Planning permission is required for the carrying out of any development of land. The aim of this report is to understand the concept and procedure of development control law and identify what forms of development require a grant of planning permission, and which do not. It begins with setting out relevant facts of the case. Then it focuses on analyzing the lawfulness of the various activities on the land separately. At the same time, it is necessary to develop the understanding of intensification and the planning unit, since a material change of the use of a building or other land can occur through them. It is also important to explain the purpose of a planning contravention notice, the enforcement powers and procedure of the Local Planning Authority (LPA) to my client. Finally, it will presents what further actions may be taken by the LPA according to the relevant legislation and case law in the end of the report, such as issue an enforcement notice or a stop notice and, in particular, take enforcement action and so on.