Landlord changing locks after section 8 expired?

You cannot lockout a tenant, even if you have given them proper written notice to vacate. You must follow legal eviction procedures. Every landlord should learn all the basics of landlord-tenant law BEFORE getting into this business! It would save you time, money and headaches. If you do not know the specifics of legal procedures for eviction, then you had better get an attorney/solicitor pronto before you get yourself into a costly legal mess.