Build-ability and occupancy are key concepts when building on rustic land in Mallorca. Maximum build-ability defines the allowable built square meters as a percentage of the land, varying from 1% in protected areas like the Natura 2000 Network to 1.5% in other areas. Maximum occupancy refers to the allowed impermeable surface area, which includes pools and terraces, with limits of 1.5% in protected zones and 2% in other lands. Additionally, the volume of buildings cannot exceed 900 m³, and swimming pools have a maximum size of 35 m² and a volume of 60 m³. Additional restrictions may apply based on urban planning.

The difference between a CPO and Major Construction lies in the scope and type of permitted work. A CPO is used when the developer notifies the local council about a construction project that includes only minor works or simple renovations. In contrast, for any work involving significant or large-scale modifications, it is mandatory to apply for a Major Construction permit.