Bunk Beds
The best bunk beds with trundles
A trundle turns a two-child bed into a three-child bed for the price of a mattress. The catch is a thickness limit almost nobody reads, and it is not the same limit as the bunks above it.
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Quick picks
The short version. Tap any row for the full write-up and its spec block.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | Max & Lily Twin Over Twin Bunk Bed With Trundle The only trundle bunk we found that publishes a rail height, a per-surface weight limit and a separate mattress ceiling for the trundle itself. | A shared room that hosts a third child most weekends | 8.7 | |
| 2 |  Max & Lily Modern Farmhouse Twin Over Twin Bunk Bed With Trundle The shortest and shallowest trundle bunk here, and the only one that tells you the top bunk caps out at seven inches of mattress. | Rooms with a low ceiling or a tight wall run | 8.4 | |
| 3 |  Max & Lily Twin Over Twin Bunk Bed With Stairs & Trundle Stairs with storage built into them, plus a third bed underneath — and a footprint that will not fit the small room this is usually bought for. | A younger child who should not be on a ladder at night | 8.3 | |
| 4 |  Max & Lily Twin Over Full Bunk Bed With Trundle Three beds, one of them full size, which makes this the only pick here an adult can sleep in without checking a sticker first. | A room that has to hold a guest, not just a friend | 8.2 | |
| 5 |  Harper & Bright Designs Twin Over Twin Bunk Bed With Trundle and 3 Drawers A trundle and three drawers under one frame at well under the price of the solid-pine specialists, with a published weight limit and nothing else. | A small room that needs storage and a spare bed | 7.4 | |
| 6 |  Harper & Bright Designs Twin Over Twin Metal Bunk Bed With Trundle The cheapest way into three beds, and the only budget pick here that publishes its rail height and its mattress ceiling together. | A guest room or a tight budget | 7.0 | |
| 7 |  Donco Kids Austin Mission Twin Over Twin Bunk Bed With Twin Trundle Solid pine in a mission style that does not look like children's furniture, with a weight limit published and nothing else. | A room the child will not outgrow the look of | 6.8 |
How we chose
We are a small publisher, not a testing lab. We don’t buy, assemble or sleep in the beds we write about, and we won’t pretend otherwise. What we do instead is read the published specifications and check them against the rules that actually govern children’s beds in the United States: the federal standard for children’s bunk beds (16 CFR Part 1513), the ASTM F1427 requirements it incorporates, and the American Academy of Pediatrics’ guidance on upper-bunk age. Where a manufacturer publishes no number, we write “not published by the manufacturer” rather than guess — that absence is itself worth knowing. We read owner feedback at volume for the things specs can’t tell you, and we label it as signal, not proof.
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A trundle is the cheapest third bed you will ever buy. The frame is already there, the floor space is already spoken for, and the only thing you add is a mattress that rolls away in the morning. For a shared room that hosts a cousin every school holiday, it solves a problem an air bed solves badly.
It also introduces a number that trips up more buyers than any other in this category: the trundle has its own mattress-thickness ceiling, and it is usually much lower than the one for the bunks above it. The beds on this page that publish an eight-inch limit for the top and bottom bunks publish a five-inch limit for the trundle. Buy one mattress in three and one of them will not fit under the bed.
The criterion this page ranks on
The same one every roundup on this site uses: what the manufacturer is willing to publish. Four numbers, on every bed — guardrail height above the deck, stated weight limit per sleeping surface, manufacturer minimum age, and the mattress-thickness ceiling. On a trundle bunk we look for a fifth, because it is the one that decides whether the third bed works at all: a separate thickness limit and weight rating for the trundle itself.
That criterion matters more here than on a plain bunk because the federal guardrail rule is measured above the mattress, not above the frame. A rail height without a mattress ceiling is half a specification. A trundle bunk sold with neither is a bed whose compliance you have to establish yourself, with a tape measure, after you have paid for it.
