Best bunk beds
A bunk bed's guard rail height is measured from the top of the mattress, which is why mattress depth is a safety limit rather than a preference.
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The rule that governs the whole purchase
A guard rail has to stand a minimum height above the top of the mattress, not above the bed base. Every centimetre of extra mattress depth is a centimetre off the effective rail height.
That is why frames state a maximum mattress depth, commonly around 15 centimetres, and many print a fill line on the inside of the frame. Do not exceed it.
Everything else follows from that. You are not choosing a mattress for comfort and then checking it fits; the depth limit chooses the mattress and you work within it.
Look for compliance with the UK bunk bed standard, BS EN 747, which covers rail heights, gap sizes and structural strength. A frame that states it is worth more than one that describes itself as sturdy.
The picks
The pick, if you want one answer
Simba Hybrid Kids Mattress, 7.6 / 10. Built for a child's weight at a depth that works inside a bunk frame, with waterproofing designed in.
| Product | Best for | From | Score |
|---|---|---|---|
| Simba Hybrid Kids Mattress | Best mattress for a bunk | Mid range | 7.6 / 10 |
| Rem-Fit Kids Mattress | Best value | Budget to mid | 7.5 / 10 |
| Silentnight Sleep Now Range | Cheapest sensible option | From £169 | 6.7 / 10 |
Simba Hybrid Kids Mattress: Best mattress for a bunk
Mid range · 7.6 / 10
Scores 7.6. Check the depth against the frame's stated maximum before ordering. In a bunk, waterproofing and a washable cover matter more than spring count, because a child barely compresses a mattress and stripping a top bunk at 3am is difficult enough already.
Buy it if
You need a children's mattress that fits within the frame's depth limit.
Do not buy it if
The frame's stated maximum is lower than the mattress depth.
Read the full Simba Hybrid Kids Mattress review
Rem-Fit Kids Mattress: Best value
Budget to mid · 7.5 / 10
Scores 7.5. Rem-Fit's eligibility schemes are unusually broad, covering key workers, seniors and students, which can change the price more than the specification gap at this end of the market.
Buy it if
You want a sensible children's specification at a lower price.
Do not buy it if
You need the absolute lowest price.
Read the full Rem-Fit Kids Mattress review
Silentnight Sleep Now Range: Cheapest sensible option
From £169 · 6.7 / 10
From a manufacturer trading since 1946. At shallow depths, firm is what makes a thin mattress work: you are not sinking far, so there is less need for the structure a thicker mattress provides.
Buy it if
You need a shallow mattress from a manufacturer that will still exist.
Do not buy it if
You want a deeper mattress. A bunk will not take one.
Read the full Silentnight Sleep Now Range review
The safety checks, in order
| Check | Why |
|---|---|
| Maximum mattress depth, stated | The guard rail height is measured from the mattress top |
| BS EN 747 compliance | The UK standard covering rail heights, gaps and strength |
| Guard rails on all four sides of the top bunk | Including where the ladder meets the frame |
| Ladder fixed, not hooked on | A ladder that can shift is the commonest fall risk |
| Gaps between rails and frame | A trapping hazard, particularly at the head and foot |
| Slat spacing under both bunks | No more than about 7.5cm, or the mattress sags and the guarantee is void |
Two further points that frames rarely make prominent. Top bunks are generally not recommended for children under six, and manufacturers state a minimum age. And there are weight limits for each bunk, which matter if an adult will ever sleep on the top one.
Measure the room, and the ceiling
Headroom above the top bunk is the measurement people forget. A child needs to be able to sit up without hitting the ceiling, and a light fitting directly above a top bunk is a problem.
Access. Assembled bunk frames do not go through doorways or round stair turns, so they are built in the room. Check the flat pack cartons fit the route in.
Floor levelling. A bunk on uneven boards rocks, which is unsettling at height and loosens fixings faster. Felt pads or shims fix it.
Clearance for the ladder and space to strip the top bunk, which is harder than it looks from the shop floor.
Construction, and why it matters more here
A bunk carries load at height and gets climbed on, so joints work loose faster than on an ordinary bed.
Bolts into solid timber, or metal into metal, hold rigidity far better than cam lock fittings, which loosen in the same hole each time. Most bunk frames are metal for exactly this reason: strength for weight.
Tighten every fixing at six months and then twice a year. A creaking bunk is almost always a loosened joint, and on a bunk that is a safety matter rather than an annoyance.
On metal frames, nylon or rubber washers at metal-to-metal joints stop the grinding noise that keeps children awake.
