“Zombie developments”, i.e. the problem of unfinished development projects, is an unrecognised phenomenon in Poland. In the USA, research on the causes, consequences and actions aimed to reduce the nuisance has been conducted for years. Therefore, the aim of this article is to show, through case studies, that the problem of “zombie developments” also occurs in Poland, causing many negative consequences for various entities. At the same time, this study is intended to help identify the causes of this phenomenon in Poland.