Double Mattresses (4ft 6)

Is a Standard Double Mattress Right for You?

A standard UK double mattress measures 135cm wide by 190cm long. It remains the UK's best-selling mattress size because it fits beautifully into standard primary bedrooms without dominating the floor plan.

• For Everyday Couples: Providing 67.5cm of space per person, a standard double is the ideal primary bed for couples who naturally sleep closer together. (Expert Tip: If you or your partner toss and turn, consider upgrading to a King Size Mattress for undisturbed rest).

• For Adult Solo Sleepers: If you sleep alone but want a premium, hotel-like experience every night, a double mattress gives you total freedom to stretch out without your feet or arms hanging over the edge.

Standard Double (4ft 6") vs. Small Double (4ft)

Not sure if you need a standard double? It’s a common mix-up! A standard double is 135cm wide, meant for everyday adult or couple use. If you are outfitting a tighter guest room, a studio apartment, or a teenager's bedroom, you actually need our Small Double Mattresses. These are 15cm narrower (120cm wide), making them the true space-saving hero for restricted layouts and smaller rooms.

Choose a Mattress Type That Solves Your Sleep Struggles

Because we stock the largest range of double mattresses in the UK, you never have to settle for a "one-size-fits-all" feel. Our Sleep Experts have broken down how different materials benefit you:

• Pocket Sprung Mattresses (Stop the "Roll-Together"): The gold standard for couples sharing a double. Because each spring acts independently, it absorbs your partner's movements. You stay fast asleep, even if they get up before you.

• Memory Foam Mattresses (Soothe Aching Joints): This material uses your body heat to mould exactly to your shape. It provides a customised "hug" that relieves pressure on your hips and shoulders, ensuring you wake up loose and pain-free.

• Hybrid Mattresses (Cooling & Bouncy): Combines the breathable, responsive bounce of springs with the deep cushioning of foam or gel. Ideal for hot sleepers who want the best of both worlds.

• Orthopaedic Mattresses (Targeted Back Support): Firmer by design, these are rigorously tested to promote a neutral spinal alignment, making them the ultimate choice for chronic back pain sufferers.

Expert Advice: How Firm Should Your Mattress Be?

Your sleeping position dictates your ideal firmness. Choosing correctly is the difference between waking up refreshed or waking up stiff. (Read our full Mattress Firmness Guide).

• Side Sleepers (Soft to Medium): You need deep cushioning to allow your shoulders and hips to sink in, keeping your spine perfectly straight.

• Back Sleepers (Medium to Firm): You require structured support to fill the gap in your lower back (lumbar) while keeping your spine aligned.

• Front Sleepers (Firm): You need high resistance to stop your hips from dipping into the mattress, which prevents lower back strain.

What size is a double mattress in cm?

A standard UK double mattress is exactly 135 x 190cm. Always double-check your existing frame dimensions before buying. For a full visual breakdown, view our Ultimate UK Bed and Mattress Size Guide. 

Do I need a new bed frame to keep my warranty valid?

If your bed is structurally sound, you can save money by keeping your current frame. So whilst not absolutely necessarily to keep your warranty valid, your mattress needs a solid foundation to perform properly. If you are keeping your current Double Bed Frame or Double Divan Base, our experts highly recommend checking your slats to ensure they are no wider than 75mm (3").

• Crucial Expert Tip: Ensure the gaps between your wooden slats are no wider than 75mm (3 inches). Gaps wider than this will cause your new mattress to bulge and sag, which permanently damages the springs and voids your manufacturer’s warranty.

How much should I spend on a good double mattress?

Because a standard double is typically used as an everyday primary bed, a high-quality model usually ranges from £300 to £1,000+. We recommend viewing this as an 7-8-year investment in your daily health, mood, and productivity. 

Will a double mattress stop me from feeling my partner move?

Because a standard double provides 67.5cm of space per person, you naturally sleep quite close together. If you or your partner are restless sleepers, a traditional "open-coil" mattress will likely transfer that movement across the bed, waking you up.

• The Honest Solution: To guarantee undisturbed sleep on a double bed, you must choose a Pocket Sprung mattress (where springs absorb movement individually) or a Memory Foam mattress (which deadens motion entirely).

Will my old double fitted sheets fit my new double mattress?

Not necessarily. While the width and length (135 x 190cm) will be exactly the same, modern double mattresses (especially Hybrids and Pillow-Tops) are often much thicker or deeper than older models, sometimes exceeding 30cm in depth.

• Check the "Depth" on the product page before you buy. If it is over 25cm, we highly recommend upgrading to "Deep Fitted" double sheets to stop your bedding from frustratingly pinging off the corners in the middle of the night.