The Urbanization project is a technical urban planning document, which is nothing other than the executive project of the urbanization works of a street, square, polygon (urban planning), sector (urban planning), neighborhood, etc.

Urbanization project is the document that defines the urban proposal at the most detailed level, it indicates what the streets and squares will be like, as well as the green areas, the slopes "Slope (engineering)") or protection margin, etc., It also defines how and in what way the urban services (underground or aerial, such as: sewage, water supply), gas supply and electricity supply, both low voltage and medium voltage and often also high voltage, the telephone and other telecommunications network"), etc.[2]​.

Although the superior or reference planning instruments of an urbanization project, such as the partial plan or special plan, already indicate and frequently outline the urban services, determining some of their parameters, it is not until the urbanization project is drafted and approved that the works to be carried out are defined so that they can be executed.[3]​.

Urbanization projects are mainly carried out to carry out the urbanization works of the new industrial estates, but the fact that there are still old urbanizations in which the streets will either never be urbanized and must be done now, or will be subject to poor urbanization that must be reformed, brings the urbanization project closer to the ordinary citizen, inexperienced in the subject who, in addition, must contribute financially to the works, through "Special Contributions")" or inclusion in an Action Unit urbanística_de_Actuaci%C3%B3n_Urban%C3%ADstica&action=edit&redlink=1 "Urban Planning Action Unit (or polygon) (not yet written)". The same can be said of urbanization or the partial or total reform of what exists in a town, or the pedestrianization of historic or commercial centers, etc.

The urbanization project is not an instrument of urban planning and cannot change the urban use, nor the heights of the buildings, nor the widths of the street nor the fundamental grades of the streets and squares nor, in general, the determinations that correspond to an instrument of urban planning, which by virtue of being such, has a higher rank (principle of normative hierarchy").[4]​.

Since its determinations do not, in general, have the legal and economic relevance of an urban planning instrument, it is often disregarded as a secondary document, which must be considered a serious error, especially in consolidated urban areas), since the urbanization project indicates what the houses will be in front of, how wide the sidewalks will be, what will be the curbs, the fords "Ford (place)"), the streetlights and the trash cans, etc. of the entire urbanization.