Best Mattress for Bunk Beds in South Africa
If your child sleeps on the top bunk, the mattress you choose is a safety decision as much as a comfort one. Bunk beds built to the EN 747-1:2024 safety standard, the standard most South African-made bunk frames are built to, require the top of the mattress to sit at least 160mm (16cm) below the top of the guardrail. Put a mattress that is too thick on that top bunk and the guardrail stops doing its job, even though the mattress technically fits the frame's length and width. This guide covers three things directly: what thickness actually works with your specific guardrail, with the arithmetic not a guess, when a regular single mattress is genuinely fine for a bunk and when it is not, and what to buy once your child has outgrown the bed rather than just the mattress. We publish our own mattress's height, density and warranty rather than asking you to take "supportive" on faith: our Comfort Foam Single now comes in two heights, an 18cm standard build and a 150mm Bunk Bed Height, both 50 kg/m3 SABS-approved foam with a 3 year warranty, both R2,399.
The guardrail arithmetic, worked examples
There is no confirmed South African national standard (SANS) number specifically for bunk bed guardrail clearance. What exists, and what most South African-made bunk frames are built to, is EN 747-1:2024, a European standard. Under it, the top of the top-bunk mattress must sit at least 160mm (16cm) below the top of the fall-protection guardrail, and the gap between the guardrail and the frame cannot exceed 7.5cm (to stop a child's head becoming trapped).
The formula that matters: guardrail height above the bed base, minus 16cm, equals your maximum safe mattress thickness.
| Guardrail height above the base | Maximum safe mattress thickness |
|---|---|
| 40cm | 24cm |
| 34cm | 18cm (our standard Comfort Foam Single height) |
| 31cm | 15cm / 150mm (our Bunk Bed Height Comfort Foam) |
| 30cm | 14cm, meaning even a 15cm mattress would slightly exceed it |
These are illustrative guardrail heights to show how the formula works, not measurements taken from one specific named frame. Measure your own guardrail before you buy: from the top bunk's base (where the mattress sits) to the top of the guardrail rail, in centimetres.
Foam mattress comparison: height, density and price
All figures below are pulled from our live product pages at the time of writing. Where a figure is not published for a model, we say so rather than guess.
| Model | Height | Density | Single price, mattress only | Warranty |
|---|---|---|---|---|
| Comfort Foam, standard build | 18cm (150mm foam core + cover) | 50 kg/m3 | R2,399 | 3 years |
| Comfort Foam, 150mm Bunk Bed Height | 150mm (15cm) | 50 kg/m3 | R2,399 | 3 years |
| Active Foam | Not published in mm | 50 kg/m3 | R3,399 | 10 years |
| Revive Memory Foam | Not published in mm | 65 kg/m3 | R4,899 | 10 years |
For a bunk bed specifically, height is the constraint that matters most, not just density. Active Foam and Revive are firmer and denser builds respectively, but as of writing we do not publish a total height in millimetres for either, so if your guardrail clearance is tight, the Comfort Foam range is the one where we can tell you the exact number to check against your own measurement.
Best for a tight guardrail (under 34cm clearance)
Comfort Foam 150mm Bunk Bed Height. At 15cm total, it clears the EN 747-1 arithmetic down to a 31cm guardrail, R2,399, Single, mattress only.
Best for a guardrail with plenty of clearance (34cm or more)
Either Comfort Foam height works. If you would rather have a firmer feel for an older or heavier child, Active Foam's 50 kg/m3 firm build is the next step up, though confirm your own guardrail height first since we do not publish its total thickness in mm.
Best for a bottom bunk (no guardrail constraint)
Any of the four models above will fit a bottom bunk safely, since the guardrail rule only applies to the top bunk. Revive Memory Foam at 65 kg/m3 is a genuine upgrade in feel if the bottom bunk is also a parent's occasional guest bed.
We checked what South African bunk retailers publish. Most publish nothing on this.
We looked at the most-cited South African site for "best mattress for bunk bed South Africa" across independent answer-engine searches. It sells a proper solid pine bunk frame with a real weight rating and a frame warranty, in the correct 91cm x 188cm Single dimension. But its mattress is offered only as a generic "high-density foam mattress" add-on, with no published thickness, no published density, and no guardrail-safety language anywhere on the page. We could not find any South African bunk retailer in this research that publishes the arithmetic above. We would rather publish the numbers and let you check them against your own frame than ask you to trust a generic description.
When has your child outgrown the bed, not just the mattress?
A simple, honest rule: a bed is outgrown when your child's head and feet come within 10cm of either end. That means usable length is the mattress length minus 20cm.
Worked example: our Single is 188cm long. 188cm minus 20cm equals 168cm. A child around 168cm tall has effectively outgrown a 188cm Single bunk bed, regardless of how the mattress itself is holding up. At that point the fix is a longer bed, not a different mattress on the same frame.
