In nearly every state, you have a right to "quiet enjoyment" of your rental — meaning your landlord cannot just walk in whenever they want. Most states require 24 to 48 hours of written notice before non-emergency entry, and entry must be at a reasonable time of day.
Texas, Arizona, Nevada, New Mexico and most other states require advance written notice (text or email usually counts) before a landlord can enter for inspections, repairs, or showings.
A landlord can enter without notice if there's an active emergency — fire, flooding, a gas leak, or reasonable belief someone inside is hurt. "I wanted to check on the place" is not an emergency.
Even with notice, your landlord generally cannot show up at 6 a.m. or 11 p.m. "Reasonable hours" usually means normal business hours unless you've agreed otherwise.
If the landlord didn't give proper notice, you can decline entry. They can reschedule with notice, but they cannot punish you for refusing or change the locks because you said no.
A landlord who keeps entering without notice can be sued for breach of quiet enjoyment, harassment, or even trespass. In some states, repeated violations let you break the lease without penalty.
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