A non-fatal accident at work is an accident which a victim survives and may result in one or more days of absence from work. A serious non-fatal accident at work is an accident at work resulting in more than three days' of absence from work.
Health & Safety Executive
Section F of the UK Standard Industrial Classification (SIC) 2007, specifically SIC divisions 41, 42 and 43, which are defined as:
41: Construction of buildings
42: Civil engineering
43: Specialised construction activities
UK