In California, you cannot evict someone without a lease without going through the legal process. You must first give proper written notice, such as 30 or 60 days to terminate or a 3 day notice for nonpayment or cause. If they do not leave, you must file an eviction case in court and obtain an order before the sheriff can remove them. Additionally, you may need a valid legal reason to evict depending on local or state tenant protection laws.
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The information for this answer was found on our California Eviction Notice Form answers.