min size for ensuite

[smuglilal]

want to put an ensuite in my attic bedroom this is not a conversion i have a large attic room with sloping roof are there any regs to size and height the ensuite would be by the sloping ceiling

[eljaybee]

The simple answer is no (only restriction on headroom in regs is for staircase and escape routes) but you need to consider the issue of practically being able to use all of the facilities.