Gite conversion

[Smudger]

I wonder if you can help me.

I am converting a barn into holiday accommodation and have come to the point where I need to fit the Velux windows in the loft space that will be converted to bedrooms and bathrooms.

I have the planning permission to fit the windows as part of the conversion, however what regulations exist bearing in mind this will be accommodation, not a private residence. Is there any requirement for the windows to be of a certain size to allow escape in case of fire? Rules on safety for children etc. Any pointers would be very helpful before I commit to purchasing the windows.