Building Control guidance - exempt buildings

Exempt buildings

The table below describes some of the most frequent types of exempt buildings.

Some works may however require planning permission.

Type of building or building work Additional conditions which must be met
Detached buildings not normally used by people e.g. buildings containing fixed plant or machinery intermittently used by people only to maintain or inspect that plant or machinery. Subject to minimum distances from other buildings, or their boundaries, where people normally go.
Buildings used for agricultural purposes. Must not be used for retailing, packing or exhibiting. No part of building to be used as a dwelling. Subject to distance restrictions from any building containing sleeping accommodation, and provision of fire exit in some circumstances.
Ancillary buildings such as:
1. a site sales office
2. construction site office used during construction work
Must not contain sleeping accommodation.
Greenhouses* Must not be used for retailing, packing or exhibiting.
Temporary buildings, which will not remain on site. No part of building to be used as a dwelling. Subject to distance restrictions from any building containing sleeping accommodation and provision of fire exit in some circumstances.
Small detached buildings comprising either: **
1. a single storey building of not more than 30m² floor area; or Must not contain sleeping accommodation; and must either be at least 1m from the boundary of the site or be constructed substantially of non-combustible material
2. a building which does not have a floor area larger than 15m² Must not contain sleeping accommodation
- Extensions to buildings at ground level comprising**
- Thermally separated conservatory or porch, covered yard or covered way; or
Carport open on at least two sides
The extensions must be at ground level only and no larger than 30m² in floor area. Conservatories or porches, which are wholly or partly glazed, must meet the requirements regarding their glazing (i.e. Part 'N' of Schedule 1 of the Building Regulations)

Compliance with Part P Electrical Installations and Part G Water Supply & Systems, and Part L Conservation of Fuel and Power

* The building needs to comply were fixed electrical equipment, or a hot or cold water supply is provided shared with or located inside a dwelling.

** The building needs to comply where fixed electrical equipment is provided supplied from a dwelling, or where the building receives hot or cold water from a source shared with any building that is not an exempt building.

The building also needs to comply if the heating system of the dwelling is extended into the conservatory.

Exempt buildings

The table is only a guide to some of the more general types of buildings/building work, which may be exempt from control under the Building Regulations. It does not contain all the detail or conditions, which may need to be met.