As to whether you require planning permission depends on many factors. For general guidelines go to www.planningportal.gov.uk
where advice is available.
Specifically for Nottingham, try www.plan4nottingham.com
If you have a particular project in mind and providing you can provide your local council with basic details, they will advise you.
If you do require Planning Permission then you will need drawings showing:
- Existing plans and elevations
- Proposed plans and elevations
Cadplan provide a service which specialises in providing these drawings.