In the unfortunate event of your planning permission being refused, you may be able to submit another application with modified plans free of charge, as long as it’s 12 months of the decision of your original application. If you believe the authority’s decision was unreasonable you may want to appeal.
Appeals are intended as a last resort, and they take several months to decide. It may be quicker to discuss with the authority whether changes to your proposal would make it more acceptable or, in cases of non-determination, when your application might be decided if you choose not to appeal.
The deadline for submitting an appeal is six months from the date of the application decision letter or in the case of non-determination, six months from the date the decision should have been made.