UK Long Double Mattresses
The UK long double (135 x 200cm) is a standard double with king length: the fix for couples who like their room layout but not the short mattress.
Why choose a long double?
- You get king length at double width: an extra 10cm of legroom in a familiar footprint.
- It suits taller couples in rooms that won't take a king's extra 15cm of width.
- The width matches the 135cm double you may already own, so the room layout stays the same.
- A standard double headboard still matches the width.
Allow at least 2.6m x 2.9m; use 135 x 200cm fitted sheets from specialist ranges, with a standard double duvet.

Emma Original Mattress
Why choose a long double?
- You get king length at double width: an extra 10cm of legroom in a familiar footprint.
- It suits taller couples in rooms that won't take a king's extra 15cm of width.
- The width matches the 135cm double you may already own, so the room layout stays the same.
- A standard double headboard still matches the width.
Allow at least 2.6m x 2.9m; use 135 x 200cm fitted sheets from specialist ranges, with a standard double duvet.
How big is a long double mattress?
135 x 200cm: standard UK double width with king length.
Long double or king?
A king adds width as well as length. The long double is for rooms where the extra 15cm of width won't fit but a sleeper needs the legroom.
What bedding fits?
135 x 200cm fitted sheets from specialist ranges. A standard double duvet covers the top.
Will a long double fit my double bed frame?
Only if the frame has a 200cm internal length. Most UK double frames are built for 190cm mattresses, so a long double usually needs a long frame or a divan base to match.