Good news about storage size and extra space is that, most of the facilities for self-storage offer a variety of size storage units for rent. Majority of them offer sizes which include 5 inches by 5 inches, 5 inches by 10 inches, 10 inches by 10 inches, 10 inches by 15 inches, and 10 inches by 20 inches storage unit.
Most of them offer large sizes also. Most of the facilities for full-service storage also offer various storage unit sizes but the square and the price footage needed will tend to be based on the bins number or the boxes available. Full service storage unit sizes tend to vary, so you have to be sure of checking with the specific facility that you plan to utilize.
Typically, you can rent a storage unit for the length that you feel like. Whether you are out to look for a long term or short term storage, you will be able to find it at one of the many storage companies which are readily available.
There are certain people who try to rent storage units for an indefinite period of time as an extra space for work related or personal items.