 As a child Ullberg had studied at the Viborgs konstvänners ritskola art school, where later also, in 1906–1913, he was a teacher.Ullberg graduated in 1901 from the architectural faculty at the Helsinki Polytechnic Institute (Polytekniska institutet in Swedish), now Aalto University.After graduating he worked as an architect at the offices of Nyström, Petrelius & Penttilä in Helsinki.