The study discusses the problem of financial impact on Wroclaw Municipality exerted by the costs of implementing decisions resulting from the selected local spatial development plans. Currently in Poland, at the stage of local spatial development plan establishment, a forecast of financial consequences is prepared. The expected own revenues and the costs of financial impact exerted on the municipal budget are presented in this document. The study facilitates making decisions about the final version of the local development plan. Taking into account the planned spatial development in the area of Wroclaw city, the urbanization costs exerting financial impact on the municipal budget were identified. The study analyses only the cost of implementing investments within the scope of the municipality own tasks, including the cost of constructing municipal roads, sanitary sewerage system, water supply system, public greenery facilities and land purchase for public investments. The analyses covered two selected areas of the city, located in its different parts. These are largely uninvested areas, predominantly constituting agricultural land, and such land development requires the construction of technical and social infrastructure facilities. The anticipated costs of implementing local development plans in force in various parts of Wroclaw indicate significant expenses to be covered by Wroclaw Municipality in order to build sewage systems and municipal roads. Taking up new development sites is also correlated with taking over the real properties by Wroclaw city, on which the implementation of public goals is planned.