The drawings and information a building control body needs, prepared to be approved rather than queried.
The technical drawings and supporting information for a Building Regulations submission: construction build-ups, thermal performance, fire strategy and means of escape, access, ventilation and drainage, coordinated with the structural and services information.
Planning consent says a building may exist. This is the work that establishes it may be built.
Because the two regimes ask different questions and are satisfied by different drawings. A planning drawing shows what a building looks like and how it sits; a Building Regulations drawing shows how it performs and how it goes together.
Treating the second as a formality after the first is how projects arrive on site with information nobody can build from.
Care and supported living schemes carry requirements that a standard residential submission does not, and they interact: means of escape, separation, staff provision and the registration standards all bear on the same rooms.
Those are resolved together, because solving them one at a time produces a building that satisfies each and none.
Describe what you have in mind and we will say plainly whether this is the right service for it, and what it would involve.