Beds and Mattresses: The Complete Guide

Buying a bed looks simple until you start. Then you find a king in one shop isn’t the same as a king in another, that a mattress can advertise three thousand springs and still feel like a plank, and that your existing sheets might not stretch over the new one. So here’s the long version. Take what’s useful and skip the rest.

What are the UK bed sizes, and how much room does each one need?

Six standard sizes, set out by the National Bed Federation, and nearly every frame and mattress sold here follows them. So a UK double mattress fits a UK double frame whoever made either one.

The room sizes below are my rule of thumb, not an official standard. I’ve allowed 60 to 75cm of clear floor on any side you walk down, plus room for a wardrobe door. You can squeeze a bed into less. You just won’t enjoy it at three in the morning.

A small double is only 15cm narrower than a double, which doesn’t sound like much until two adults share it: seven and a half centimetres each, and you feel every one. Double to king adds 15cm of width and 10cm of length, and the length matters if either of you is over about six foot. A super king is near enough two singles side by side, which is why zip-and-link sets exist. If 200cm still isn’t long enough, some makers do beds at 215cm (7ft), though bedding for those is a hunt.

There’s a fuller breakdown in our UK bed sizes explained guide, and if the room is the problem rather than the money, beds for small bedrooms covers the layouts that work.

Why don’t UK sizes match European and American ones?

Because they grew up separately and nobody has ever sorted it out. European sizes are wider and 10cm longer than ours: a continental single is 90 x 200cm, a continental double 140 x 200cm, a continental king 160 x 200cm. So a European double is 5cm wider and 10cm longer than a UK one. Not enough to spot in a photo. Plenty enough to leave a fitted sheet skidding off the corners.

American sizes are further out again. A US queen is 60 x 80 inches (152 x 203cm) and a US king 76 x 80 inches (193 x 203cm), so a US queen is roughly as wide as our king and a US king is wider than our super king. That’s also why “queen” turns up on British listings meaning a small double, and means something else entirely in America.

Here’s where it bites: you order bedding online, the listing says king, and it ships from a seller working to continental measurements. It’s rarely a scam, just two different rulers. Ignore the name and read the centimetres, and if a listing gives you a word and no numbers, look elsewhere.

Which bed base should you choose?

The base decides how the bed feels, how much storage you get, and whether it can be carried up your stairs.

• Divan. A fabric-covered box, usually two halves that bolt together, mattress on top. Sturdy, and easy through a doorway because it splits. Storage means two or four built-in drawers, which need clear floor beside the bed to open, so in a narrow room the wall-side ones are decorative.
• Ottoman. The whole platform lifts on gas struts over a full-length storage well. It holds far more than drawers and needs headroom above rather than floor space beside. In exchange it’s heavier, dearer, and you heave the mattress upright every time you want the decorations down.
• Bedstead. The traditional frame with headboard, footboard and slats. Air circulates underneath, which mattresses like, and underbed boxes fit. Sprung slats feel softer, rigid slats firmer. The mattress sits inside the frame, so internal dimensions are the ones that matter.
• Platform base. A solid or close-slatted top with no give in it. Everything you feel comes from the mattress, which suits people who dislike bounce. Less ventilation, so don’t shove the bed hard against a cold outside wall.

If you’re weighing storage against cost, divan vs ottoman vs bed frame goes into it properly.

What are the mattress types, and what’s the honest trade-off?

Open coil. One continuous wire spun into linked springs. Cheapest, light to move, fine for a spare room. Because the springs are linked they move together, so when one of you turns the other knows about it, and they soften unevenly sooner.

Pocket sprung. Each spring sits in its own fabric pocket and moves independently, so a heavier hip and a lighter shoulder get supported differently and there’s far less disturbance when someone shifts. Better airflow than foam, heavier to handle, and the good ones cost more.

Memory foam. Softens with body heat and moulds to your shape, which suits a lot of people for pressure on hips and shoulders. Two honest drawbacks: it holds heat, and changing position is more work because you’re climbing out of a dip. New foam also smells for a few days.

Latex. Springier and more responsive than memory foam, without the clinging. It breathes well and lasts, and it’s expensive and very heavy. Check whether a listing means natural or synthetic, because the words get used loosely and the prices don’t.

Hybrid. Pocket springs below, foam or latex above. Most work well, but the word isn’t regulated, so it covers everything from a serious spring unit with a proper foam layer to a cheap coil with two centimetres glued on. Read what’s actually inside.

If you overheat at night, the best mattress for hot sleepers is worth reading before you commit to solid foam.

Do spring counts actually mean anything?

A bit, then not much, then they start being misleading.

First, a quirk: UK spring counts are always quoted for a king size, so a single advertised as 1,000 pocket springs doesn’t contain a thousand. It’s built from the same spring unit and holds proportionally fewer. Standard practice, not a con, but it surprises people.

Second, there’s a physical ceiling. Around 2,000 full-size springs is the most you can fit into a single layer of a king. Above that, something else is going on: smaller springs, stacked layers, or mini and micro springs added in rows purely to lift the headline figure. Those compress almost instantly under an adult’s weight, so a 5,000-count mattress isn’t two and a half times better than a 2,000.

Third, every extra layer takes room that would otherwise hold comfort filling. Between 1,000 and 1,600 full-size springs covers most people. Spring count is the easiest number to print and one of the least useful.

What does “medium firm” really mean for your body?

Less than the label suggests. There’s no British Standard for firmness and no test a mattress has to pass, so each manufacturer decides where its own scale sits, and one brand’s medium is another’s firm.

