Requirements for construction are enacted in Building Act (forced 01.01.2003). Building design documentation is obligatory for construction activities. On high density areas the general principles of planning are enacted in detail planning. Construction may start if local government gives a building permission. Building permission also enacts the order of the supervision of the construction. Local governments also provide with permission of using the construction. Permission of use also determines the finality of construction. In case of rebuilding for changing the finality of construction, new building design documentation and building permission is obligatory.