Storage unit size guide: choose from your actual inventory

Make an inventory that can become a layout

List furniture, appliances, mattresses, outdoor equipment and packed cartons separately. For every large item record width, depth and height in its permitted storage orientation. Note removable legs, dismantled frames and parts that must remain assembled. Measure after allowing for covers and protective packaging.

For cartons, record external dimensions, weight and whether they can support another carton. Mark fragile, upright-only and frequently needed goods. Do not assume that everything filling a home closet will stack like a uniform moving box. A counted, measured list is more useful than the number of bedrooms in the home.

Compare common footprints

Extra Space Storage publishes a range of standard size illustrations, but also says exact dimensions depend on the available unit. Use the following nominal footprints to choose which rooms to inspect; provider bedroom examples are not fit guarantees.¹ source

• 5x5: 25 square feet; test boxed seasonal goods and small furniture, with special attention to locker height.
• 5x10: 50 square feet; a narrow, deeper layout for measured bedroom furniture or modest moves.
• 10x10: 100 square feet; a square plan that offers more arrangements for mixed furniture.
• 10x15: 150 square feet; additional depth for appliances, furniture groups and retrieval.
• 10x20: 200 square feet; compare a substantial household load or separately approved vehicle storage.
• 10x30: 300 square feet; a long layout needing deliberate zones and a route to the rear.

Draw usable space, including the empty parts

Use graph paper or a scale drawing and place the largest rigid footprints first. Add stackable goods only where the lower item or shelving can safely support them. Mark the door, columns, roof slopes and equipment. Leave working space where you will turn, lift or open a carton.

For a dimensioned example, draw a 10-by-10-foot room and reserve a hypothetical 3-foot-wide central strip from front to back. The two side storage zones must share the remaining width. If a couch or shelf does not fit one zone, change the arrangement rather than quietly deleting the aisle. The example strip is a planning choice, not a building rule or a universal handling clearance.

Check the whole route into the room

Measure the largest rigid item against the unit door, elevator entrance and interior, hallways and turns. Include the room needed to tilt or rotate an object safely. A mathematical diagonal is not proof that a bulky couch can make the turn, and forcing a mattress through a doorway may conflict with its manufacturer’s instructions.

Ask for usable ceiling height, not only the highest point. Extra Space’s example cubic capacities use an eight-foot ceiling while the same guide notes taller and reduced-height products.¹ source Even where headroom exists, you can use it only if your belongings, shelves and handling method support safe stacking.

Decide how much access you need

For a move with one final collection, you may be comfortable placing seldom-needed furniture behind cartons. For seasonal clothes, tools or business stock, plan an aisle and labels visible from it. Extra Space recommends keeping frequent-use goods near the front, heavier goods below lighter ones, and a map of the unit.⁹ source

The room must work for your physical handling limits too. Do not create a plan requiring you to lift a heavy carton above shoulder height or move a refrigerator every time you need a suitcase. A slightly larger usable room may be a better decision than the smallest room in which everything can technically be packed.

When to size up, split or reduce the load

Size up if the layout depends on unsupported stacks, prohibited orientations, inaccessible essentials or disassembly you cannot perform. Consider reducing the inventory before paying to store bulky things you will not use again. Include moving costs in that decision: a low-value couch may require paid handling both into and out of storage.

Two smaller units may separate retrieval needs, ownership or environmental requirements. They do not create one large doorway or continuous floor. Compare combined rent, locks, insurance requirements and fees. Ask about transfer availability and charges rather than assuming another unit will be ready if your first choice is too small.

Compare the same size with the same features

An upstairs interior room, a ground-floor room and a drive-up room can involve different moving work even at the same nominal size. Check loading-bay arrangements, carts, tenant hours and actual walking distance. U-Haul distinguishes tenant-access hours from staffed office hours, which vary by location.² source

For sensitive belongings, check heating, cooling and dedicated humidity management rather than assuming indoor means climate-controlled. Obtain a written full-stay quote for the actual product, then inspect the allocated unit before loading. Keep the measured inventory and photographs so later retrieval or a move to another size is easier.

Questions to settle

Related guides

• 5x5 storage units: what fits in 25 square feet?
• 5x10 storage units: furniture, mattresses and a usable layout
• 10x10 storage units: plan 100 square feet without a fit guess
• 10x15 storage units: furniture, appliances and room to retrieve
• 10x20 storage units: household storage or an approved vehicle space
• 10x30 storage units: planning a large move or stock room