Law No. 25-90 on subdivisions, housing groups and plot divisions, as amended and supplemented by Law No. 34-21 (Official Bulletin No. 7533 of 10 August 2026), distinguishes two cases.
Subdivision (lotissement, التجزئة العقارية): the division of land into two or more lots intended for building. It requires a subdivision authorisation issued by the president of the municipality, for land that is registered or undergoing registration without objection, with roads and utility networks. See the guide Creating a subdivision after Law 34-21.
Plot division (morcellement, تقسيم العقارات): the division into lots not intended for building, often a partition between heirs. In the areas covered by Article 58 (urban municipalities, delimited centres and their peripheral areas, areas covered by an approved urban planning document), a plot division authorisation is required; it is deemed granted after 30 days without a reply. See the guide Inheriting land and dividing it.
Before any plan, check what the urban planning document allows: minimum area, buildable zone or not. The guide Development plan, zoning, Taamir explains where to find these rules, and the What document do I need? tool points you to the right procedure.