What age is safe for a top bunk?

BS EN 747, the UK and European safety standard, sets the floor at 6 years for the top bunk. Most UK retailers state the same on product pages. Below 6, the standard says the child should not sleep on the top regardless of the model.

How tall is a bunk bed?

Most domestic bunk beds are 150-170cm to the top of the upper mattress, with 65-90cm between the two mattresses. Check ceiling clearance: you want at least 65cm above the top mattress so a child can sit up. Standard UK bedroom ceilings are 2.4m, which fits comfortably.

What's the weight limit on a bunk bed?

UK domestic bunks tested to BS EN 747 typically carry 60-90kg per bunk depending on build (pine commonly 60kg, hardwood up to 120kg). Adult-rated bunks tested to 150kg+ exist but cost more. Check the manufacturer spec line before assuming an older sibling can use the top.