It depends on your lease. If you signed a lease which stated you cannot have overnight guests, then you cannot have overnight guests, unless such a clause is illegal in your jurisdiction. If the lease does not speak to overnight guests, then you can have overnight guests. However, if by guest you mean someone who is living with you, the landlord can most certainly prevent that, unless you live in a jurisdiction where such a limit is not allowed.Many leases will limit guests beyond a certain time period to prevent any formation of a legal right on the part of that guest. In addition, many landlords will charge more if more people will be living in the home than he agreed to in the lease.u00a0 This is another reason for limiting how long guests are allowed to stay.