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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.
1 The cost of a storage unit varies depending on several factors. 2  For instance, the location or state, size or area, and specifications, among others, may have an impact on the price. 3  On average, the prices of a storage unit can range anywhere from as little as $25 to as much as $250 per month. For instance, a 5 x 5 foot storage unit costs around $40 to $50. 2  A 10 x 15 foot space runs around $75 to $150 and a 10 x 20 foot storage unit costs around $95 to $180.