Planning permission is not normally required. However, permission is required where you extend or alter the roof space and it exceeds specified limits and conditions.
Under new regulations that came into effect from 1 October 2008 a loft conversion for your house is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:
If you require architectural drawing services we would recommend TLC Planning and Design, part of The TLC Group.
TLC Planning and Design provide services for both residential and commercial clients in North London, Essex, Hertfordshire and the surrounding areas. Including design and planning for home renovations, extensions, garage conversions, loft conversions and new builds.
For your building planning and design needs visit the TLC Planning and Design website.