The author analyses modern technologies and equipment used for producing and installing metalwork and also some types of structures. Therefore, additional reserves of increase in technological effectiveness were due to the selection of the optimal geometrical form, improvement of separate parts of the structure, values of separate design data for certain manufacturing technology. The complex indicator of technological effectiveness should be used by organizations involved in production and installation of metalwork for increasing complex technological effectiveness in comparison with the project variable design. Issues of the experiment were: 1) to give justification of a technique to define a complex indicator of technological effectiveness and the assumptions made when developing this technique; this can be achieved by comparison of theoretical and actual values; 2) to confirm that an improved constructive and technological solution results in the increase of the complex indicator of technological effectiveness in comparison with the design option.