She trained and qualified as an architect at the KTH Royal Institute of Technology School of Architecture (Arkitekturskolan Kungliga Tekniska Högskolan.)

Since 1992 she has co-owned and co-led the company Rosenbergs Arkitekter with the Italian-born architect Alessandro Ripellino.

During this time Inga Varg took part in a number of competitions, designing residential projects including the Täppan district of south-central Stockholm Södermalm.

During her career Inga Varg has lectured regularly at KTH Royal Institute of Technology School of Architecture (Arkitekturskolan Kungliga Tekniska Högskolan) on residential planning and drafting techniques (skissmetodik.)

She has been a judge on the panels of many architecture competitions, including the Swedish Association of Architects’ Kasper Salin Award (Kasper Salin-priset), Stora Samhällsbyggarpriset, an annual award for civic and city planning projects in Sweden, and she has frequently been a judge on many of the competitions of the Swedish Association of Architects.