How to Measure Up for High Sleeper Beds: A Simple Sizing Guide

To measure up for a high sleeper bed, start with the ceiling height, then measure the floor area, the space for the ladder or steps, and the depth of the mattress you intend to use. The key figure is the gap between the top of the mattress and the ceiling: aim for enough room for the sleeper to sit up comfortably, which in practice means leaving roughly 75 to 90 cm of clear headroom. If your room cannot give you that, a mid sleeper is usually the better choice.

That is the short answer. The longer one involves windows, radiators, light fittings and the shape of the person who will sleep up there. Below we take each measurement in turn, so you can browse our modern bunk beds and high sleepers UK sale range knowing exactly which frame dimensions will work in your room.

What You Will Need Before You Start

A metal tape measure is more reliable than a fabric one for ceiling heights, because it stays rigid as you extend it upwards. A pencil, a notepad or phone, and a second person to hold the far end will make the job quicker. Low painter’s tape is useful too: once you have your figures, you can mark the footprint of the frame on the floor and live with it for a day or two.

Write every measurement in centimetres, since that is how most UK frame specifications are listed.

Step One: Measure the Ceiling Height Properly

Measure from the floor to the ceiling in at least three places: near the wall where the bed will sit, in the middle of the intended footprint and at the opposite corner. Older UK homes in particular can have ceilings that dip or rise by a few centimetres across a single room, and the lowest reading is the one that counts.

Next, look up. A ceiling light, a smoke alarm or a beam directly above the sleeping area all reduce usable headroom. Pendant lights should be moved or swapped for a flush fitting if the bed will sit beneath them. Note the height of anything that hangs down and subtract it from your ceiling figure for that part of the room.

If the room is in a loft conversion or has a sloping ceiling, measure the height at the point where the slope begins and at the deepest part of the eaves. A high sleeper generally needs to sit where the ceiling is at full height, with the slope only above the foot or the side away from the sleeper’s head.

Step Two: Work Out the Headroom You Need

Headroom is the measurement people most often get wrong. It is the distance between the top surface of the mattress and the ceiling, not between the frame and the ceiling. To find it, take the height of the sleeping platform from the frame specification, add the depth of your mattress, then subtract that total from the lowest ceiling reading.

Ask the person who will use the bed to sit on the floor with their back against a wall, then measure from the floor to the top of their head and add a comfortable margin. That number is a better guide than any general rule, because a seven year old and a tall teenager need very different amounts of space. For a child who will grow into the bed, plan for the height they are likely to be in a few years rather than today.

As a broad guide, high sleepers with a platform height of around 160 to 180 cm usually suit rooms with a standard UK ceiling of about 240 cm. In rooms with lower ceilings, a mid sleeper with a platform closer to 110 to 130 cm keeps the arrangement comfortable without losing the space underneath entirely.

Step Three: Measure the Floor Footprint

A single high sleeper usually takes a standard UK single mattress, which measures 90 by 190 cm. The frame itself will be larger, typically adding several centimetres on each side for the rails and posts. Check the overall external dimensions in the specification rather than assuming the frame matches the mattress size.

Measure the wall you plan to place the bed against, then measure out from that wall into the room. Mark the full footprint with tape, including any steps or ladder that extend beyond the frame. Then stand in the room and check that doors open fully, wardrobe doors and drawers have space to swing out, and there is a clear walkway of at least 60 cm alongside the bed.

Placing the frame in a corner gives it two walls of support and tends to feel more settled in a small room. It also keeps the open side of the bed facing into the room, which helps when changing the bedding.

Step Four: Plan for the Ladder or Steps

Ladders come in two main forms: vertical or slightly angled ladders fixed to the end or side of the frame, and staircase steps, often with built in storage. A straight ladder takes up almost no floor area beyond the frame, but it can be harder for younger children to climb safely. Staircase steps are easier to use and add storage, but they can project 50 cm or more from the frame.

Measure the space you have at the end and along the side of the bed. Then decide which side the ladder needs to sit on. Some frames allow the ladder to be fitted on either end, which can solve an awkward layout. Whichever you choose, leave a clear landing area at the foot of the ladder that is not blocked by a door swing or a piece of furniture.

Step Five: Check the Height Under the Platform

The appeal of a high sleeper is the space underneath. If you intend to fit a desk, a small sofa or a run of storage below, measure what you would like to place there and compare it with the clear height under the platform in the specification.

