Why king size makes sense for most couples#

A UK king size mattress (150 × 200 cm) gives each partner 75 cm of sleeping width — 15 cm more than a double per person, and 10 cm more length. For average-height couples, this is a meaningful upgrade. The additional length (200 cm vs 190 cm on a double) also benefits taller sleepers.

King size mattresses are available from virtually every UK mattress brand, with prices typically 20–30% higher than the equivalent double. All prices below are approximate king-size sale prices.

Best overall king: Simba Hybrid (~£900 on sale)#

The Simba Hybrid's combination of medium firmness, good motion isolation (via the micro-spring layer), excellent temperature regulation (dual springs) and strong edge support make it one of the most versatile king-size mattresses for couples in the UK. The 200-night trial lets both partners assess it properly over time.

Best value king: OTTY Hybrid (~£650 on sale)#

OTTY's king-size hybrid delivers genuine hybrid performance at a price that undercuts Simba and Emma by a meaningful margin. The 5 cm gel-foam comfort layer provides pressure relief, the pocket-spring base provides support and airflow, and the bamboo cover is breathable. Best-value king-size hybrid in the UK market.

Best premium king: Brook + Wilde Elite (~£1,000–£1,200)#

Brook + Wilde's availability in soft, medium and firm at king size is a significant advantage for couples — you can order two king-size singles in different firmnesses and zip them together for a bespoke sleep surface. The natural wool fillings and dual spring system also make it one of the coolest-sleeping kings in the mid-premium segment.

Best memory foam king: Nectar Original (~£550 on sale)#

For couples who prioritise motion isolation over temperature, Nectar's king size all-foam mattress provides the best pressure relief and movement absorption in the sub-£600 king tier. The 365-night trial is especially valuable at king-size price points where a poor fit is more costly to resolve.

Buying tips for king size#

  • Measure your room first: Allow at least 60 cm clearance on each side of the bed and at the foot. A 150 cm wide king in a 10′ (304 cm) wide room leaves only 77 cm on each side — workable but snug.
  • Check stair access: Full-size king mattresses (even compressed) require adequate stair and door clearance. Measure before ordering if you're in a flat above ground floor.
  • Buy the base at the same time: King-size bases need to match the mattress size exactly. Mixing brands is fine as long as dimensions align.