In addition to planning permission, it is likely that you’ll also need building regulation approval (also known as building control).
Building regulations ensure buildings are designed and constructed in line with set standards to ensure buildings are fit for purpose and safe to use.
These standards include matters such as fire safety, energy efficiency, sustainable development, and access.
You should talk to an officer in your local authority’s building control services department at an early stage, as this will help ensure your proposed development meets the relevant standards.