Kulpa-Kulpavičius was responsible for work on many buildings, many of them churches. These include Our Lady's Church, Montreal (1952), St. St. Casimir's Church, Winnipeg and St. Gregory's Church, Toronto (1959), Lithuanian Martyrs' Church, Mississauga, Providence of God Church and Cultural Center, Detroit and St. Thomas Church, London (1978), Corporation Canadien Tire Building, Toronto (1979) etc. He was also the creator of small-scale architectural structures such as crosses and tombstones and built a collection of Canadian Inuit stone sculptures.