At the stage of planning a construction project, an assessment must be made of possible variants of its implementation. Variants may pertain to the localisation, economic aspects as well as the actual construction and design solutions. This article deals with the question of selecting the localisation for a construction project consisting of building a plant for thermal treatment of waste. In order to chose an optimal location, first we must establish assessment criteria which will guide us through a supported choice procedure, and next we should apply a method for the evaluation of variant solutions. Some criteria refer to measurable phenomena and are therefore easy to be defined and weighed. Others require descriptions, designating the right scale and proper methods for their identification. The article contains an example of a set of criteria and a case study of using multi-criteria analytical methods for selecting the location to develop a specific construction project such as a Waste Thermal Treatment Plant. Some well-known methods are compared with the approach proposed by the author. The methods applied in analyses have certain advantages and disadvantages. Irrespective of which method is applied, a reliable and trustworthy analysis of the location for a future construction project brings about many benefits. Such an analysis creates an opportunity to become aware of problems and obstacles which one may come across both while executing the project and in the many years to come, when the raised construction is used.