A house would also be the butlers or housekeepers workplace so I say the RRO would apply anyway
Not in my opinion Clevelandfire, a butler or housekeeper does not make a house a non domstic premises, the Order would not apply in that case. The guidance that was given in circular 28 for the Workplace Regs is still relevant.....
"6. The meaning given to the term "domestic premises" under the Fire Regulations is that given to it by section 53(1) of the 1974 Act – essentially premises occupied as a [single] private dwelling. Such are excepted from the term "workplace", so that the Fire Regulations do not cover those employees who are homeworkers or who work as a domestic servant in a private dwelling. Nor do they cover employees who are district nurses, telephone engineers, gas fitters, etc. when they are working in excepted premises. Also, the Fire Regulations do not cover voluntary workers (i.e. those without a contract of employment or apprenticeship as defined in paragraph 5 above). They do, however, apply to any part of residential premises, including hotels, nursing homes, houses in multiple occupation and like premises, which are used in common by the occupants of more than one private dwelling, where caretakers and similar persons, being employees, work, as well as to any part of premises where so-called "domestic" staff are employed, such as the kitchens of hostels or sheltered accommodation. That is to say, any part of residential premises, other than premises occupied as a private dwelling, in which employees work is a workplace. "
In my opinion of course.