Why a trundle bunk is never a low bunk
This surprises people who come to trundles from our low bunk roundup, and the reason is pure geometry. A low bunk earns its name by dropping the bottom deck almost to the floor, which is what shortens the fall from the top. A trundle needs that space: it is a mattress on a frame on castors, and it has to slide underneath the bottom bunk and stay there.
So the two features are mutually exclusive in practice. Every bed on this page stands between roughly 63 and 65 inches tall, against about 50 inches for a typical low bunk. If the reason you were looking at bunk beds is that your child is young and the top deck worries you, the trundle is not the feature to solve it — the answer is the low bunk, with the third child on an air bed for the two nights a year it comes up. Read top-bunk age readiness before you decide, because the American Academy of Pediatrics advises that no child under six sleeps on an upper bunk regardless of which frame you buy.
What to measure before you buy
The floor beside the bed, not just under it. A trundle adds nothing to the closed footprint and roughly a full mattress width to the open one. A twin trundle pulled out from a twin-over-twin bunk occupies about the same floor area as two separate beds while it is in use. That is fine if it is in use twice a month. It is a planning error if the trundle is somebody’s actual bed.
Three mattress thicknesses, not one. Write down the published ceiling for the top bunk, the bottom bunk and the trundle before you order anything soft. They are frequently three different numbers on the same bed, and the trundle’s is always the smallest.
Floor type. Some trundles roll on castors and some are a drawer-style box that slides. On carpet, the difference decides whether a child can pull the bed out unaided or whether an adult has to do it every time.
Ceiling height and clearance above the top deck. A trundle bunk is a standard-height bunk, so the top sleeper wants somewhere around two feet of clear air above the mattress. Our sizes and dimensions guide has the full set of footprints and clearances.
How the picks compare on published numbers
| Bed | Guardrail height | Weight limit | Trundle mattress ceiling |
|---|---|---|---|
| Max & Lily twin over twin + trundle | 14 in | 400 lb per surface | 5 in |
| Max & Lily Modern Farmhouse | 13.5 in | 400 lb per surface | 5 in |
| Max & Lily stairs + trundle | 14 in | 400 lb per surface | 5 in (6 in max) |
| Max & Lily twin over full + trundle | ~14 in | 400 lb per surface | 5 in (6 in max) |
| Harper & Bright trundle + drawers | Not published | 400 lb per bunk | Not published |
| Harper & Bright metal trundle | 12.8 in | 220 / 220 / 200 lb | Not published |
| Donco Austin Mission + trundle | Not published | 220 lb per bunk | Not published |
Four of the seven publish a guardrail height. Four publish a trundle mattress limit. Only the budget metal frame publishes a rail height and a per-deck mattress recommendation at the bottom of the price range, which is worth saying plainly because it is the opposite of what you would expect.
What the trundle itself is rated for
Every bed here publishes something about the bunks. Far fewer publish anything about the trundle, and the two ratings are not interchangeable. A frame rated 400 lb per sleeping surface is describing the upper and lower bunks, which are bolted into the structure; the trundle is a separate unit on castors with its own slat deck, and it carries whatever it carries.
Only one pick on this page states a number for it outright — the budget metal frame, at 200 lb for the trundle against 220 lb for each bunk. The pine specialists publish a mattress ceiling for the trundle but not a weight limit, and the two cheapest wood frames publish neither. If the trundle is going to hold a visiting adult rather than a seven-year-old, that silence is the thing to resolve before you buy, not after. Our guide to bunk bed weight limits covers how these figures are stated and what they do and do not cover.
What decides price in trundle bunks
Frame material first, exactly as in the rest of the category. Solid pine with metal-on-metal bolt connections sits at the top of the range and holds its tension for years. A powder-coated steel tube frame with the same three sleeping surfaces costs a small fraction of that, is fully compliant, and needs its fasteners re-checked every few months as they settle. Pine mixed with MDF sits between the two and is the least tolerant of being taken apart and rebuilt, which matters if you move often.
