If you have roommates, you’ll want to consult them before bringing visitors — especially longer-term visitors — into your home. Secondly, check your lease terms to see if your landlord has already outlined a guest policy for how long people not on the lease are allowed to stay on the premises. Many leases have special terms that add extra rent costs when more residents occupy the apartment. Sometimes the leases forbid new tenants altogether, as many landlords don’t want to be responsible for people not signed on the list.