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1 A 5x5 foot storage unit usually runs about $40-$50 per month. 2  10x15 foot units cost $75-$140 per month or $115-$150 for a climate controlled space. 3  A 10x20 unit ranges from $95-$155 per month or $170-$180 for climate controlled. 4  20x20-foot spaces rent for about $225 per month.
The average national storage unit costs are: $40-$50 per month for a 5-by-5-foot unit. $75-$140 per month for a 10-by-15-foot unit. $115-$150 per month for a climate-controlled 10-by-15-foot unit. $95-$155 per month for a 10-by-20-foot unit. $170-$180 per month for a climate-controlled 10-by-20-foot unit.