Then the trundle mechanism. A castored trundle unit with its own slat deck is a piece of furniture in its own right and priced like one. A drawer-style box that doubles as storage is cheaper and harder to move when it is loaded. Storage drawers in the same frame add again, and a staircase adds roughly what a plain metal bunk costs on its own — see stairs vs ladder for whether that trade is worth making in your room.
What does not vary much with price is safety compliance. Every children’s bunk bed sold in the United States has to meet the same federal standard. What you buy as you spend more is published information, higher stated capacity, and a frame that survives being disassembled — not a fundamentally safer bed.
The mistake almost everyone makes
Buying three identical mattresses. It feels efficient and it fails twice: the trundle will not close with a standard eight- to ten-inch twin mattress on it, and a mattress chosen for the trundle is too thin to be comfortable as anyone’s everyday bed. Buy the top-bunk mattress against the bed’s published ceiling, the bottom-bunk mattress for comfort within its own ceiling, and the trundle mattress against the trundle’s clearance.
The arithmetic that catches people out
A mattress topper counts toward the total exactly the way mattress does. On the budget metal frame here, the manufacturer publishes a 12.8 in rail and recommends a 6 in mattress on the top deck: that leaves 6.8 in of clearance, comfortably over the federal 5 in minimum. Put the 8 in mattress the same brand recommends for the bottom bunk up top instead and you are at 4.8 in — under the minimum, with nothing visibly wrong from the doorway. Our guide to mattress thickness and guardrails works the sum through for every combination.
Living with a trundle, after the assembly day
Two practical things decide whether the third bed gets used or becomes a drawer. The first is where the bedding lives. A trundle that has to be made up from a linen cupboard two rooms away gets made up once. The workable arrangement is to leave the trundle made, with a fitted sheet and a thin quilt that clears the frame, so opening it is a ten-second job rather than a twenty-minute one. Bedding that stays put is the same problem you get on an upper bunk, and the solutions are the same — see bedding for a top bunk for what works when tucking in is awkward.
The second is the floor under the bed. A trundle rolls on the same floor the dust lives on, and a castored unit that jams on a rug or a transition strip stops being a bed a child can open unaided. Check the run before you commit to which side the trundle pulls out from — several frames here let you choose at assembly, and it is much harder to change your mind afterwards.
When a trundle is the wrong answer
When the third bed is permanent. A trundle mattress is thin because it has to be. For a child sleeping there every night, a bunk built for a small room plus a separate bed is the better outcome, even where it costs more floor.
When the room is genuinely tight. The trundle is free when closed and expensive when open. If there is no clear floor along one long side of the bed, it will live closed and you will have paid for a drawer.
When storage is the actual problem. Under-bed drawers in the same slot hold a great deal more than a guest sleeps in. Several frames here offer either configuration, and what children actually put away is a better guide to that choice than the product photography is.
Why one brand takes four of the seven places
Because it publishes the numbers. We did not set out to fill more than half a roundup with one manufacturer, and the ranking criterion put it there: Max & Lily state a rail height, a per-surface weight limit and a separate trundle ceiling on every configuration they sell, and most of the category states one of the three at best. That is a finding about how thinly this category documents itself, not a preference for a brand.
It is also why the cheapest bed on the page scores as well as it does on transparency while scoring poorly on rail margin. A manufacturer that tells you the rail is 12.8 inches and the mattress should be six has handed you everything you need to make the bed safe. A manufacturer that publishes nothing has handed you a box, whatever it charged for it.
The picks, in full
Every pick below carries the same spec block, so you can compare the numbers across this page and every other page on the site.
