How long must an assured shorthold tenancy last?
The AST is for a minimum of 6 months. You can agree that it lasts for a set term, for example 6 months or 12 months, or you can leave the term open ended. Once the initial six month period ends you have the option of renewing a fixed term or allowing the tenancy to run-on, on a periodic basis, this being the rent period – monthly or weekly.