Yes, for Category 2 where there is a need to insulate inhabited areas below a balcony or terrace a step-up of up to 225mm would be reasonable. This does not apply to Category 3.
Category:
Part M - Access to and use of buildings
Yes, for Category 2 where there is a need to insulate inhabited areas below a balcony or terrace a step-up of up to 225mm would be reasonable. This does not apply to Category 3.