Full Plans applications
A Full Plans application needs to contain plans and other information showing all construction details, and needs to be made well in advance of when work is to start on site. It's usually used for large projects.
Building Notice applications
A Building Notice application doesn't require detailed plans to be submitted. It's generally quicker than the full plans application and is designed to enable some types of building work to get under way quickly. However, it tends to be best suited to small projects.