To measure up for an iron bed, start with the mattress size you want, then add the frame. Iron beds are usually a few centimetres wider and longer than the mattress they hold, and the headboard, footboard and any posts can add more again. Measure the floor space, the walls the bed will sit against, the route into the room and the clearance you need around it. With those four sets of numbers, choosing the right size becomes straightforward.
Our range of modern metal beds UK sale lists both mattress size and overall frame dimensions on each product page, which is the figure that matters most when you are planning a room. Below, we walk through the process step by step, using standard UK sizes and the kind of rooms most of us actually live in.
Iron beds are built around standard UK mattress sizes, so this is the natural starting point. These are the dimensions most British retailers and manufacturers work to:
European sizes differ, so if you are keeping an existing mattress, measure it rather than relying on the label. A mattress that is a few centimetres out can sit loosely in a frame or refuse to fit between the side rails altogether.
An iron bed frame wraps around the mattress, so the side rails, the end rails and the posts all take up space beyond it. On a simple design the difference may be only five to eight centimetres in width. On a traditional bed with chunky corner posts, scrolled ironwork or a footboard that curves outward, the overall footprint can grow noticeably.
Length is where people are most often caught out. A double mattress is 190cm long, but once you add a headboard with posts and a footboard, the bed can easily measure well over two metres from end to end. In a narrow room where the bed faces a wardrobe or a door, those extra centimetres decide whether the space feels comfortable or cramped.
Always look for the external dimensions of the frame, not just the mattress size. If a listing shows both, plan around the larger figure.
Use a metal tape measure and note everything down as you go. A quick sketch of the room on paper, with the door, window and radiator marked, makes the numbers much easier to work with.
Measure the full width and length of the room at floor level. Then measure the wall you plan to put the bed against, from corner to corner, and note anything that interrupts it: skirting, sockets, a radiator or a window that starts low on the wall.
A bed needs space around it to be usable. As a general guide, aim for around 60cm to 70cm of clear floor on each side you will get out of, and similar space at the foot if you need to walk past. You can manage with a little less in a small room, but below roughly 50cm the space starts to feel tight, particularly when making the bed or opening drawers.
Open every door in the room, including wardrobe doors, and check where they swing. Pull out chest of drawers runners fully. The bed should not block any of these, and you should still be able to stand comfortably in front of a wardrobe once its doors are open.
Iron beds often have taller headboards than upholstered designs. Measure from the floor to the bottom of the window sill, and to any shelves, wall lights or sloping ceiling above the bed. A tall decorative headboard placed under a low window can partly cover the glass and look awkward from outside as well as in.
Most iron beds arrive flat packed in sections: headboard, footboard, side rails and slats. The largest single piece is usually the headboard, so its width and height are what need to pass through your hallway and stairs.
Measure the narrowest point of the journey from the front door to the bedroom. In many terraced houses this is the turn at the top of the stairs, where a low ceiling or a handrail can limit what you can manoeuvre. In flats, check the lift interior and any fire doors on the corridor. If the headboard is wider than a turn allows, it may need to be carried up on its side, which requires extra height.
Bed height affects comfort as much as appearance. The figure you want is the height of the sleeping surface: the frame height to the top of the slats, plus the depth of your mattress.
Iron beds vary quite a bit here. Some sit low with a modern feel, while traditional designs often place the slats higher to show off the ironwork beneath. A comfortable sitting height for most adults is one where your feet rest flat on the floor with your knees roughly level with your hips. If you have a deep pocket sprung mattress, a lower frame can balance it out. A thinner mattress on a low frame can feel too close to the floor for some people.
Under bed clearance matters too. If you plan to use storage boxes underneath, measure their height and compare it with the gap between the floor and the underside of the slats.
Once you have your measurements, these rough pairings can help, though every room is different:
If you are weighing up the room around the bed as well, our wider bedroom furniture UK sale range makes it easier to see how slimmer storage might free up space for a larger frame. And if you are torn between a king size and a double, our king size metal beds UK collection shows overall frame sizes so you can compare them directly with your floor plan.
A bed is rarely the only piece in the room, so measure for it alongside everything else. Bedside cabinets typically sit either side of the headboard, which means the wall needs to accommodate the bed width plus two cabinets plus a little breathing room. Wardrobes, chests of drawers and dressing tables all need their own clearance, too, so mark each of them on your sketch before settling on a bed size.
The mattress affects both comfort and fit. Check that its depth suits the frame: iron beds with a footboard can make a very thin mattress look lost, while an extremely deep one may sit above a low headboard. If you are buying a new mattress alongside the frame, it makes sense to look at modern mattresses UK in the same standard size so the two arrive matched.
For a detailed look at frame, mattress and room size working together for larger beds, our article on UK king size bed dimensions for frame, mattress and room is a useful next read. Our guide to bedside table measurements for UK bedrooms then explains how to get cabinet heights and widths working with the bed.
Before ordering, run through this list:
Taking ten minutes to do this properly saves a lot of frustration later. An iron bed is a long lasting piece, so it is worth getting the size right from the start. You can explore the full collection and our wider bedroom ranges at Furniture in Fashion, with free delivery to most UK mainland postcodes.
It depends on the design. Simple frames may add only a few centimetres to each dimension, while traditional beds with large posts and footboards can add considerably more, particularly to the length. Always check the external frame dimensions before buying.
Around 60cm to 70cm on each side you use is comfortable. In a small room you can reduce this slightly, but try not to go much below 50cm if you want to walk past easily and make the bed without difficulty.
Usually, because most iron beds arrive in sections. The headboard is normally the largest piece, so measure its width and height against the tightest turn on your stairs or in your hallway before ordering.
Not always. European mattress sizes are different from UK sizes, so a European mattress may be too wide, too narrow or too long for a UK frame. Measure your mattress and compare it with the frame specification.
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