Beate Ellingsen AS Interiørarkitekter was established in 1992 by Beate Ellingsen, who has experience in interior architecture since 1978. The office specializes in interior architecture for both large and small projects, and has been involved in the rehabilitation of prominent institutions and public buildings. One of the notable projects includes the National Theatre's rehabilitation, where they were responsible for user equipment.
In addition to their projects, Beate Ellingsen AS offers tours of the University Library, which gives an extra dimension to their work. The company has also contributed to the field by publishing articles on interior architecture in the NIL yearbook, which underlines their commitment to sharing knowledge and experiences within the industry.