Occupier/ˈɑːkjupaɪər/ Definition 1 of 2Pro Tip 1/3Legal Responsibility Refers to an occupier's duty to ensure safety for visitors on their premises. As an occupier, you must fix that broken stair to avoid accidents. Pro Tip 2/3Not Ownership Being an occupier doesn't necessarily mean you own the property. Even as a renter, you're the legal occupier of your apartment. Pro Tip 3/3Permission Required An occupier usually has permission to use the space, unlike a squatter. As the legal occupier of this office, I have the keys to the building.