 As an architect, Carlberg was industrious and designed structures of all sizes all over town, few of which were ever built and considerably less have survived.His most notable surviving deed is the present Baroque exterior of the Storkyrkan church, a product of the reconstruction 1736-42 which amalgamated the appearance of the medieval church with that of the new palace.As a city planner, Carlberg reworked the building code at several occasions which resulted in wooden buildings being prohibited on the ridges surrounding the medieval city.