The differences between the requirements for the content of applications and accompanying documents for planning permission in principle and those for detailed planning permission relate to the following:
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no requirement for plans and drawings other than a location plan
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no requirement for a design or design and access statement to be prepared
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a requirement to describe the location of the access points to the development from a road where this is not otherwise detailed in the application and accompanying documents.
It is for the applicant to decide what level of detail they wish to provide. but it is open to the planning authority to require additional information using regulation 24 (Further Information) where necessary to determine the application.
While planning permission in principle is to establish the acceptability of a proposal in principle without having to develop the detailed proposals, applicants should discuss with planning authorities any additional information that is likely to be required. This may relate to matters such as design or access, traffic assessment or the requirements of other legislation, such as the EIA Regulations.
Further details of what you need to submit can be found in the Plans, drawings and additional documents (PDF, 32KB)| download.