Do I need approval to put rooms in the roof space?

Answer: 

Yes. Whatever the intended purpose of the room(s), it will be necessary to make a Full Plans or Building Notice application. Often the nature of these works is quite complex and requires the deposit of structural calculations and a complete assessment of the provisions for means of escape. It is therefore highly recommended that you use the Full Plans procedure.

This advice relates solely to Building Control Opens in a new window matters and you should consult the planning pages of the website or the planning portal Opens in a new window website for advice on planning matters.