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King Size Mattresses

King size mattresses offer complete comfort. Forget sleeping like sardines, you and your other half will never argue about bed hogging with this 5’ x 6’6” mattress.

A king size mattress is perfect if you have a large bedroom. Why choose any other than a king size mattress if you’ve got the space to play with? You’ll sleep better at night as you’ll have the freedom to toss and turn without disturbing your partner’s sleep.

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  1. SUMMER SALE
    Richmond 3000 Pocket Sprung Natural Fillings Mattress
    Richmond 3000 Pocket Sprung Natural Fillings Mattress
    (48)
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    RRP From £449.99 Save £200 Now From £249.99
  2. SUMMER SALE
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    Signature 2000 Pocket Sprung Pillow Top Natural Fillings Mattress
    (137)
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    RRP From £549.99 Save £270 Now From £279.99
  3. SUMMER SALE
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    Neptune Spring Quilted Cotton Fabric Mattress
    (152)
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    RRP From £189.99 Save £70 Now From £119.99
  4. SUMMER SALE
    Imperial 3500 Pocket Sprung Mattress
    Imperial 3500 Pocket Sprung Mattress
    (26)
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    RRP From £399.99 Save £180 Now From £219.99
  5. SUMMER SALE
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    Premier Spring Quilted Fabric Mattress
    (40)
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    RRP From £159.99 Save £70 Now From £89.99
  6. SUMMER SALE
    Little Champ 800 Pocket Sprung Reflex Foam Orthopaedic Mattress
    Little Champ 800 Pocket Sprung Reflex Foam Orthopaedic Mattress
    (12)
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    RRP From £279.99 Save £130 Now From £149.99
  7. SUMMER SALE
    1
    Windsor 3000 Pocket Sprung Orthopaedic Pillow Top Mattress
    (21)
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    RRP From £919.99 Save £440 Now From £479.99
  8. SUMMER SALE
    1
    Aloe Vera 1500 Pocket Sprung Memory and Reflex Foam Mattress
    (54)
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    RRP From £399.99 Save £180 Now From £219.99
  9. SUMMER SALE
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    Eclipse Pocket Sprung 800 Quilted Fabric Mattress
    (29)
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    RRP From £239.99 Save £100 Now From £139.99
  10. SUMMER SALE
    1
    Pinerest Spring Semi-Orthopaedic Quilted Fabric Mattress
    (95)
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    RRP From £189.99 Save £70 Now From £119.99
  11. SUMMER SALE
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    Tennyson 4000 Twin Pocket Sprung Orthopaedic Natural Fillings Mattress
    (40)
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    RRP From £789.99 Save £370 Now From £419.99
  12. SUMMER SALE
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    Soft Feel 5000 Memory Foam Orthopaedic Mattress Topper
    (20)
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    RRP From £199.99 Save £80 Now From £119.99
  13. SUMMER SALE
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    Gold Tufted Orthopaedic Spring Mattress
    (40)
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    RRP From £189.99 Save £80 Now From £109.99
  14. SUMMER SALE
    Ortho Sleep 1500 Reflex Foam Orthopaedic Mattress
    Ortho Sleep 1500 Reflex Foam Orthopaedic Mattress
    (14)
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    RRP From £249.99 Save £110 Now From £139.99
  15. SUMMER SALE
    1
    Pearl Contour Spring Memory Foam Tufted Mattress
    (12)
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    RRP From £279.99 Save £110 Now From £169.99
  16. SUMMER SALE
    1
    Ambassador 3000 Pocket Sprung Orthopaedic Natural Fillings Mattress
    (20)
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    RRP From £719.99 Save £340 Now From £379.99
  17. SUMMER SALE
    SleepSoul Space 2000 Pocket Spring Pillowtop Mattress
    SleepSoul Space 2000 Pocket Spring Pillowtop Mattress
    (9)
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    RRP From £599.99 Save £260 Now From £339.99
  18. SUMMER SALE
    Lavender 3000 Pocket Sprung Memory Foam Mattress
    Lavender 3000 Pocket Sprung Memory Foam Mattress
    (24)
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    RRP From £399.99 Save £170 Now From £229.99
  19. SUMMER SALE
    1
    Signature Gold 1800 Pocket Sprung Orthopaedic Natural Mattress
    (62)
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    RRP From £399.99 Save £180 Now From £219.99
  20. SUMMER SALE
    1
    Clifton Royale 1000 Pocket Sprung Orthopaedic Mattress
    (22)
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    RRP From £299.99 Save £120 Now From £179.99
  21. SUMMER SALE
    Impressions 6000 Cool Blue Memory and Reflex Foam Orthopaedic Mattress
    Impressions 6000 Cool Blue Memory and Reflex Foam Orthopaedic Mattress
    (18)
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    RRP From £349.99 Save £150 Now From £199.99
  22. SUMMER SALE
    1
    Stress Free 1500 Pocket Sprung Memory and Reflex Foam Mattress
    (21)
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    RRP From £379.99 Save £160 Now From £219.99
  23. SUMMER SALE
    1
    Star Spring Quilted Fabric Mattress
    (29)
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    RRP From £179.99 Save £90 Now From £89.99
  24. SUMMER SALE
    1
    Anti-Bed Bug 1500 Pocket Sprung Reflex Foam Pillow Top Mattress
    (16)
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    RRP From £619.99 Save £290 Now From £329.99

Items 25-48 of 62

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Sleep Like a King on a King Size Mattress

You’re certain to sleep well on a king size mattress, but if you’re after something even more spacious, then consider our super king size mattress range - here at Happy Beds, there’s something for everyone. Browse our selection of king size mattresses today and find the right one for you.

Frequently Asked Questions

  • How big is a king size mattress?

    A king mattress offers the ultimate in luxury and space, measuring 150cm x 200cm, or 5.0ft x 6.6ft. Whether you're a couple who wants extra space at night or just a solo sleeper wanting to sleep like royalty, our king size mattresses are guaranteed to do the job.

  • Are there different fillings available with king size mattresses?

    We offer a range of mattress fillings to suit any sleeping position or support needs, including:

  • What mattress structures are available with king size mattresses?

    The mattress structure you choose can affect how your comfort throughout the night, which is why you should do careful research before purchasing anything. Our king size mattresses included the following structures:

  • Is a king size mattress right for you?

    Forget sleeping like sardines! You and your other half will never argue about bed hogging with these spacious wonders. With more than enough space to toss and turn without imposing on your partner, it’s easy to see why it is a fan favourite. Perfect if you have a large bedroom or if you’re tall and need those extra few inches to avoid your feet hanging off the end, a king size mattress really adds that special touch.

    Are you not sure on whether a king size mattress will suit you best, whether you need some of the special features, or whether you'll have the space to accommodate one? Take a look at our Mattress Buying Guide and our Measuring Guide. to find out more