Non-domestic premises are:
all workplaces and commercial premises
all premises that the public has access to
the common areas of multi-occupied residential buildings
shared premises
In the case of shared premises, there is likely to be more than one responsible person. As such, the responsible persons will need to coordinate plans to ensure the safety of people on or around the premises.
For common or shared areas, the responsible person is the landlord, freeholder or managing agent.