The size of the storage unit you will need will depend on the number of things you have to put in storage. Based on the average content of a household, here’s the storage unit size you’ll need: Size of home Storage unit size needed Less than 500 sq. ft.5’ X 10’ 500 sq. ft.10’ X 10’ 800 sq. ft.10’ X 15’  1000-1200 sq. ft.10’ X 20’ 1600 sq. ft.10’ X 25’ 2000-3000 sq. ft.10’ X 30’ Over 3000 sq. ft.Over 10’ X 30’