You will need this permit if you intend to conduct building work. The permit must be obtained prior to work commencing.
You must also obtain a Certificate of Design Compliance (CDC) if you intend to construct a building or incidental structure. Your CDC must be in an approved form, and you must include a statement from your building surveyor that your building will comply with the applicable standard if your building is completed following your current plans and specifications.
The Building Regulations have more information about other details your CDC must include and what your surveyor must do when signing the building certificate.