The article describes the technique of geodetic executive surveys of inclined surfaces of building structures and the control of their condition, involving processing of measurement results using approximating surfaces. Meanwhile, deviation structures design provisions in a specific spot is on the calculated distance from the point whose coordinates are defined on the surface of structure to the approximated surface. The equation approximated surface can be obtained in different ways: on the basis of geodetic measurements of three coordinates of all points on the surface of these structures or on the basis of design size of structures which associated with these dimensions the beginning of geodetic coordinates. The variance of controlled points from approximating surfaces or mutual position of the surface at different stages of research represents the parameters that are required to be reflected in material of executive surveys.