How to Measure Up for Chair Beds: A Simple Sizing Guide

To measure up for a chair bed, you need three sets of figures: the closed footprint of the chair, the full open length once the bed is extended, and the clear width of every doorway and turn on the route into the room. Measure the floor in both positions, leave enough space to walk around the open bed, and check the delivery path before you choose a design. If all three fit with a little room to spare, the chair bed will work in your home.

A chair bed spends most of its life as an armchair and only occasionally becomes a bed, so it has to suit two quite different layouts in the same room. Our collection of modern sofa beds UK includes compact single seat designs alongside larger models, and it sits within our wider range of modern sofas UK sale pieces. The guide below takes you through each measurement in the order that makes the job straightforward.

Start with the Closed Footprint

Measure the width of the chair from the outer edge of one arm to the outer edge of the other, then the depth from the front of the seat to the back of the frame. Chair beds are often a little deeper than an ordinary armchair because the folded mattress or cushions sit within the base. Record both figures in centimetres, since that is how product dimensions are usually listed.

Mark the footprint on the floor with masking tape. It can feel like a fussy step, but an outline on the carpet tells you far more than a tape measure held in the air. Walk around it, open nearby doors and drawers, and sit where you would normally sit. If the outline already feels tight as a chair, it will feel tighter once the bed is out.

Height matters too. A chair bed placed under a window needs to clear the sill, and one beside a radiator should leave a small gap so warm air can circulate and the upholstery is not baked through the colder months. If you find a single seat is all you really need and overnight guests are rare, it can help to compare the footprint against single seater fabric sofas UK to see how much extra depth the bed mechanism adds.

Measure the Open Length and Add Clearance

The open length is the figure most people overlook. A chair bed that sits around 90 cm deep as a chair can extend to roughly twice that once unfolded, depending on the mechanism. Find the open dimensions in the product details, then measure from the wall behind the chair to where the foot of the bed will land.

Next, add clearance. Aim for enough space beside the open bed for a guest to get in and out comfortably, and enough at the foot to pass by without climbing over it. In a narrow room, the bed may only need to be reachable from one side, but that side should not be blocked by a door swing or a wardrobe that cannot be opened.

Think about what else lives in that floor space. A coffee table or footstool in front of the chair will need to move each time the bed is opened. Choosing lighter pieces makes this easier, and modern footstools UK are simple to lift aside or tuck into a corner while the bed is in use. Our guide to sofa bed open dimensions for UK rooms explains how open sizes are typically quoted and how to read them against your floor plan.

Check the Route Into the Room

A chair bed that fits the room but cannot reach it is a common frustration. Measure the width and height of every doorway on the route, including the front door, internal doors and any door frames on landings. Note the narrowest point, because that is the one that decides what will pass.

Stairs need extra attention in older UK homes. Measure the width of the staircase, the headroom where the ceiling drops above the stairs, and any tight turns or half landings. Banisters and radiators on the stair wall can reduce the usable width more than you might expect.

Compare these figures with the packaged or diagonal depth of the chair if it is listed. A chair bed can sometimes be tilted through a doorway that is narrower than its width, as long as the diagonal measurement fits. If legs are removable, the height of the chair through the frame becomes smaller, which can make a real difference.

Consider Who Will Sleep On It

Sleeping length is worth checking against the height of your likely guests. Most chair beds give a sleeping area close to a standard single bed, but some compact designs are a little shorter. Taller adults will be more comfortable with a model whose mattress length is listed clearly and gives a few centimetres beyond their height.

Width is fixed by the chair itself, so a chair bed is a one person sleeper. If you regularly host couples, a larger sofa bed will be more practical. For children, teenagers or a single adult staying for a night or two, a chair bed is usually a sensible fit.

Look at the mattress or cushion depth as well. Deeper foam generally feels more supportive, but it also adds to the closed depth of the chair. Balancing comfort against footprint is part of measuring up properly, rather than something to leave until after delivery.

Sizing Notes for Different Rooms

Box rooms and small spare rooms

In a box room, the open bed often fills most of the floor. Place the chair against the shortest wall so the bed extends along the length of the room, and keep the door side clear. A chair bed works well here because, when closed, the room can still be used as a study or dressing space.

Living rooms

In a living room, a chair bed usually sits alongside a main sofa. Measure the gap between the chair and the sofa, the coffee table and the television unit, as the open bed will need to slot into one of these zones. Corners near a window are often the easiest spot to open out.

Home offices

Where the chair bed shares a room with a desk, check that the desk chair can be pushed fully under the desk so the bed can extend. A wall mounted shelf above the chair keeps the floor clear and gives guests somewhere to put a phone and glass of water.

Landings and nooks

Wide landings and alcoves can hold a chair bed as a reading seat. Here, measure fire escape routes carefully. A bed opened across a landing must never block the only way down the stairs.

A Simple Measuring Checklist

• Closed width, depth and height of the chair
• Open length from the back of the chair to the foot of the bed
• Clearance beside and at the foot of the open bed
• Distance to windowsills, radiators and sockets
• Width and height of every doorway on the delivery route
• Staircase width, headroom and any tight turns
• Sleeping length compared with your tallest likely guest
• Where you will move coffee tables or footstools when the bed is open

Keep these figures together on your phone or a sheet of paper. When you compare chair beds, you can check each product against the list in a few seconds instead of measuring again.

Common Measuring Mistakes

The most frequent mistake is measuring the room but not the open bed. The second is ignoring skirting boards, which can add a couple of centimetres to the distance between the chair and the wall. A third is forgetting that carpets with deep pile can make mechanisms catch slightly, so allow a little extra space for the bed to roll or unfold smoothly.

It is also easy to assume that a chair bed will sit flush against the wall when open. Many designs need a small gap behind the back cushions to allow the mechanism to move. Check the product details for any recommended clearance at the back.

Bringing It Together

Measuring for a chair bed is mostly about patience: two footprints, one route and a realistic look at who will be sleeping on it. Once those numbers are in hand, choosing a design becomes much simpler, because you can focus on fabric, comfort and style knowing the size already works. You can browse our full range at Furniture in Fashion, with free delivery to most UK mainland postcodes.

Frequently Asked Questions

How much space do I need for a chair bed when it is open?

You need the full open length listed by the manufacturer, plus enough space beside the bed for someone to get in and out. Measure from the wall behind the chair to the foot of the bed and add clearance for walking past.

Can a chair bed fit through a narrow doorway?

Often it can, if the diagonal depth of the chair is smaller than the door opening and the legs can be removed. Measure the narrowest doorway on the route and compare it with the packaged dimensions.

Is a chair bed long enough for an adult?

Many chair beds offer a sleeping length close to a single bed, which suits most adults. Check the listed mattress length against the height of your tallest guest before choosing.

Should a chair bed sit against a wall?

Usually yes, but some mechanisms need a small gap behind the back cushions to open smoothly. Look for any recommended rear clearance in the product details.