Bunk Bed Mattress Safety Standards Every UK Parent Should Know
UK parents buying mattresses for bunk beds must follow BS EN 747 for the bed frame and BS 7177 for the mattress to meet legal fire safety and guard-rail requirements. The top-bunk guard rail must rise at least 16 cm above the mattress surface, so the maximum mattress depth stated by the bunk bed maker must never be exceeded.
BS EN 747 – The Core Bunk Bed Standard
Every bunk bed sold in the UK must comply with BS EN 747. This standard sets strict rules on guard rails, ladder strength, headroom and overall construction. For the top bunk the guard rail must extend a minimum of 16 cm above the top of the mattress. This is why manufacturers publish a maximum mattress depth. Using a thicker mattress reduces the effective guard-rail height and breaches the standard.
Always check the specific bunk bed’s product page for its stated maximum mattress depth before ordering. Browse our range of Bunk Beds (117 in stock) that already state these limits clearly.
Practical Checklist Before Purchase
- Confirm the bunk bed carries a permanent BS EN 747 label.
- Measure the mattress depth you intend to buy and compare it against the bed maker’s maximum.
- Ensure at least 9 cm clearance remains between the top of the mattress and the bottom of the upper bunk slats if a child sits up.
- Top bunks are not recommended for children under 6 years old.
BS 7177 and Fire Safety Regulations for Mattresses
All mattresses sold in the UK must meet the Furniture and Furnishings (Fire) (Safety) Regulations 1988, tested to BS 7177. This applies equally to kids’ mattresses used on the top or bottom bunk. Look for the permanent label that confirms the correct ignition resistance level – usually “medium” or “high” hazard for domestic use.
Flame-retardant barriers are used inside the mattress rather than chemical treatments on the surface. This keeps the product safe without compromising comfort. See all Kids’ Mattresses (35 in stock).
Choosing the Right Mattress Depth for Top Bunks
Most wooden and metal bunk beds allow a maximum mattress depth of 15 cm on the top bunk to maintain the 16 cm guard-rail height. Using a deeper mattress on a bed rated for 15 cm would leave less rail above the sleep surface – a clear safety breach.
For lower bunks the depth limit is often higher because there is no guard-rail requirement, but matching both mattresses simplifies rotation and replacement. A common safe choice is a 12–15 cm depth for the top and the same or slightly deeper for the bottom.
Mattress Types Suitable for Bunk Beds
Open-coil and pocket-sprung mattresses offer good airflow and are often lighter to lift onto upper bunks. Memory foam and hybrid options provide pressure relief but can be heavier. For children, many parents prefer a medium-firm feel that supports growing spines without being too soft.
Waterproof covers or mattresses with built-in protection are practical for younger users. Noomi Waterproof Eco Foam Mattress Single is a popular choice because the name confirms its waterproof and eco-friendly construction, ideal for bunk beds where spills are common.
Medium Firm Mattresses (51 in stock) give a balanced feel that works for most school-age children on both top and bottom bunks.
Size Guidance for UK Bunk Beds
Standard UK bunk beds are built for single-size mattresses: 90 x 190 cm (3 ft). Some shorty bunk beds use 75 x 190 cm (2 ft 6 in) or shorter lengths for smaller rooms. Always measure the bed base exactly – UK and EU sizes differ (EU single is 90 x 200 cm).
| Mattress Type | Dimensions | Typical Bunk Use |
|---|---|---|
| Small Single | 75 x 190 cm (2 ft 6) | Shorty or compact bunk beds |
| Single | 90 x 190 cm (3 ft) | Most standard UK bunk beds |
| Cot Bed / Toddler | 70 x 140 cm | Lower bunk transition for younger siblings |
Choose the correct size to avoid gaps at the sides or ends that could create entrapment hazards. Single Mattresses (127 in stock) are the most common choice for bunk beds.
Additional Safety Rules and Best Practice
Never place a bunk bed near windows, radiators or ceiling fans. Ensure the ladder is securely fixed and that children are taught to use it facing the rungs. Check all fixings every six months. For triple bunk beds or L-shaped designs the same 16 cm guard-rail rule applies to every upper sleeping level.
When replacing mattresses, keep the original depth or thinner. A Maxitex Premier Sprung Mattress offers a supportive sprung construction that many parents choose for the bottom bunk of larger models, provided the depth matches the bed’s specification.
Flair wooden bunk beds are designed and tested to BS EN 747; always read the exact maximum mattress depth on each product page. Wooden Bunk Beds (99 in stock).
Common Mistakes to Avoid
- Buying a thick pillow-top mattress for the top bunk without checking depth limits.
- Assuming all single mattresses are interchangeable – depths vary from 10 cm to 25 cm.
- Using adult-sized king or double mattresses on children’s bunk beds.
- Ignoring the fire label – non-compliant mattresses are illegal to sell or use in the UK.
Following these standards keeps children safe while they sleep. Take measurements, read labels and choose reputable brands that clearly state compliance.
Our picks for this guide
- Noomi Waterproof Eco Foam Mattress Single – Waterproof construction makes it practical for bunk beds used by children while meeting UK fire safety standards.
- Maxitex Premier Sprung Mattress - Double Continental – Sprung support suitable for lower bunks where deeper mattresses are often permitted under BS EN 747 rules.
- Flair Fern Bunk Bed White & Oak – Designed to BS EN 747 with clearly stated maximum mattress depth to keep the 16 cm guard rail requirement.
- Noomi Kayla Bunk Bed with Storage White – FSC-certified bunk bed tested to current UK safety standards and supplied with clear mattress depth guidance.
Frequently asked questions
Can I use a memory foam mattress on a top bunk?
Yes, provided the depth does not exceed the bunk bed manufacturer’s stated maximum. This ensures the guard rail still rises 16 cm above the mattress surface as required by BS EN 747. Check the exact depth on the product page before ordering.
What is the legal minimum guard rail height for UK bunk beds?
BS EN 747 requires the top of the guard rail to be at least 16 cm above the top surface of the mattress. This measurement is taken with the mattress the bed maker recommends, so never exceed the published maximum mattress depth.
Are all kids mattresses fire resistant?
All new mattresses sold in the UK must meet BS 7177 fire safety tests under the 1988 Furniture Regulations. Look for the permanent label on the mattress stating the hazard level – domestic use normally requires medium or high.
Is it safe to put a 20 cm deep mattress on a bunk bed?
Only if the bunk bed manufacturer explicitly states a 20 cm maximum depth. Most standard models limit the top bunk to 15 cm or less to maintain the 16 cm guard rail height. Using a deeper mattress creates a safety risk.
Do shorty bunk beds have different mattress rules?
The same BS EN 747 and BS 7177 rules apply. Shorty bunk beds usually take 75x190 cm (2ft6) mattresses. Always confirm the exact maximum depth allowed for the top bunk on the product page.
Related guides
- Bunk Bed Mattress Weight Limits: What You Need to Know
- How to Protect a Bunk Bed Mattress from Dust and Mites
- Bunk Bed Mattress Thickness Guide: What Depth is Best?
- How Much Depth Clearance Do You Need for a Bunk Bed Mattress?
- Best Mattress Toppers for Kids Bunk Beds to Add Comfort
- Best Mattress for Bunk Beds UK: Top Picks for Comfort and Safety