These topics are generally covered by a roommate agreement:
Rent per resident (especially if the rent for one roommate differs from the
rent other occupants pay. This is common when one room is substantially
bigger than other rooms in the unit.)
Utilities percentage per resident
Security deposit percentage per resident and how any remaining security
deposit will be disbursed after the lease is over
Early move-out of one resident
Overnight guests
Food and shopping arrangements
Cleaning responsibilities and expectations
Privacy and entry into personal spaces
Resident and guest parking
Sharing belongings, such as clothing items
Noise and study times
Parties and entertaining
Alcohol, smoking, disruptive hobbies or activities
19 | Off-Campus Living Guide