To start a residential project you may need planning permission or have permitted developments rights, either way; you almost always need building control. You are better off understanding both;
Parliament has given the main responsibility for planning to local planning authorities (usually, this is the planning department of your local council).
It is realised that a form of permission is required for building work or alterations of properties. However, it may not always be clear how the Planning and Building Regulations approval regimes differ.
Difference between Planning Permission and Building Regulations:
in simple terms, is like asking if you can do a particular piece of building work. It will be granted (possibly subject to certain conditions) or refused.
Planning seeks to guide the way our towns, cities and countryside develop. This includes the use of land & buildings, the appearance of buildings, landscaping considerations, highway access and the impact that the development will have on the general environment.
It is the standard for the design and construction of buildings to ensure the safety and health for people in or about those buildings. They also include requirements to ensure that fuel and power are conserved, and facilities are provided for people, including those with disabilities, to access and move around inside buildings.
For many types of building work, separate permission under both regimes (different processes) will be required. For other building work, such as internal alterations, Buildings Regulations approval will probably be needed, but Planning permission may not be. You may also have responsibilities under the construction health and safety regulations.