A Part 4 tenancy generally arises automatically after you have rented a property for six continuous months, provided the tenancy has not been validly ended. It gives you stronger security of tenure, meaning your landlord normally needs a legally permitted reason and must follow the correct notice procedure to end the tenancy. For tenancies that began on or after 11 June 2022, the rules generally refer to a tenancy of unlimited duration rather than a six-year Part 4 cycle. The RTB can assess whether a termination is valid based on the individual facts, so check its current guidance or seek advice from a solicitor if needed.