In Delaware, the maximum duration of a standard rental lease agreement is one (1) year. Leases can be longer than one year as long as they are written, signed, and agreed upon by the landlord and tenant.
Oral leases are valid for shorter terms, but all leases of one year or greater must be in writing. It is generally recommended for all leases to be in writing, as oral leases are more difficult to enforce.
If there is no rental term provided in the lease (written or oral), it is considered a month-to-month tenancy (25 DE Code § 5106 (2019)).
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The information for this answer was found on our Delaware Residential Lease Agreement answers.