A California roommate agreement is a document that contains the rules and responsibilities that a group of roommates establishes to maintain order in their shared residence. An agreement will usually contain provisions that divide cleaning responsibilities, utility payments, expenses, and rent. Making a formal agreement helps to ensure a harmonious living arrangement and prevent disputes between the roommates. Although the signed document is not as legally binding as a lease, certain terms may be held up in court if a legal dispute arises (such as a roommate’s refusal to pay their share of the rent).