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.
