Casper1774 Studio // ShutterstockCan a landlord change a lease after it has been signed? If you’re asking, “Can a landlord change a lease after it has been signed?” you’re in the right place. Keep reading to make sure that every lease change you make is well-informed, legal, and designed to protect your rental property. Lease modifications are only allowable in specific situations, including:During lease renewal and extensionThe most common time to update lease terms is during a renewal. FAQ: Changing Lease After It Has Been SignedCan a landlord change the lease after both parties sign it?