The Hawaii roommate agreement allows tenants who share the same leased premises to agree to a set of rules and responsibilities in a signed document. The most important purpose of the contract is to record the agreed-upon division of rent and expenses. It also allows all parties to make rules that determine any prohibited behavior and create guidelines for noise curfews and overnight guests. Signing an agreement holds each party to terms that cannot be disputed, thereby ensuring that the leased premises and other tenants are respected.