The quality of the construction services provided has always played an important role not only in maintaining the safety and proper functioning of the construction objects in question, but also in other related features, which will also be the subject of a research study with the target group of the construction objects in question in the Mazowieckie Voivodeship in Poland. This article explains the concept of quality and quality in terms of construction services. It indicates their essence and the process of implementation in the long-term perspective during the operation and exploitation of a building object. The process of quality assessment is based on the selection of contractors for construction works using fuzzy logic. The procedure of prequalification with the use of fuzzy sets was also used for such an assumed purpose.