If you’ve got 20cm of clearance under your bed, look for storage boxes around 15–17cm tall, including their lids, handles and wheels. That’s a practical starting range rather than a fixed rule: the exact fit depends on the lowest point of the bed frame, floor coverings and how easily you need to slide the boxes in and out. A box advertised as 20cm high is likely to be too tight for a gap that measures exactly 20cm.
Measure the actual gap before ordering. Your bed’s advertised under-bed clearance may not account for a central support bar, a sagging frame or a thick rug.
What height storage box fits in a 20cm gap?
| Total box height | Fit in a 20cm gap | Practical advice |
|---|---|---|
| 12–14cm | Usually comfortable | Good for shoes, folded clothes and low-profile storage |
| 15–17cm | Good starting point | Leaves roughly 3–5cm clearance for easy handling |
| 18cm | Potentially tight | Only around 2cm spare; check carpet, lid and supports |
| 19cm | Very tight | Little tolerance for uneven floors or protrusions |
| 20cm or taller | Generally avoid | No spare height in a nominal 20cm gap |
These are practical fitting estimates, not product specifications. If you have a perfectly level hard floor and a fully open bed frame, an 18cm box might slide in easily. On thick carpet, a wheeled 18cm box may be awkward.
How to measure the space under your bed
- Measure from the floor to the lowest obstruction. Don’t just measure to the side rail if there’s a lower support beam farther in.
- Check several points. Measure near the entrance, towards the centre and on both sides. Beds and floors aren’t always perfectly level.
- Measure the usable width and depth. Bed legs, drawers or crossbars can divide the space into smaller sections.
- Account for carpets and rugs. A box or its wheels may sink slightly into soft flooring, increasing friction.
- Choose some spare clearance. Allow enough room to lift the box slightly and pull it out without scraping the frame.
For example, if the side rail gives you 20cm but the central support drops to 16cm where the box needs to travel, 16cm is your effective height limit—and a shorter box is sensible.
Do wheels count towards the box height?
Yes. Check whether a seller’s height measurement includes castors, raised lids and fixed handles. Sometimes a product listing shows the container body dimensions separately from its overall dimensions.
Wheeled boxes can be convenient on hard floors, but they need sufficient room for the full wheel assembly. For a narrow 20cm space, a low-profile box without wheels may give you more usable storage height.
How long and wide should an under-bed box be?
Height is only one measurement. A long box may fit under the bed but be impossible to remove because a bedside table blocks its path. Shorter boxes can be easier to handle in small bedrooms.
As an example, imagine you’ve measured a clear section that is 90cm wide and 70cm deep. A box measuring 75 × 50 × 16cm could fit within that footprint, provided there’s enough room at the side to slide it out. A 95cm-long box wouldn’t fit even though its height was suitable.
Don’t use mattress dimensions alone to work out how many boxes will fit. Bed frames, legs and support bars take up space.
Are fabric under-bed bags better than plastic boxes?
Both can work, but they’re useful for different things:
- Rigid plastic boxes: Help protect contents from dust and crushing, and clear sides make belongings easy to identify. Check the overall height with the lid fitted.
- Fabric storage bags: Can be easier to manoeuvre through a narrow gap and are useful for clothing or spare bedding. They may bulge above their stated dimensions when overfilled.
- Vacuum storage bags: Compress suitable textiles and can work in shallow spaces, but the final thickness varies with what’s inside. Check the care recommendations for duvets and delicate fabrics.
If there’s a damp or condensation problem under your bed, resolve that before storing textiles there. Even a sealed container shouldn’t be treated as a substitute for a dry storage environment.
Can you fit 20cm-high boxes under a bed with 20cm clearance?
Not reliably. A nominal 20cm gap leaves no tolerance at all. The lid might protrude, the floor may not be level and you may need to lift the box as you pull it out.
It’s tempting to use every centimetre of space, but a box that’s difficult to retrieve soon becomes annoying. A slightly lower container is usually the more practical purchase.
Where to buy low-profile under-bed storage boxes
Once you’ve measured your available height, width and depth, you can browse approximately 15cm-high under-bed storage boxes on Amazon UK or look at low-profile fabric storage bags.
These are general shopping searches, not verified recommendations. Check the complete external dimensions in each listing—particularly wheels and lids—before ordering.
Frequently asked questions about what size storage boxes fit under a bed with 20cm clearance
Will an 18cm storage box fit under a bed with a 20cm gap?
It might. You’ll have only about 2cm of nominal clearance, so measure the lowest obstruction and check whether the box’s quoted height includes the lid and wheels.
How much clearance should I leave above under-bed storage?
For an easy-to-use setup, aiming for roughly 3–5cm of spare space is a sensible starting point. You may need more if the floor is uneven or you have thick carpet.
Does a bed with 20cm legs have 20cm of storage clearance?
Not necessarily. Side rails, central supports and fittings can extend below the top of the legs. Measure from the floor to the lowest obstruction in the box’s path.
Are wheeled under-bed boxes suitable for carpet?
Some are, but small wheels can be hard to move on thick carpet. A lightweight box with a smooth base may be easier to slide, depending on the flooring.
Can I store a duvet under a bed with 20cm clearance?
Possibly. A suitable low-profile fabric bag or vacuum storage bag can help, but the required space depends on the duvet’s size, filling and thickness. Check its care label before compressing it for long-term storage.
Bottom line
For a bed with 20cm clearance, start by looking at boxes around 15–17cm high. Measure the lowest point under your bed, then check the complete exterior dimensions of the container. Leaving a few centimetres of spare height is usually worth more than squeezing in the tallest possible box.
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