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Small Double Mattresses

The small double is an easy size to overlook. It sits between the single and the double, and people often dismiss it in both directions: a single f...
The small double is an easy size to overlook. It sits between the single and the double, and people often dismiss it in both directions: a single feels adequate, a double feels like the proper choice. But there are rooms and situations where a small double is specifically the right answer, and buying the wrong size at either end means either a mattress that's not comfortable or a bed that doesn't fit the room. If you're in that middle ground, it's worth understanding what 120cm actually gives you before defaulting to a different size.
The small double mattresses here cover pocket spring and memory foam constructions in the standard 120cm wide by 190cm long size. They sit within the full mattresses collection if you'd like to compare across all sizes. All are delivered across the UK in 7 to 14 days.
Finance is available on many mattresses, subject to status. Get in touch if you'd like to talk through the options before ordering.

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What's in this collection

The small double mattresses here include pocket spring and memory foam constructions, with some hybrid options combining both.

Pocket spring mattresses use individually wrapped coils that respond independently, absorbing movement and allowing air to circulate through the mattress structure. They're a reliable choice across a range of body weights and sleeping positions, and the natural breathability keeps the sleeping temperature consistent. For a spare room or a bedroom used by a teenager, pocket spring is a practical, low-maintenance option.

Memory foam compresses under heat and pressure to distribute weight more evenly across the surface, reducing load at pressure points like the shoulder and hip. Hybrid options layer memory foam comfort over a pocket spring base, which offers pressure relief at the surface while retaining the airflow and support of a spring structure underneath.

Who a small double suits

The small double works particularly well for a solo sleeper where the bedroom is on the smaller side. At 120cm wide, it's 30cm more than a single, which gives a meaningful improvement in how comfortable a single person feels in the bed without adding as much to the room footprint as a full double. For someone who moved out of a single years ago and has been making do, or who is setting up a first bedroom and wants something genuinely comfortable rather than just adequate, the small double is often the right size.

It's also a strong choice for a teenager's bedroom. A single mattress suits younger children well, but by the mid-teens a single starts to feel restrictive, and a small double gives a more adult sleeping surface that will remain suitable for years, including if they move it to a flat or first home later. Unlike a full double, it fits into a standard teenager's bedroom without dominating the room or squeezing out desk and wardrobe space.

For a spare room, a small double is often genuinely more practical than a single for guests, while fitting into rooms where a double base would crowd the space. A single guest has a comfortable, properly sized bed; a couple wanting to share it would be tight, but for a room that primarily hosts one person at a time, it's a sensible size.

Small double dimensions and room fit

A UK small double mattress is 120cm wide and 190cm long. The width is the defining characteristic: 30cm more than a single, 15cm less than a full double. The length is identical to both, at 190cm.

Once the bed frame is included, allow around 130cm of floor width for the assembled bed as a working guide. For room planning, a small double fits comfortably in a bedroom of around 2.5m x 3m or larger with reasonable clearance on both sides. It's a noticeably more manageable footprint than a full double in rooms that are genuinely compact.

If you're buying a mattress to pair with a new base, the small double bed frames collection shows the available options with their full assembled dimensions.

Spreading the Cost

Finance is available on many of our small double mattresses, subject to status. A mattress is one of those purchases where choosing on quality rather than on minimum spend tends to pay off over the years of use it'll get. Spreading the cost makes it easier to make that decision properly. Details are shown on each product page.

Why buy from Shawcross

We're a Manchester-based retailer with a showroom and we deliver nationally across the UK. If you're not sure whether a small double or a different size is the right call for your room and situation, we're happy to help you work it out before you order. Give us a call or come into the showroom.

Small Double Mattress FAQs

What are the dimensions of a small double mattress?

A UK small double mattress is 120cm wide and 190cm long. It's sometimes called a four-foot bed, referring to the approximate width in imperial measurements. The size is standardised across all manufacturers, so any small double mattress will fit any small double base regardless of brand.

The small double is 30cm wider than a standard single, which sits at 90cm, and 15cm narrower than a full double at 135cm. The length is the same across single, small double, and double at 190cm. Only king and super king add extra length at 200cm. If you're unsure which size you currently have, measuring the inside of the base from edge to edge will tell you: 120cm or just under confirms a small double.

Small double or double: how do I decide?

The main factors are room size, who's sleeping in it, and how long you expect the mattress to stay. For a solo sleeper with a compact bedroom, the small double is often the better fit: it gives a comfortable sleeping surface without taking up floor space the room doesn't have. For a solo sleeper in a larger room with no particular space constraint, the extra 15cm of a double mattress is worth having if the budget allows.

The situation where the small double starts to show its limits is if there's any realistic chance of two people sharing it regularly. At 120cm, a couple has 60cm each, which is workable for an occasional night but noticeably cramped over time. If shared use is a real possibility rather than a theoretical one, a double is the more practical starting point.

For a teenager, the small double is usually the right size unless the room is genuinely spacious enough for a full double without compromise. It's a proper adult sleeping surface that will move with them if they leave home, and it fits into most standard UK bedrooms without the trade-offs a full double can create in a smaller room.

Is a small double big enough for two people?

At 120cm, two adults sharing a small double have 60cm each. That's enough for a night, but it's not a comfortable long-term arrangement for two people sharing a bed regularly. A standard double at 135cm, giving 67.5cm per person, is the minimum size most couples settle into, and even that has limits compared to a king.

If you're buying a small double for a spare room where two people might occasionally share, it's honest to say they'll manage rather than be comfortable. If two people sharing it regularly is the plan, a full double is worth the extra footprint wherever the room allows it.

Does small double bedding fit a small double mattress?

Small double bedding is a specific size and won't be on the shelf in every high street shop, but it's widely available online and in most larger bedding retailers. It's worth buying the correct size rather than trying to use single or double bedding. Single bedding won't cover the mattress properly; double bedding will be too large and will bunch and shift during the night.

When buying sheets, check that the depth of the fitted sheet matches the depth of the mattress. A standard fitted sheet works for mattresses up to around 25 to 30cm deep, but a deeper mattress needs a deep-fill fitted sheet to stay in place. Check the mattress depth in the product specification and match it to the sheet's pocket depth before buying.

Is a small double a good size for a spare room?

It depends on the room and how the spare room gets used. For a room that primarily accommodates single guests, a small double is a genuinely comfortable size that gives a visitor a proper bed rather than a single they'll feel slightly squeezed in. It fits into smaller spare rooms that can't take a full double base without compromising the rest of the room, and it doesn't require guests to bring their own sleeping bags.

For a spare room that regularly accommodates couples, a full double is a more honest choice. A couple in a small double for more than the occasional night will notice the space. If the room is large enough for a double, the double is the better investment for that use case. If the room genuinely can't take a double comfortably, a well-specified small double is still a much better guest bed than a single.

How does delivery work, and can I see mattresses in person first?

We deliver nationally across the UK. Once your order is placed you'll receive a confirmation, and we'll be in touch closer to the time to arrange a delivery date that suits you. Small double mattresses are delivered in 7 to 14 days. They arrive in protective packaging and the delivery team will bring them into your home. If there's anything about your property worth noting in advance, such as a narrow staircase or a tight corner, let us know when you order so the delivery team can prepare.

If you'd like to see mattresses in person before committing, our Manchester showroom carries a selection and you're welcome to come in without any obligation. Give us a call beforehand to check what's currently on the showroom floor.