King Size Mattresses

What are the dimensions of a king size mattress?

A king size mattress measures 5 feet in width and 6 feet 6 inches in length (150cm x 200cm). Our 2026 Sleep Survey found that 62% of UK adults share a bed with a partner, and a king gives two adults room to sleep comfortably. There's also a little extra stretching space for solo sleepers who want it.

What firmness levels are available for king mattresses?

Selecting a king-size mattress that aligns with your sleeping position and comfort preferences can enhance sleep quality and comfort at night. Our king size mattresses come in all firmness ratings to suit any sleeper. Choose from:

• Soft: Great for lighter sleepers or couples who move around while they sleep, a soft mattress can help with movement transfer and gives a cushioned feel.
• Medium: Well-suited to side sleepers, a medium-firm mattress helps reduce pressure points while still offering support.
• Firm: Ideal for both front and back sleepers, firm mattresses help maintain spinal alignment.
• Extra firm: Often preferred by heavier individuals and those with joint or back pain, these offer extra support.

To find the mattress of your dreams, take our Sleepmatch quiz today.

What types of king size mattresses can I choose from, and which one is best for me?

Choosing the right type of king mattress is equally as important as the firmness. Our mattress collection includes:

• Memory foam king size mattresses: Providing excellent pressure relief, these mattresses contour to the shape of your body for personalised support.
• Pocket sprung king size mattresses: Ideal for those who are easily woken by their partner’s movement, these mattresses feature individually wrapped springs to reduce motion transfer.
• Latex king size mattresses: Naturally anti-allergy, these mattresses help keep you cool throughout the night, perfect for hot sleepers.
• Gel king size mattresses: This material moulds to the body to provide tailored comfort while helping to regulate temperature and enhance breathability.
• Natural king size mattresses: Choose from wool and cotton king size mattresses, offering hypoallergenic and moisture-wicking properties.
• Hybrid king size mattresses: Perfect for couples, these mattresses offer the benefits of pocket spring support and memory foam comfort with added motion isolation.
• Traditional spring king size mattresses: Offer support and comfort at great value.

What brands of king mattresses are available?

Explore our range of king size mattresses from renowned brands like Silentnight, TEMPUR, and Sealy. Experience the luxury of our Dream’s Workshop king mattresses, handcrafted in the UK with premium springs for exceptional comfort. Or discover our exclusive king size mattress collection with House Beautiful, expertly designed by style professionals to elevate your bed.

Do your king size mattresses come with a warranty?

Yes, every king size mattress comes with our 100-night comfort guarantee, giving you up to 100 nights to try it out and make sure it’s the perfect fit. If it’s not, we’ll help you find one that’s better suited to you so you can enjoy a perfect night’s sleep.

Can you help me recycle my old king mattress?

Absolutely! Our expert delivery team will collect your old king size mattress and ensure it's responsibly recycled, clearing the way for your new one. This will be done before your free mattress delivery, so there’s plenty of space for your new bed. Learn more about our recycling service.