Planning - Your Questions
Some developments, such as garden sheds, garages and house extensions can be classed as "permitted development" and don't need planning permission provided they meet certain criteria. Planning Officers can advise you on whether or not a proposal needs planning permission. They can also advise on what the Council is likely to accept or reject with reference to current planning policy.
Planning Permission - General Questions
The Planning Toolbox is a short, concise but comprehensive document which will answer most if not all questions that you may have.