I agree the guidance seems to have created even more confusion as to what constitutes a roof extension under Class B, or an extension under Class A of the GDPO.
The guidance does appear very ambiguous. As I understand it previously, the regs stated, under B.2 (b)A dormer window shall be constructed so that - , the edge of the enlargement closest to the eaves of the original roof shall, so far as practicable, be not less than 20 cm from the eaves, measured along the roof slope from the outside edge of the eaves. The result of which appeared to suggest that dormer windows that tied into two storey extensions and projected further than the original eaves line, were not permitted development.
However the amended section B.2(bb) has added a further note which states the above and also adds B.2 (aa)(ii) and, other than in the case of an enlargement which joins the original roof to the roof of a rear or side extension, no part of the enlargement extends beyond the outside face of any external wall of the original dwellinghouse. This seems to suggest that in the case of an existing two storey extension, the dormer may be extended over it, thus now being class as permitted development.
If so, surely this would not only be a roof extension but also an extension under Class A, given it links to the rear extension. The drawing attached shows a very large roof extension, which over balances the roof slope of the property. Surely this is not the aim of the legislation?
I guess this also begs the question can the extension be considered under both Class A and B of the regs?
I too would like to know if anyone had any further thought on the matter.
Mary-Ann
