinding-Larsen began his education at Kristiania tekniske skole (now Oslo ingeniørhøgskole) from 1885 to 1889 and received training from Herman Major Schirmer during surveying in Gudbrandsdalen.

Holger Sinding-Larsen was also awarded a silver medal for Designs for Town Planning in connection with the 1920 Summer Olympics in Antwerp.

In 1906, he started the Christiania Architectural Association, he also served as a teacher at the National Academy of the Arts School.

He was awarded the King's Medal of Merit in gold and Fridtjof Nansen Prize for Outstanding Research.