#1 · A shared room that hosts a third child most weekends
Max & Lily Twin Over Twin Bunk Bed With Trundle
Max & Lily
The only trundle bunk we found that publishes a rail height, a per-surface weight limit and a separate mattress ceiling for the trundle itself.
| Guardrail height above mattress | 14 in above the slats |
|---|---|
| Stated weight limit (per bunk) | 400 lb per sleeping surface |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | 8 in on both bunks (5 in recommended on top); 5 in on the trundle |
| Materials / construction | Solid knot-free pine, GREENGUARD Gold certified finish |
What works
- Publishes all three numbers that matter on a trundle bunk, including the trundle's own mattress limit
- 400 lb per sleeping surface is the highest stated capacity in this roundup
- Trundle can be assembled to pull out from either side of the bed
- Separates into two standalone twin beds, so the frame outlasts the sharing arrangement
What doesn’t
- The trundle takes a 5 in mattress, which is thinner than most people expect and narrows your options
- No minimum age published, so the AAP's under-6 top-bunk guidance is the only age rule you get
- The trundle on this model has no wheels, so it wants a hard floor or a low-pile rug
- Sits at the top of the price range for the category
The catch: That 8 in bunk ceiling and 5 in trundle ceiling are two different numbers, and buying one mattress for all three surfaces is the obvious mistake. A 5 in trundle mattress on the top bunk wastes rail margin you paid for; an 8 in mattress on the trundle stops it sliding under the bottom bunk at all.
#2 · Rooms with a low ceiling or a tight wall run
Max & Lily Modern Farmhouse Twin Over Twin Bunk Bed With Trundle
Max & Lily
The shortest and shallowest trundle bunk here, and the only one that tells you the top bunk caps out at seven inches of mattress.
| Guardrail height above mattress | 13.5 in |
|---|---|
| Stated weight limit (per bunk) | 400 lb per sleeping surface |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | 7 in top bunk, 8 in bottom bunk, 5 in trundle |
| Materials / construction | Solid New Zealand pine with a low-VOC finish |
What works
- 78.5 in long and 63.25 in tall, the smallest footprint and the lowest top deck of any pick here
- Publishes a different ceiling for each of the three surfaces rather than one number for the whole bed
- Built-in ladder can be installed on the left or the right, so the bed does not decide your layout
- 400 lb per surface on a frame this compact is unusual
What doesn’t
- 13.5 in of rail is half an inch shorter than the rest of the Max & Lily range, which matters when the mattress is thick
- A built-in ladder cannot be removed later the way a hook-on ladder can
- No minimum age published
- Three inches shorter overall means a tall teenager will outgrow it before the weight limit does
The catch: The published stack is tight by design. A 7 in mattress under a 13.5 in rail leaves 6.5 in of clearance, which clears the federal 5 in minimum with room to spare — but add a 2 in topper and you are at 4.5 in, which does not. On this bed more than any other here, the topper is the thing that quietly breaks compliance.
#3 · A younger child who should not be on a ladder at night
Max & Lily Twin Over Twin Bunk Bed With Stairs & Trundle
Max & Lily
Stairs with storage built into them, plus a third bed underneath — and a footprint that will not fit the small room this is usually bought for.
| Guardrail height above mattress | 14 in from the top of the slats |
|---|---|
| Stated weight limit (per bunk) | 400 lb per sleeping surface |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | Trundle 5 in (6 in maximum); bunk ceiling not published for this model |
| Materials / construction | Solid knot-free pine, GREENGUARD Gold certified finish |
What works
- Grooved anti-slip stairs with a bannister, positionable on either side
- Storage built into the staircase, which is the only storage here you do not pay for separately
- Same 14 in rail and 400 lb per surface as the ladder version
- The trundle still rolls away underneath, so the bed sleeps three in a two-child footprint
What doesn’t
- 99.5 in long — nearly a foot and a half longer than the ladder version, all of it staircase
- Max & Lily publish the trundle's mattress limit but not the bunks' on this configuration
- The heaviest and slowest assembly here at around 360 lb of furniture
- The most expensive pick on this page by a wide margin
The catch: The stairs and the trundle fight each other for floor. The staircase eats about nineteen inches at one end and the trundle needs clear floor along one side when it is open, so this bed wants a room with space on two of its four sides. In a genuinely small room, the ladder version plus a night light is the better buy.
