A habitable room is defined as a room used for dwelling purposes but which is not solely a kitchen, utility room, bathroom, cellar or sanitary accommodation. So this will include other bedrooms but not adjacent bathrooms or hallways. If it’s an en-suite off your bedroom, you don’t have to insulate any stud walls that are in your bedroom only the ones between your loo & other habitable rooms (bedrooms). Basically, you can hear your own *arts but the folks in the next bedroom mustn’t!
How old is your drainage system? BR’s may have changed since it was built & if you make any changes, they have to comply with current regs. A loo at ground floor level can discharge directly into a drain invert (the horizontal bit under the ground) providing it’s within 1.3m of the base of the loo but the foul drain system should have an open vent somewhere else if there are ohter loos or waste discharge; it may currently be venting through the outside gulley if it’s open but I think those are only allowed on surface (rain) water now, not foul drain systems but I’m not certain. Are there no other loos in your property?
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