A Maryland tenant may be allowed to change their own locks without informing their landlord in advance. This is because the state’s landlord-tenant laws do not specifically prohibit this course of action. That being said, it is always in a tenant’s best interest to speak with their landlord before performing a lock change so that they can obtain a new key copy when the job is complete.
The information for this answer was found on our Maryland Landlord Tenant Rights answers.