#4 · A room that has to hold a guest, not just a friend
Max & Lily Twin Over Full Bunk Bed With Trundle
Max & Lily
Three beds, one of them full size, which makes this the only pick here an adult can sleep in without checking a sticker first.
| Guardrail height above mattress | Approximately 14 in, per the manufacturer |
|---|---|
| Stated weight limit (per bunk) | 400 lb per sleeping surface |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | 8 in top and bottom, 5 in trundle (6 in maximum) |
| Materials / construction | Solid pine with plywood slats and a metal support bar, GREENGUARD Gold certified |
What works
- A full-size bottom bunk plus a twin trundle sleeps three without a sofa bed anywhere in the house
- 400 lb per surface means the full bunk is genuinely adult-rated
- The trundle on this model has wheels, which makes it far easier to pull out on carpet
- Separates into a twin and a full when the sharing ends
What doesn’t
- 57.75 in wide — about a foot wider than a twin-over-twin, and that foot is usually the walkway
- The guardrail figure is given as approximate rather than as a measured spec
- A full mattress, a twin mattress and a thin trundle mattress is three separate purchases
- Heavy enough that repositioning the assembled bed is a two-person job
The catch: The width is the real cost, not the price. A twin-over-full with the trundle open occupies roughly the floor area of two separate beds, which undoes the space argument that made you consider a bunk bed in the first place. Buy this one for sleeping capacity, not for floor space.
#5 · A small room that needs storage and a spare bed
Harper & Bright Designs Twin Over Twin Bunk Bed With Trundle and 3 Drawers
Harper & Bright Designs
A trundle and three drawers under one frame at well under the price of the solid-pine specialists, with a published weight limit and nothing else.
| Guardrail height above mattress | Not published by the manufacturer |
|---|---|
| Stated weight limit (per bunk) | 400 lb top bunk and 400 lb bottom bunk on this listing |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | Not published by the manufacturer |
| Materials / construction | Pinewood and MDF with iron alloy bolt connections |
What works
- A trundle and three storage drawers on a single frame, which is two furniture purchases avoided
- Wheels on the trundle unit, so it pulls out on carpet without lifting
- Publishes a per-bunk weight limit, which the cheapest wood bunks often do not
- Separates into two individual beds
What doesn’t
- No guardrail height and no mattress ceiling published, so the 5 in clearance check is entirely yours to run
- MDF in the mix means the frame tolerates being taken apart and rebuilt less well than solid pine
- Harper & Bright publish very different weight limits across near-identical trundle models
- Long assembly — a bunk, a trundle and three drawers share one manual
The catch: This brand's trundle bunks are not one product. We found listings from the same range rated 150 lb on the top bunk and listings rated 400 lb, in frames that look nearly identical in the photographs. Read the weight limit on the exact variant and color you are ordering, because it does not carry over.
#6 · A guest room or a tight budget
Harper & Bright Designs Twin Over Twin Metal Bunk Bed With Trundle
Harper & Bright Designs
The cheapest way into three beds, and the only budget pick here that publishes its rail height and its mattress ceiling together.
| Guardrail height above mattress | 12.8 in |
|---|---|
| Stated weight limit (per bunk) | 220 lb top bunk, 220 lb bottom bunk, 200 lb trundle |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | 6 in top bunk, 8 in bottom bunk (manufacturer recommendation) |
| Materials / construction | Powder-coated steel tube frame |
What works
- Publishes a rail height, three separate weight limits and a mattress recommendation for each deck
- Steel frame arrives in fewer pieces and assembles faster than any wood bunk here
- Removable ladder, and the trundle is rated for 200 lb
- By far the lowest price in this roundup
What doesn’t
- 12.8 in is the shortest rail here, and the 6 in top-bunk recommendation exists because of it
- 220 lb per bunk rules out most adults on the top deck and some on the bottom
- Steel tube frames develop movement as fasteners settle and need re-tightening every few months
- Metal slat decks transmit noise between bunks more than a wood frame does
The catch: Do the arithmetic before you buy a mattress. A 6 in mattress under a 12.8 in rail leaves 6.8 in of clearance, which is compliant. The 8 in mattress the same brand recommends for the bottom bunk leaves 4.8 in if you put it on top — below the federal 5 in minimum. The recommendation is deck-specific, and swapping the two mattresses around is enough to break it.