Why we build two heights instead of one
Most mattress makers build one height per model and leave bunk bed buyers to work out the guardrail arithmetic themselves, or simply hope the mattress fits. We took the opposite approach. Once we worked through the EN 747-1:2024 numbers properly, it was clear that a single 18cm Comfort Foam is genuinely too thick for a meaningful slice of the bunk frames sold in South Africa, frames with a guardrail sized for something closer to 15cm. Rather than tell parents to buy a mattress that might defeat their own child's safety rail, we built a second height at the same foam grade, the same density, the same warranty and the same price. The only thing that changes between the two is the one number that actually matters for a bunk: total thickness.
This also means you are never paying more for the safer option. R2,399 buys either height, Single, mattress only. The decision is entirely about your guardrail measurement, not about trading comfort or durability for safety.
Common mistakes parents make when buying a bunk bed mattress
Mistake 1: measuring the mattress, not the guardrail
It is natural to check whether a mattress is "the right size" by its length and width. But length and width tell you nothing about whether the guardrail will still protect your child once the mattress is on the bed. The measurement that matters for safety is the vertical one: guardrail height above the base, and mattress thickness.
Mistake 2: assuming thicker always means better
A thicker mattress is not automatically a more comfortable or more supportive one, and on a bunk bed a thicker mattress is a real safety trade-off. Density and build quality, not thickness alone, determine how a foam mattress feels and how long it lasts. Our 150mm Bunk Bed Height uses the same 50 kg/m3 foam as our standard build, so you are not sacrificing support to get the safer thickness.
Mistake 3: buying the cheapest thin pad available
A thin mattress solves the guardrail problem but creates a new one if it is cheap, low-density foam that sags and loses its shape within months. The two failure modes at the top of this guide, the thin sagging pad and the too-thick mattress, are both real, and the fix for one should not create the other. Checking both density (ours is 50 kg/m3, SABS approved) and thickness before you buy avoids swapping one problem for the other.
Mistake 4: not checking the warranty term against the actual product
Warranty terms genuinely differ between mattress lines, even within the same brand. Our Comfort Foam range carries a 3 year warranty, shorter than our Active Foam, Revive or Hybrid ranges at 10 years, because it is a different, lower-cost construction built for a different budget and use case. Always check the warranty term specific to the exact model and height you are buying, not just the brand name.
Delivery, nationwide
Both Comfort Foam heights are manufactured across our own South African factories and delivered free nationwide, with delivery to extreme rural areas carrying a small fee. Wherever you are in South Africa, we can get either height to you; tell us your area when you order and we will confirm your specific delivery window.
A closer look at EN 747-1:2024
EN 747-1 is a European furniture safety standard covering bunk beds and high beds, most recently updated in 2024. It sets requirements for the strength of the frame, the ladder, the guardrails, and the gaps between components, with the guardrail clearance rule being the one most relevant to choosing a mattress. The standard's logic is straightforward: a guardrail exists to stop a sleeping child rolling off the top bunk, and it can only do that if enough of it stands proud above the mattress surface. Put the mattress too high, whether by using too thick a mattress or by stacking a topper on top of a mattress that was already at the limit, and the guardrail's effective height above the sleeping surface shrinks, sometimes below the point where it can catch a rolling child at all.
South Africa does not currently have its own published national standard (SANS) number specifically addressing this measurement. In its absence, the honest, verifiable reference point is EN 747-1:2024 itself, which is why we cite it directly rather than inventing a local standard number that does not exist. If a local SANS equivalent is published in future, we will update this page to reference it specifically.
One practical note for toppers: if you plan to add a mattress topper to a top bunk mattress, measure with the topper in place, not just the bare mattress. A topper adds real thickness and can turn a compliant setup into a non-compliant one.
Per-region delivery
Mr Mattress manufactures across six South African regions (Gauteng, Cape Town, East London, Bloemfontein, Durban and Mpumalanga) and delivers nationwide, not from a single regional base. Wherever you are ordering from, tell us your area at checkout or on WhatsApp and we will confirm your specific delivery window for either Comfort Foam height.
Frequently asked questions
What thickness should a bunk bed mattress be?
Take your guardrail height above the bed base and subtract 16cm (the EN 747-1:2024 minimum clearance). The result is your maximum safe mattress thickness. Our Comfort Foam Bunk Bed Height option is built at 150mm (15cm) specifically to fit tighter guardrails.
Is EN 747-1 a South African legal requirement?
No. There is no confirmed South African national standard (SANS) number for bunk bed guardrail clearance. EN 747-1:2024 is a European standard that most South African-made bunk frames are commonly built to, and we cite it by name only, not as SA law.
Can I use a regular mattress on a bunk bed?
Sometimes, yes, if your guardrail clearance is generous enough for its height. See our dedicated article on this exact question, linked below, for the full yes and no cases.
How do I know when my child has outgrown their bunk bed?
When their head and feet come within 10cm of either end of the mattress. For a 188cm Single, that is around 168cm tall.
Do both Comfort Foam heights cost the same?
Yes. Both the 18cm standard build and the 150mm Bunk Bed Height are R2,399 for a Single, mattress only, with the same 50 kg/m3 foam, 3 year warranty, and 365 night trial.
Related: Best mattress for bunk beds, the landing page · What thickness should a bunk bed mattress be · Can I put a regular mattress on a bunk bed · Kids mattresses
Reviewed by Andries Taljaard, Founder of Mr Mattress.