What is an ‘enclosed’ or ‘substantially enclosed’ premises?

Enclosed

Premises will be considered to be enclosed if they have a ceiling or roof and, except for doors, windows or passageways, are wholly enclosed, whether on a permanent or temporary basis. Tents, marquees or similar will also be classified as enclosed premises if they fall within this definition.

Substantially Enclosed

Premises are substantially enclosed if they have a ceiling or roof, but there are permanent openings in the walls which are less than half of the total areas of walls, including other structures which serve the purpose of walls and constitute the perimeter of premises. This is known as the 50% rule.

When determining the area of an opening, no account can be taken of openings in which doors, windows or other fittings that can be open or shut.

A roof includes any fixed or movable structures, such as canvas awnings.