#7 · A room the child will not outgrow the look of
Donco Kids Austin Mission Twin Over Twin Bunk Bed With Twin Trundle
Donco Kids
Solid pine in a mission style that does not look like children's furniture, with a weight limit published and nothing else.
| Guardrail height above mattress | Not published by the manufacturer |
|---|---|
| Stated weight limit (per bunk) | 220 lb per bunk |
| Manufacturer minimum age | Not published by the manufacturer |
| Mattress thickness ceiling | Not published by the manufacturer |
| Materials / construction | Solid pine with a non-toxic finish; listed as meeting or exceeding ASTM and CPSC standards |
What works
- Solid pine throughout rather than pine and MDF
- Mission styling reads as furniture rather than as a kids' bed, which extends its useful life
- The trundle is a separate unit, so it can be added or skipped depending on the configuration
- Explicitly listed as meeting or exceeding ASTM and CPSC standards
What doesn’t
- 220 lb per bunk is little more than half the capacity of the pine specialists here
- No guardrail height and no mattress ceiling published
- No published weight limit for the trundle itself
- Configurations and trundle availability vary between retailers, so the listing you buy from decides what arrives
The catch: The compliance claim on the listing covers the bed as designed, not the bed as you will assemble it. Without a published rail height or mattress ceiling, the only way to know the finished bunk still clears the federal 5 in rule is to measure it yourself once the mattress is in. Budget for the tape measure, not just the bed.
Questions parents actually ask
Are bunk beds with trundles safe?
The bunk above is governed by the same federal standard as any children’s bunk bed, so a trundle does not make the bed less safe. What it adds is a third mattress to choose correctly and a second thing to trip over at night if it is left open — keep the trundle closed when nobody is sleeping in it.
How thick can a trundle mattress be?
Thinner than you would expect. Among the picks here that publish a figure, the limit is 5 inches, with one range allowing up to 6. The constraint is the clearance under the bottom bunk, so exceeding it means the trundle will not close.
How much floor space does a trundle need?
Roughly a full mattress width along one side of the bed while it is open — about 40 inches for a twin trundle, plus room to walk. Closed, it adds nothing to the footprint.
Can an adult sleep on a trundle bed?
Only if the trundle carries its own stated weight limit and that limit allows it. One pick here publishes 200 lb for the trundle; several publish nothing at all for it, and a bunk’s per-bunk rating does not transfer to the unit underneath.
Do trundle beds come with a mattress?
Almost never, and the trundle mattress is the one most often forgotten at checkout. Budget for three mattresses on a twin-over-twin with a trundle, each chosen against its own thickness ceiling.
Can I add a trundle to a bunk bed I already own?
Sometimes — several brands sell the trundle as a separate unit that slides under a compatible frame. Measure the clearance under your bottom bunk first, because that gap, not the bed’s brand, is what decides whether a trundle fits.
Is a trundle better than a twin over full bunk bed?
For occasional guests, yes: the trundle is free floor space when closed. For a third child sleeping there nightly, a full-size bottom bunk is the more comfortable bed, and it is about a foot wider. See bunk bed sizes and dimensions.
Sources
Read next
- The best bunk beds for kids
The full ranking, on the same four published numbers.
- Best bunk beds for small rooms
Footprints measured, including what a trundle costs when it is open.
- Mattress thickness and guardrails
The five-inch rule, and the topper that quietly breaks it.
- Bunk bed sizes and dimensions
Every configuration's footprint and clearance in one table.
Back to Bunk Beds.