A storage unit that is too small creates a frustrating game of Tetris. One that is far too large means paying for empty floor space. Choosing between storage unit sizes is simpler when you start with what you are storing, how often you need to reach it and whether more items are likely to follow.
At Thornton Storage, units range from compact 15 sq ft spaces to substantial 500 sq ft units. That gives households, movers and local businesses room to choose what genuinely fits, without being pushed into more space than they need.
Start with the space you need today – and tomorrow
Before choosing a unit, make a quick inventory. Include the obvious large items such as sofas, beds, white goods and filing cabinets, but do not forget boxes, garden tools, bicycles, stock and awkwardly shaped items. These smaller things are often what make a carefully planned unit feel tight.
Think about the reason for storage too. If you are storing the contents of a flat while moving, you may be able to pack densely for a short period. If you run an online shop and need regular access to stock, leave a clear path through the unit and allow room for incoming deliveries. A unit with extra floor space can save time every week.
It is sensible to allow a little growing room, especially during a renovation, a long house move or a busy trading period. There is no need to rent a unit twice the size for a few possible boxes, but choosing the absolute minimum can become a false economy if you have to move everything into a larger unit a month later.
Storage unit sizes at a glance
Square footage tells you the floor area, but the best way to picture it is through familiar spaces and the type of load it can hold. Exact capacity depends on how furniture is dismantled, how high boxes can be stacked safely and whether you need access inside the unit.
| Unit size | Easy way to picture it | Often suitable for | | — | — | — | | 15 sq ft | A large locker or small cupboard | Archive boxes, suitcases, sports gear, seasonal items | | 25-35 sq ft | A small garden shed | Bedsit contents, a few boxes, small furniture or business records | | 50 sq ft | A larger garden shed | Studio or one-bedroom flat contents, appliances and furniture | | 75 sq ft | A small garage section | One to two-bedroom home contents or regular business stock | | 100 sq ft | Around a single garage | Two-bedroom home contents, tools, equipment and larger stock loads | | 150-200 sq ft | A large garage or Luton van load | Three to four-bedroom moves, trade equipment or growing stock | | 500 sq ft | A substantial commercial storage area | Large household moves, bulky equipment, pallets or business operations |
These are practical guides, not rigid rules. A carefully packed two-bedroom flat can fit in less space than a lightly packed one-bedroom property filled with bulky furniture. If you are unsure, describe your items before booking and use the comparison as a starting point rather than a guarantee.
15 to 35 sq ft: small spaces for clutter and records
Smaller units are ideal when the goal is to clear a room, not empty a whole home. They work well for moving boxes out of a spare bedroom, storing university belongings over the summer, keeping camping equipment dry or protecting documents that are taking over a home office.
For businesses, this range can be a straightforward answer to archive storage. Rather than filling valuable workspace with old paperwork, packaging or promotional materials, keep it secure and accessible elsewhere. Stack strong boxes to make the most of the height, label every side and keep an inventory on your mobile phone.
50 to 75 sq ft: a practical choice for flats and stock
A 50 sq ft unit is often the point where storage becomes useful for a full room of furniture as well as boxes. It can suit a studio or one-bedroom flat move, particularly if mattresses are stored upright, tables are dismantled and drawers are emptied before moving.
At 75 sq ft, there is more flexibility for a one or two-bedroom property or a business that needs space for boxed stock. This size is also worth considering if you want to access items during storage. Leave a narrow central aisle rather than packing wall to wall. You lose a little capacity, but you avoid unloading half the unit to find a particular box.
100 sq ft: room for a proper house move
A 100 sq ft unit is a popular middle ground for larger moves. It can often accommodate the contents of a two-bedroom home, including sofas, beds, white goods, dining furniture and boxes, depending on how much bulky furniture you own.
It is also a sensible option for tradespeople. Tools, materials, ladders, shelving and equipment can quickly take over a garage or van. A secure unit gives you a base for overflow items, while keeping your home or working vehicle less crowded. If access is frequent, plan where heavier items will sit before the first load arrives.
150 to 200 sq ft: more capacity without compromise
For the contents of a three or four-bedroom home, 150 to 200 sq ft may provide the breathing room that smaller units cannot. This is especially relevant during a chain delay, a renovation or a move where furniture will be stored for several months.
For commercial customers, these sizes suit businesses with seasonal peaks, expanding product lines or bulky tools and equipment. A decorator may need room for equipment and supplies; an e-commerce seller may need shelving, packing materials and space to sort orders. The right layout matters as much as the total area. Put regular-use stock near the front and longer-term items towards the back.
500 sq ft: for large moves and serious business storage
A 500 sq ft unit is intended for substantial requirements. It can be suitable for a large house move, a sizeable volume of business stock, bulky machinery, furniture held by a local business or equipment that no longer belongs in a workshop.
With a unit this size, think operationally from day one. Create zones for stock, equipment, packing materials and access routes. Keep a clear record of what comes in and out, particularly if more than one person uses the space. It makes the unit easier to manage and helps prevent unnecessary duplicate purchases.
How to avoid paying for the wrong size
The cheapest unit is not always the smallest one. If a compact unit forces you to stack unsafely, blocks access to valuable stock or needs replacing almost immediately, it is not the best value. Equally, a large empty unit is not a bargain simply because it was available.
Measure your largest pieces before moving day. Take note of sofas, wardrobes, mattresses, washing machines and shelving units. Dismantle what can be dismantled, keep fittings in labelled bags and protect furniture with covers or blankets. Strong, matching boxes stack more efficiently than a mixture of loose bags and damaged cartons.
Do not store items that are damp, dirty or likely to leak. Clean and dry garden equipment, defrost white goods and avoid sealing moisture inside boxes. Leave washing machines and fridges ready for storage according to their manufacturer guidance, and use breathable protection where appropriate.
Access, security and terms matter too
Size is only one part of the decision. A unit needs to work around your routine. Someone storing a house while waiting for completion may only need occasional access. A business collecting stock several times a week needs easy, reliable access and a layout that supports quick loading.
Check the provider’s access arrangements, security measures and contract flexibility before committing. Seven-day availability, 24-hour CCTV and clear terms give customers useful reassurance, but ask what applies at the specific location and to the unit you are booking. Straightforward pricing matters as well: know what the quoted rate includes and whether there are any charges beyond the storage rental.
If you are between two storage unit sizes, choose based on access rather than optimism. A well-packed unit with a usable walkway is usually the better choice, because the space should make your move or working day easier, not create another job every time you open the door.