Your weight changes it too. Ratings are generally set against an average adult of around 11 to 13 stone. Lighter than that and you won’t press far enough into the comfort layers to reach the support beneath, so a medium feels firm. Heavier and you compress straight through to the springs, so the same mattress feels softer than advertised.

Roughly: side sleepers and lighter people want something softer, so shoulder and hip have somewhere to sink. Front sleepers want firmer, so the hips don’t drop and hollow the lower back. Back sleepers land in the middle. Couples with a big weight difference are the hardest case, and pocket springs or a zip-and-link set handle it better than one slab of foam.

On backs, what people commonly report is that a mattress keeping the spine roughly level, neither sagging under the hips nor holding them rigidly high, feels better in the morning. That’s what people find, not a treatment. If you have back pain that keeps returning or wakes you, please see your GP or a physiotherapist. A mattress isn’t a medical device and I won’t sell you one as though it were. Our mattress firmness guide goes through the scales in more detail.

Why does mattress depth catch people out?

Because mattresses have quietly got deeper while the bedding in people’s cupboards hasn’t. Modern mattresses run from about 18cm to over 35cm. A standard fitted sheet has roughly a 30cm skirt and covers a mattress of 20 to 35cm. Extra deep sheets are around 38cm, ultra deep about 46cm for mattresses of 40 to 60cm. Add 5 to 8cm to your mattress depth so there’s enough left to tuck under, and if you use a topper, measure mattress and topper together.

Depth also decides how high you sit, so add base height to mattress depth before you order: a deep mattress on a tall divan makes a high bed. Toppers, protectors and bedding are easier to choose once you know that number.

Do you still need to turn a mattress?

Rotate, yes. Flip only if it’s two-sided, because plenty of modern mattresses have all the comfort layers built into the top and turning one of those over means sleeping on the base.

The National Bed Federation’s advice is clear. For a one-sided mattress, rotate it head to foot weekly for the first three months, then monthly. For a two-sided one, alternate rotating and flipping each week for three months, then alternate monthly. Those early months matter because that’s when the fillings settle, and even settling is what stops dips forming where you lie.

They also suggest airing a mattress well before use and gently vacuuming it now and then. Pulling the covers back for half an hour before you make the bed does more good than it sounds like it should.

How long should a mattress last, and how do you know it’s finished?

You’ll see “replace every seven years” quoted everywhere. It’s a trade rule of thumb rather than a finding, and the NBF itself doesn’t put a number on it: their line is that a bed’s lifespan depends on the care it gets. Less tidy, but fairer. The signs are more useful than the years anyway. The NBF points to lumps and bumps, creaks and crunches, and waking with a sore back. I’d add:

• A visible dip where you lie, or a ridge down the middle if two of you sleep either side of it
• Sleeping noticeably better in a hotel or at somebody else’s house
• Rolling towards your partner without meaning to
• Edges that collapse when you sit on them to put your socks on

If stiffness or pain persists, that’s one for your GP rather than a shopping decision. And honestly, a cheap mattress that gets rotated and protected will often outlast an expensive one left alone. A washable protector from day one is the least glamorous, most worthwhile thing you can buy.

Will it actually get up your stairs?

This is the step people skip and the one that causes most grief on delivery day. Before you order, measure every doorway on the route including the front door, the narrowest point of the stairs, the turn at the top or on the half landing (usually tighter than the flight itself), and the ceiling height over the stairs.

Divans and bedsteads come apart, so they’re rarely the problem. Mattresses are, particularly deep pocket sprung and latex ones, which are heavy and won’t bend. Foam mattresses often arrive roll-packed in a box, which solves access neatly, though once unrolled they can’t go back and need a day or two to expand fully. If access is genuinely tight, say so when you order rather than after, and take the bedroom door off its hinges the night before if you’re unsure.

What do you do with the old mattress?

Don’t leave this to the day itself, or you’ll have a mattress propped against the shed for a month. They can’t go in a wheelie bin, and most councils charge for bulky waste collection, with prices and waiting times that vary a lot by area. Some household waste recycling centres take them free if you can get one there, which is a large if. The National Bed Federation runs mattressdisposal.co.uk, where you can look up what your own council offers.

The NBF estimates councils handle over 6.4 million mattresses a year, and the recycling picture is wildly uneven: more than 86% of Welsh councils send mattress components for recycling, while in parts of England it’s as low as 11%. The NBF is working towards 75% being diverted from landfill by 2028.

Many retailers will take the old one away on delivery for a fee, which is usually easiest. If yours is genuinely still good, some charities will take it, though the fire safety label has to be intact. Never fly-tip one: the fines are substantial and it comes back to you.

What if you can’t pay for it all at once?

Most people can’t, and there’s nothing to be embarrassed about there. A bed is a genuine household essential, and one of the few things where going too cheap tends to cost you again in a couple of years.

At Pay it Your Way you can spread the cost weekly or monthly through Snap Finance, so the bed arrives now and the payments sit at a level agreed up front. Applications are subject to status and affordability checks, you’ll need to be 18 or over and a UK resident, and approval isn’t guaranteed. Indoor Living Ltd is a credit broker, not a lender. Our how it works page runs through the steps plainly.

My advice on the money is the same as on the mattress: work out what you can genuinely afford each week before you fall in love with something, then shop inside that number.

So where do you start?

Measure the room and the access first, because those rule out more options than budget does. Settle on a size, decide whether you need the storage, then choose the mattress on type and firmness rather than spring count. Sort the old mattress before delivery day, and rotate the new one from week one.

You can browse the range in beds and mattresses, and if it’s a child’s room you’re planning, bunk beds and kids’ beds covers the safety side. If the bedroom’s sorted and the living room is next, the sofa range is over here, and there’s more of this sort of thing on Where there’s a will, there’s a way.

Common questions