A parcel of land may consist of one or more lots, which are listed in the land register under a serial number. If these lots are listed in the land register under the same serial number, they are also considered a single parcel of land under building law. If they are listed in the land register under different serial numbers, they are considered separate parcels of land.

The Hessian Building Code (HBO) regulates property divisions under Section 7—accordingly, a division permit from the building authority is required to divide a property that is developed, has been approved for development, or may be developed under an exemption from the permit requirement.