I live in a ground floor maisonette. I am thinking of splitting my large lounge into 2 bedrooms. If I split it width ways ( which is the preferred choice ) only one of the bedrooms will have a window. I read on another site all bedrooms need a window but in the building regulations 2.3 it states all habitable rooms on the ground storey should either open directly onto a hall leading to a suitable exit or to be provided with a window. Which is correct? Can anyone point me in the direction of a definitive answer ? Thanks in advance !!!