Is a roommate agreement legally binding?

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Partly. A signed roommate agreement is a contract between roommates, and the parts about money, like rent shares, bills and deposits, can often be enforced in small claims court. Rules about chores, guests or noise are much harder to enforce, and the agreement never binds your landlord. Courts care about money and clear promises. If your agreement says each person pays $900 of the rent by the 1st and someone stops, a signed agreement plus payment records makes a strong small claims case. If it says "keep the kitchen clean," no judge will enforce that. It still helps, because it sets expectations and gives you something to point to. To make the money parts stick: Use exact amounts and dates, not "fair share" Have every roommate sign and date it, and keep copies Record payments through a traceable method, not cash Keep texts or emails where people agree to changes The agreement cannot change your lease. If the lease makes everyone responsible for the full rent, the landlord can still collect from you, whatever your roommate agreement says. It also cannot give you the right to evict someone or to change the locks on them. Small claims limits and procedures vary by state, and many courts publish plain-language guides online. For large amounts or complicated disputes, a local tenant organization or legal aid office can tell you what applies where you live.

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