At present, improving the environmental safety of capital construction objects for various purposes in urban areas is still an urgent goal and a rather complicated process to implement. To achieve it, you need, first of all, a scientifically based methodology for assessing the actual level of environmental safety of a particular construction object or urban economy and a list of necessary measures to increase it. Our earlier analysis of known methodological approaches to assessing the state of the urban environment allowed us to conclude that when assessing the level of environmental safety of capital construction objects for various purposes, it is necessary to take into account social, environmental, economic factors and take into account a number of limitations. In this regard, we conducted scientific research, on the basis of which the scientific and methodological principles of forming an assessment of the level of environmental safety of capital construction facilities for various purposes in urban areas were determined. At the same time, the basis for a consistent assessment of the level of environmental safety of construction objects for various purposes in urban areas, in our opinion, is a comprehensive consideration of environmental, economic and social criteria, each of which includes corresponding groups of parameters (environmental, social and economic) that determine the degree of environmental safety and sustainable development. Our approach allows, using the various characteristics of an urbanized area with different dimensions, to obtain the resulting criteria in a dimensionless form and thereby improve the methodology for calculating a comprehensive assessment of the environmental safety level of construction objects and urban facilities in urban areas.