Yes, customers can modify their reservations at Extra Space Storage. The process typically allows for adjustments to be made regarding the size of the unit, the rental duration, or the move-in date. If a customer needs to change their reservation, they can often do so through the Extra Space Storage website or by calling the facility where they made the original reservation. It is important to check for any specific policies that may apply to changes, as terms and conditions could vary by location. Customers should also be mindful of any potential fees that might be associated with changing a reservation. For complete details on how to make these changes, it is advisable to refer to the Extra Space Storage website for the most accurate and up-to-date information.