5x10 storage unit cost: the best-value small size

A 5x10 is 50 square feet of floor at the industry-standard 8 foot ceiling, so 400 cubic feet: exactly double a 5x5. The rent is never double, and the reason is worth understanding before you take a quote, because it is the single best argument you have for sizing up.

The costs of running a storage unit do not scale with its floor. Each unit needs a door, a lock, a light and a share of the aisle it opens onto, and the facility spends about the same securing, insuring, cleaning and administering a small unit as a large one. Those fixed costs land once per unit, not once per square foot. Double the floor and you spread the same fixed load across twice the area, so the rate per square foot falls sharply. That is why the smallest sizes are the dearest per square foot on every price list, and why the 5x10 sits in the sweet spot: it is the smallest unit that genuinely holds real apartment furniture, at a per-square-foot rate far closer to the large sizes than to the 5x5.

The other half of the price is the land. Rates differ several times over between a coastal metro and an inland one for the same box of air, and that is a pass-through of what the ground under the building cost, not an operator marking up one city more than another. It is also why a site fifteen or twenty minutes out of the centre is usually the largest saving available to you.

The only rent figure on this page you can check for free comes from an annual report rather than a listing page. Public Storage's Form 10-K, FY2025 (filed 12 February 2026, period ending 31 December 2025) reports realized annual rent of $22.54 per occupied square foot across its Same Store Facilities, against $22.43 a year earlier, at 92.0% average occupancy. Read it as a measure of one company's business, not as a price list. It blends every size and every market the company operates in, so multiplying it by 50 square feet will not give you a 5x10 rent, and the direction of the error is not even consistent: small units sit above the blend, large ones below it.

The 5x10 is the size where the math meaningfully changes. A 5x5 is closet-overflow. A 5x10 is real apartment storage. The deciding question is mattress size: a queen will fit (75 inches long lined up against the 10-foot wall), a king will not (76 to 80 inches wide, leaves no room to add anything else useful). If you have a king bed in your inventory, you are looking at a 10x10 minimum.

For two-roommate college storage, the 5x10 is also the right size most of the time. Two twin XL mattress sets plus dorm furnishings (mini fridges, microwaves, two desk chairs, two desks broken down, plus 15 to 20 boxes of clothing and books) all fit. Three roommates require a 10x10 or two separate 5x10s, and which is cheaper varies by site, because two units mean two administration charges and two lots of cover.