If you’ve ever leased an apartment, house or other property, at some point the lease can expire, usually after a period of a half-year to a year. Continued arrangement to rent the property may result in a tenancy at will agreement. Tenancy at will expresses an agreement between a landlord and renter or tenant to occupy a property, provided rent continues to be paid, for an unspecified period of time, so long as both landlord and renter agree about the renter retaining tenancy.

Some dwellings that are rented may be rented initially through a tenancy at will agreement, or what is called a month-to-month agreement. This means that either the landlord or the renter can choose to terminate the agreement with appropriate notice given. An exception exists that can violate even the strongest lease. If a property owner loses his property, as through foreclosure on his mortgage, any agreements made between renter and former owner are invalid. From a legal perspective, a tenant with a longstanding lease that is violated can sue the former owner for lease violation.

There are some things to consider if you enter into a tenancy at will agreement with a property owner. The owner can terminate your right to occupy the property at any time, usually with thirty days notice. If the owner decides to sell the property, especially just after you’ve moved in, you may encounter pretty stiff costs in having to move again quickly.

It’s a good idea if you plan to occupy property for a long period of time to ask for a lease agreement, especially for the first six months to a year. Alternately, if you don’t want to be tied down by such an agreement, you might want to ask the property owner’s intentions toward the continued rental of the property. Do find out if your tenancy at will agreement means you’ll have to move soon.

On the other hand, some tenants don’t want leases and would prefer a tenancy at will agreement from the onset. Especially if they are renting property for a short duration, they want the option of ending their property occupation at any point without incurring charges or damages for violating a lease agreement. People who move to new areas might choose to not sign up for lease agreements if they’re unfamiliar with the area and are concerned they may not like the area to which they've moved. Some people can successfully change a tenancy at will contract to a lease agreement if they find they’re happy with an area to which they’ve relocated. Others plan to be in the area for only a short time and want nothing to do with the potential shortfalls of breaking a lease, or may ask for a short-term lease.

Property owners must also decide what form of agreement serves them best. The advantages of tenancy at will agreements to the property owner are that it allows them to ask a tenant to leave at any time, given appropriate notice, which they might want to do if they decide to sell the property or if the tenant is behaving in a manner that is concerning to property owners. On the other hand, some landlords prefer lease agreements because it assures them that the renter will stay put (under most circumstances) for the length of the lease. Usually after that lease is up, most property agreements do revert to month-to-month rentals, unless the property owner remains concerned about retaining a tenant for a specific period of time.