The article presents the systematics of various types of geometrical surfaces in the aspects of their occurrence in Gaudi’s architecture. Basic groups of surfaces were characterized, focusing on those typical for the architect. The aim of the analysis of three-dimensional forms is the knowledge of geometrical shapes that form a work of architecture. It can facilitate the understanding of construction of the body and familiarize the concept of the project. On the basis of abovementioned systematics examples of buildings are presented, in which Gaudi used particular surfaces. Causes and results of usage of such spatial solutions in structural and aesthetic aspects are discussed. The article includes buildings designed by Gaudi in Barcelona and Colonia Guell.