For a desk, the sitting user should have room to sit and stand without stooping, so the underside of the platform needs to sit well above head height when seated. For storage, measure the height of any chest or shelving you already own, and remember to allow a little space above it so the bed frame is not resting on it. Our modern bedroom furniture UK collections include low chests and slim storage that can work well tucked underneath.

Step Six: Measure the Mattress Depth You Can Use

Every high sleeper comes with a maximum recommended mattress depth. This is not a suggestion: the guard rail around the top bunk only does its job if enough of it sits above the mattress surface. The British and European standard for bunk and high beds, BS EN 747, sets out minimum guard rail heights above the mattress, and manufacturers state the maximum mattress depth so that the bed stays within that requirement.

In practice, this usually means a mattress in the region of 15 to 20 cm deep. A thick hybrid or pillow top mattress can raise the sleeper too high and reduce the protection the rail provides. When you choose from modern mattresses UK sale, check the depth against the frame specification before you order.

Windows, Radiators and Sockets

Once your footprint is marked, look at the wall the bed will sit against. A window behind the top bunk can make the bed feel bright and airy, but it also raises safety questions. Ideally, the window sill should sit above the height of the guard rail, and window restrictors are a sensible addition in any child’s room with a raised bed.

Radiators need breathing space. Avoid placing the sleeping platform directly above a radiator, as warm air rising into the bunk can make it uncomfortably hot and can dry out the mattress. If the radiator sits under the platform, leave a clear gap between it and anything stored below.

Plug sockets and light switches are often overlooked. Check that you will still be able to reach the main light switch from the doorway and that there is a socket near the space under the bed if you plan to use a desk lamp or charge a laptop there.

Getting the Frame Into the Room

Most high sleepers arrive flat packed, so the boxes are usually manageable. Even so, it is worth measuring the narrowest point on the route into the room: the front door, the turn at the top of the stairs and the bedroom doorway. Long boxes can be awkward on the tight staircases common in terraced houses, and you will need clear floor space in the bedroom to lay out the panels during assembly.

Thinking Ahead About Storage

High sleepers are often bought to free up floor space, so it helps to plan the storage at the same time. Open shelving underneath keeps books and toys within easy reach, while drawers and baskets help hide clutter. Our range of children's storage furniture UK includes pieces sized to sit comfortably in the space below a raised bed.

If two children share the room, a high sleeper on one side and a standard bed on the other can make good use of the space. We look at that kind of arrangement in our guide to storage furniture for UK homes where children share rooms. For older children who might prefer a standard single later on, our piece on upholstered single beds for UK children and teenagers is a useful next read.

A Quick Checklist Before You Choose

Before you settle on a frame, run through your figures one last time. Confirm the lowest ceiling height across the footprint, subtract the platform height and mattress depth, and check that the remaining headroom suits the sleeper. Confirm the external footprint fits with a clear walkway, that the ladder or steps have a safe landing, and that doors and drawers can open. Check the clear height underneath against anything you plan to place there, and make sure the route into the room is wide enough for the boxes.

When those numbers line up, you can choose with confidence. Browse the full range at Furniture in Fashion, where we offer free delivery to most UK mainland postcodes.

Frequently Asked Questions

What ceiling height do I need for a high sleeper bed?

Most high sleepers suit rooms with a standard UK ceiling of around 240 cm. The important figure is the headroom above the mattress, which should allow the sleeper to sit up comfortably. If your ceiling is noticeably lower, a mid sleeper is likely to be more comfortable.

How much space do I need around a high sleeper?

Allow a clear walkway of around 60 cm along the open side of the bed, plus enough room at the foot of the ladder or steps for a safe landing. Make sure doors, drawers and wardrobe doors can open fully without hitting the frame.

Can I use any mattress on a high sleeper?

No. Each frame has a maximum recommended mattress depth so that the guard rail sits high enough above the sleeping surface. Always check the frame specification and choose a mattress within that limit.

What age is a high sleeper suitable for?

General safety guidance in the UK is that children under six should not sleep on a raised top bunk or high sleeper. For younger children, a mid sleeper or a standard single bed is a safer option.

Should a high sleeper go against a wall?

Yes, where possible. Placing the frame against one or two walls gives it extra stability and reduces the number of open sides. Many manufacturers also recommend fixing the frame to the wall, so check the assembly instructions.