A trundle bed is a low bed on castors or a sliding mechanism that stores beneath a main bed and pulls out when a second sleeping space is needed. The whole arrangement takes the floor area of one bed most of the time and provides two beds when required, which is why it appears so often in children’s rooms and small guest rooms.
Most trundles hold a single mattress, typically 90cm by 190cm, and slide out from beneath a single or small double bed above. Some designs simply roll out at floor level. Others lift on a scissor or pop up mechanism so the second mattress rises to sit level with the main bed, creating one large sleeping surface.
The roll out trundle is the most basic and the most common. It is a shallow frame on castors with a slatted or solid base, and it slides out to sit low on the floor. The mattress it takes is usually thinner than a standard mattress, often 15cm to 18cm deep, because depth is limited by the clearance under the bed above.
The pop up trundle adds a lifting mechanism. Once pulled out, the frame raises to match the height of the main bed. Push the two together and you have something close to a king size sleeping surface, which is genuinely useful in a guest room that occasionally sleeps a couple. The mechanism adds cost and weight, and it needs more clearance to operate.
Drawer style trundles sit somewhere between a bed and storage. The pull out section can hold a mattress for occasional use or be used as a deep drawer for bedding and clothes the rest of the time. In a child’s room, that flexibility often matters more than the second sleeping space.
Guest beds and stacking beds are close relatives. They are separate frames rather than housed under another bed, but they solve the same problem. If you are comparing options, it is worth looking at the wider modern beds UK sale range to see how each format uses floor space differently.
Children’s rooms are the obvious case. Sleepovers are frequent, the second bed is used irregularly, and a permanent second bed would take floor that children need for playing. A trundle handles this well, and it avoids the height and safety considerations that come with bunk beds for younger children.
Small guest rooms are the second case. Many British homes have a second bedroom doing duty as a study, a home office or a spare room. A single bed with a trundle underneath keeps the room usable during the week and lets it sleep two when family visit.
Studio flats and annexes benefit too, particularly where a sofa bed is already doing daytime work and a second option is needed. And in a shared child’s room where bunk beds feel too tall, a trundle gives two beds at low level.
Where a trundle makes less sense is as a permanent bed for a second person. The lower mattress is usually thinner, the frame sits closer to the floor, and pulling it in and out every day becomes tiresome. For everyday use by two children, two singles or a bunk bed will serve better, and our modern childrens beds UK sale range covers both.
Three measurements decide whether a trundle will work in your room. First, the under bed clearance of the main bed, which must exceed the height of the trundle frame plus its mattress. Second, the pull out depth, since a trundle needs roughly the full length or width of a mattress in clear floor to extend into, depending on which way it pulls. Third, the door swing, because a pulled out trundle across a doorway blocks the exit.
Plan the pull out space honestly. A trundle sliding out sideways from a bed against a wall needs around 90cm of clear floor beside it, and that floor cannot be occupied by a wardrobe, a radiator or a chest of drawers with the trundle in use. It is fine for that space to be used during the day, as long as the items are easy to move.
Floor surface matters more than people expect. Castors run easily on hard floors and struggle on thick carpet, particularly with a mattress and bedding loaded on the frame. On deep pile carpet, look for larger wheels or a design that glides on runners rather than small castors.
Trundle mattresses are usually thinner by necessity, and thin does not have to mean uncomfortable. A good quality foam or pocket sprung mattress at 15cm to 18cm can be perfectly comfortable for guest use and for children. What matters is that the base beneath it is properly supportive, with either closely spaced slats or a solid ventilated platform.
Check the maximum mattress depth stated for the trundle before buying. Exceeding it means the trundle will not slide back under the main bed, which is the single most common problem people run into. Also confirm the mattress size, since some trundles take a slightly shorter mattress than a standard single.
Ventilation is worth a thought. A mattress stored under a bed for weeks between uses can pick up damp in a cold room, so airing it occasionally and choosing a slatted base rather than a solid one both help.
Bedding storage is the practical detail that decides whether a trundle gets used. If the sheets and duvet for the lower bed live in a cupboard on another floor, the bed will feel like an effort. Keep them in an ottoman box, a blanket box at the foot of the bed, or inside the trundle itself where the design allows. There are useful options across our modern blanket box UK sale range for exactly this.
Height difference is the other thing guests notice. A roll out trundle sits low, which younger children rarely mind and adults sometimes do. If the trundle will regularly host adults, a pop up mechanism is worth the extra outlay.
Check the mechanism periodically. Castors collect hair and carpet fibres, and a stiff trundle usually just needs the wheels cleared. Tighten frame fixings once or twice a year, since repeated pulling loosens joints over time.
Ottoman beds give storage rather than a second bed, and in a room where guests are rare, storage may be the better use of the space. Sofa beds work in living rooms and studies where a bed cannot be permanent. Bunk beds give two full beds in one footprint but need ceiling height and suit older children.
Day beds with trundles combine a seating profile with two sleeping spaces, which suits a study or a snug that has to double as a guest room. Whichever route you take, browsing the full bedroom furniture UK sale selection at Furniture in Fashion UK makes it easier to see how the pieces work together in one room.
Because a trundle involves a moving part at floor level, a few checks are worth making before it goes into a child’s room. The lower bed should lock or sit firmly in place when extended, so it does not slide when someone gets in or out. Castors should roll smoothly without needing force, since a stiff mechanism is what leads to trapped fingers.
Make sure the gap between the two mattresses is small enough that a younger child cannot roll into it, and keep the pull out bed closed when it is not in use so nobody catches a foot on it in the dark. These are small habits rather than major concerns, but they are the difference between a trundle that works well for years and one that becomes an irritation.
The practical challenge with a trundle is where the second set of bedding lives. Some designs allow you to leave the lower bed made up, which is by far the easiest arrangement, provided the mattress depth still lets the unit close. Others are too shallow for that, so the bedding needs a home elsewhere in the room.
A blanket box at the end of the bed or a deep drawer under a wardrobe solves this neatly. Storing the bedding in the same room as the bed means the trundle can be made up in a couple of minutes rather than becoming a small project every time someone stays.
Trundles tend to suit a particular stage. They are ideal while children are young enough to have frequent sleepovers and small enough not to mind a lower mattress. As children reach their teens, the lower bed is often used less, and the appeal of a full sized guest arrangement grows. If you want a bed that will still be earning its place in ten years, consider whether a standard frame with a separate folding option might serve the room better over that longer span.
Most take a standard single at 90cm by 190cm, but the depth is limited, usually to around 15cm to 18cm, so the mattress fits back under the main bed.
Yes, for occasional use. A pop up trundle that rises to the height of the main bed is more comfortable for adults than a low roll out design.
It is better suited to occasional use. Pulling the bed out and making it daily becomes tedious, and two separate beds are a better answer for permanent sharing.
Allow roughly a full mattress width of clear floor, around 90cm, on the side the trundle pulls out from, and check it does not block the bedroom door.
They can, though small castors struggle on deep pile. Look for larger wheels or a runner based design if the room has thick carpet.
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