Paragraph 2 F1

Any work to or in a non-residential building to which the public does not have access. Except–A non-residential building within which there is a domestic or residential building. Any work which increases the floor area of the building. Any demolition or alteration of the roof, external walls or elements of structure. Any work involving underpinning. Any work adversely affecting a separating wall. Any work involving a change in the method of wastewater discharge. Work, not being work of types 3 to 26 below, to a building having a storey, or creating a storey, at a height of more than 7.5 metres.