This Practice Note considers the duty of care owed by occupiers to people who enter premises without permission, primarily under the Occupiers’ Liability Act 1984 (OLA 1984). It considers the definition of an ‘unauthorised visitor’ and explains when a duty may arise, the scope of that duty and the circumstances in which an occupier may avoid liability for injury caused by dangers due to, or relating to, the state of the premises. Background The Occupiers’ Liability Act 1957 (OLA 1957) was created to provide for a common duty of care owed by occupiers of premises. The duty was ‘common’ in that it was owed to various categories of lawful, or authorised, visitors, such as invitees, licensees and those whose right to be on the premises arose from a contract. Under OLA 1957, no duty was owed to unauthorised visitors or trespassers. The passing of OLA 1984 introduced a new duty, owed by occupiers to unauthorised visitors. It should be noted by practitioners that this duty is significantly more limited