You can perform certain types of work without needing to apply for planning permission. These are called "permitted development rights".
They derive from a general planning permission granted not by the local authority but by Parliament. Bear in mind that the permitted development rights which apply to many common projects for houses do not apply to flats, maisonettes or other buildings. Similarly, commercial properties have different permitted development rights to dwellings.
In some areas of the country, known generally as 'designated areas', permitted development rights are more restricted. For example, if you live in:
You will need to apply for planning permission for certain types of work which do not need an application in other areas. There are also different requirements if the property is a listed building.
Your Plans UK can produce detailed design drawings, structural calculations, structural design and specifications for your permitted development project.
Drawings are required for permitted development, to enable the Local Authority to assess the designs and monitor the works and for your chosen builder to understand the project and quote accurately.