Bedding for a top bunk
A waterproof protector, fitted before the first night, and buy two. Stripping a top bunk is awkward at any hour and impossible to do quickly at 3am without a spare.
A fitted sheet that actually grips. Making a top bunk is done at arm's length, and a sheet that is a few centimetres too shallow will come off nightly.
A 7 to 10.5 tog duvet. Heat rises, so the top bunk is warmer than the bottom one, and the same tog will not suit both children.
A child-height pillow. Children need far less height than adults because their shoulders are narrower, and an adult pillow holds a small neck in flexion all night.
What not to do
Exceed the stated maximum mattress depth. It is a guard rail calculation.
Put a child under six on a top bunk, and check the manufacturer's stated minimum age.
Add a topper to a bunk mattress. It raises the sleeping surface, which is the one thing you cannot do.
Buy a frame that only describes itself as sturdy. Look for BS EN 747.
Skip the six-monthly tightening. On a bunk this is a safety task.
Also considered, and why they are not here
A roundup is only as useful as what it leaves out, so here is what was assessed and rejected for this list.
| Product | Why it is not on the list |
|---|---|
| Emma Original Lite | Excellent at £199, and check the depth against the frame's stated maximum before assuming it fits a bunk. |
| Mlily Memory Gel 200 | Scores 5.5. Shallow foam without published density, which is the specification that would tell you how long it lasts. |
| Panda Kids Pillow | A pillow rather than a mattress, and the cheapest improvement most children's beds can have, because adult pillows are far too high for a child. |
| Simba Hybrid Cot Bed | For a cot rather than a bunk. Cot mattresses follow safer sleep guidance, which is a separate set of rules entirely. |
How this list is made, and who made it
Independence
No brand pays to appear on this site and no placement is sold. Some links earn a commission if you buy, which never changes a score, an order or a verdict. Several of the lowest scores here are on products that carry commission, and several recommendations carry none.
Who writes this. Kyle Klinkradt has worked in the mattress and bedding industry for over ten years across retail, distribution and brand partnerships, and has handled, sold or assessed products from every major UK bed-in-a-box brand. Every review on this site is written by one person, so the scores mean the same thing from page to page.
What the assessment is. Construction specifications against what they physically do: spring height and where in the mattress it sits, spring count for the size, gauge, whether the base is sprung or foam, foam density where it is published, comfort layer depth and material. Then the commercial terms that decide what you are actually buying: trial against returns policy, guarantee length against the company's UK trading history at Companies House, and the regulatory record.
What it is not. This is not a laboratory. I do not publish pressure-mapping data or claim to have slept eight years on every mattress here, because nobody has and pages that imply otherwise are not telling you the truth. Where a judgement rests on construction rather than long-term use, the review says so.
What gets a product removed. Leaving the UK market, a specification change that makes the review inaccurate, or a corrected fact. Brands that have withdrawn are kept on the site with the score removed rather than quietly deleted, because people still search for them.
See editorial independence, corrections and the author page.
How these were chosen
Every product here has its own review on this site with a score out of 10, and the score is a judgement rather than an average. Nothing appears in a list because it pays more.
A score is against the market, not against its own range. The cheapest mattress in a lineup is usually priced to make the model above it look reasonable, and the flagship of a budget range has risen into a bracket where better brands compete. Both are judged against what else you could buy for the money.
Everything listed can actually be bought in the UK. That is not a given: Casper withdrew in July 2020 and Leesa no longer sells here, and both still appear in current British roundups with affiliate links attached.
I do not pad the list. Where only three or four products genuinely qualify, there are three or four. A list of seven when the category contains four good ones is a list with three bad recommendations in it.
Prices move constantly. Judge the cash price on the day rather than any percentage beside it. See every review on this site or where the real savings are.
Questions people ask
What mattress depth can I use on a bunk bed?
Whatever the frame states as its maximum, commonly around 15 centimetres. A guard rail has to stand a minimum height above the top of the mattress, so every extra centimetre of depth is a centimetre off the effective rail height.
What safety standard should a UK bunk bed meet?
BS EN 747, which covers guard rail heights, gap sizes and structural strength. A frame that states compliance is worth more than one that describes itself as sturdy.
What age can a child sleep on a top bunk?
Top bunks are generally not recommended under six, and the manufacturer will state a minimum age. There are also weight limits for each bunk, which matter if an adult will ever sleep on the top one.
Can I put a mattress topper on a bunk bed?
No. A topper raises the sleeping surface, which reduces the effective guard rail height, and that is the one thing a bunk bed does not allow.