Garden storage boxes: what fits and what to measure

Buy a garden box by the shape of its usable interior, rather than its litre capacity. Check the longest item first, then decide whether you want top access, front access or both.

External size isn't storage space

For example, Keter lists its Store It Out Midi as 132 × 71.5 × 113.5 cm externally, but 122 × 61 × 108.8 cm internally, in width × depth × height order. These manufacturer-stated figures were checked on 25 October 2026. They illustrate why a box that fits the patio may still be too small for the contents.

The size of the opening matters too. An internal width alone doesn't prove that a rigid object can pass through the doors. Where the maker doesn't publish the clear opening, ask before buying.

Measure the space with the box open

Use tape or cardboard to mark the footprint. Allow the lid to open beneath a window, fence rail or overhanging branch. Front doors should open without blocking the route through the garden. Include the space you need to stand while loading the box.

For tools used daily, avoid a layout that leaves the item you want underneath a pile of other equipment. A shelf can help, but only where the maker permits one and provides suitable supports.

Read the small print on use

Check the assembly instructions, base requirements, floor load and permitted uses. Don't use a lid as a seat unless the particular model is designed for it. A padlock point doesn't establish a tested security rating.

If your longest tool cannot lie flat without forcing the lid, consider a tall store or small shed. Use the planner to record your own measurements before comparing models.