Measure the ceiling before you buy the bed.
Will a bunk, cabin or high sleeper fit the room, and is it the right bed for your child? The headroom figure used here is 75 cm above the top mattress, a retailer guideline, not a law.
Start with the decision you are actually making
One calculator, with the assumption shown
Open the calculatorA widely published UK retailer guideline (Boori’s shorty-bunk guide, checked 13 November 2026): at least 75 cm from the top of the mattress to the ceiling so a child can sit up. It is not a legal minimum.
Guides
All 14 guidesMeasure the room
Ceiling at the bed, floor for the ladder and drawers, stairs on delivery day, and the mattress size the frame actually takes.
4 guidesBed types
Bunk, shorty, cabin, mid sleeper and high sleeper: what each one is for, and the published heights of a few real frames.
3 guidesSafety
The under-six warning, mattress depth, guard rails, and what BS EN 747-1:2024 actually covers.
1 guidesExtras
Mattresses, canopies and add-on rails: what they change about fit, and what they do not replace.