The landlord/agent, or another person authorised by the landlord, can enter the premises without your consent and without notice, only in the following situations: 

• in an emergency or to do urgent repairs
• if the landlord thinks that the premises have been abandoned
• in accordance with an order of the NSW Civil and Administrative Tribunal (NCAT)
• if they have serious concerns about the health and safety of a person on the premises (after they have first tried to get your consent to enter).