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Moving up to a king or super king bed frame is one of the biggest comfort upgrades you can make in a bedroom, but it's also one of the easiest to get wrong on measurements alone. Here's how king and super king frames actually compare, what to check before you buy, and which of our own large-format frames are worth considering.

King vs Super King: The Actual Dimensions

A UK king size bed frame measures 150cm x 200cm, while a super king measures 180cm x 200cm — the extra 30cm of width on a super king is roughly the width of an extra pillow's worth of space per side, which is a bigger practical difference than the numbers alone suggest. Our UK vs European bed sizes guide has the full comparison table if you're weighing up sizes from other markets too.

Do You Need a Bigger Frame, Not Just a Bigger Mattress?

It's tempting to think of sizing up as simply buying a bigger mattress, but the frame itself needs to match — a bigger frame means a taller, wider headboard, more substantial legs and side rails to support the extra span, and, in upholstered designs, proportionally more fabric to keep the look balanced rather than stretched thin.

Room Size Considerations

Minimum Clearance

As a rule of thumb, aim for at least 60-70cm of clear walking space on at least one side of the bed and at the foot, so the room doesn't feel cramped and furniture like wardrobes remain fully accessible. Our guide to measuring your bedroom walks through exactly how to check this before ordering.

Doorways and Access

Large bed frames, particularly upholstered ones with a solid headboard, can be awkward to get up stairs or through narrow doorways in one piece — check whether the frame ships flat-packed or assembled, and measure your access route, not just the bedroom itself.

Who Benefits Most From King or Super King

Couples, especially where one partner moves a lot in their sleep, tend to notice the biggest benefit from sizing up, since more space reduces disturbance from a partner's movement. Taller sleepers also benefit from the extra length built into most king and super king frames compared with a double. Our best mattress for couples guide and best beds for tall people guide cover both of these in more depth. If even a super king isn't quite enough room, our Emperor bed guide covers the next size up.

Our King & Super King Picks at Bed Innovation

Royal Panel Bed Frame
A premium upholstered panel design built specifically with king and super king proportions in mind.

The DaVinci Bed
A large-scale, sculptural design that carries its full size with real presence in a bigger bedroom.

Browse the full range in our bed frames collection.

Frequently Asked Questions

What room size do I need for a super king bed?

Most guidance suggests a minimum room size of around 3.5m x 3.5m for a super king to leave comfortable clearance on both sides, though this varies depending on other furniture in the room.

Is a super king mattress heavier to move than a king?

Yes, noticeably — the extra 30cm of width adds meaningful weight, particularly with hybrid or pocket sprung constructions, so it's worth having a second person on hand when it's delivered.

Do king and super king bed frames use the same bedding?

No — king and super king require different bedding sizes throughout (sheets, duvet covers, and often duvets), so check the size carefully when buying linen for a super king frame.

Can a super king frame fit through a standard UK doorway?

Most flat-pack super king frames are designed to fit through standard doorways once disassembled into panels; fully assembled or solid-frame designs may need a wider access route, so it's worth checking with us before ordering if you're unsure.

Is it worth paying more for a super king over a king?

If two people share the bed and space is available, most people find the extra width worth it long-term for sleep quality, though a king is a reasonable middle ground if room size or budget is tighter.

Final Thoughts

Sizing up to a king or super king frame is as much a room-planning decision as a furniture one — measure carefully, check your access route, and choose a frame built to properly support the extra span rather than just a bigger mattress on a standard frame.