Ancillary use

[edit] What is an example of auxiliary use?

Ancillary use refers to a use of land or buildings that is directly related to, subservient to, and supports the primary use of the property. It is often considered an integral part of the main use and contributes to its functionality. Ancillary uses maybe accepted as part of an overall development without requiring separate planning permission, under certain criteria. For example, a shop with a storeroom, a hotel with a restaurant, or a house with a garage are common examples of ancillary uses.

Incidental use refers to minor, secondary or complementary uses that are concurrent with main use. For example a garden shed is generally incidental to the use of the garden of a dwelling house, it is normally a relatively temporary building and incidental to the enjoyment of the dwelling house. If the garden shed becomes larger, permanent, more significant, it becomes ancillary, thus more significant and may constitute as being permitted. If the use of the shed gives beyond the storage of equipment, such as a workshop or even a separate dwelling, and maybe move beyond ancillary and potentially considered as a separate use.

[edit] How is the the difference described in planning guidance?

The Permitted development rights for Householders Technical Guidance 2019 describes examples that would be considered as incidental use and where these may be considered a auxiliary use;

“Examples could include common buildings such as garden sheds, other storage buildings, garages, and garden decking as long as they can be properly be described as having a purpose incidental to the enjoyment of the house. A purpose incidental to a house would not, however, cover normal residential uses, such as separate self-contained accommodation or the use of an outbuilding for primary living accommodation such as a bedroom, bathroom, or kitchen”.

The Town and Country Planning (General Permitted Development) (England) Order 2015, Changes over time for: Cross Heading: Class E – buildings etc incidental to the enjoyment of a dwellinghouse describes this as such;

Class E – buildings etc incidental to the enjoyment of a dwellinghouse

Permitted development

E. The provision within the curtilage of the dwellinghouse of—

(a) any building or enclosure, swimming or other pool required for a purpose incidental to the enjoyment of the dwellinghouse as such, or the maintenance, improvement or other alteration of such a building or enclosure; or

(b) a container used for domestic heating purposes for the storage of oil or liquid petroleum gas.

It is important to note that the order in E.1 onwards goes on to describe many examples where cases are not permitted, even if considered as incidental, so further advice should always be sought.

Essentially, to a large extent whether something is ancillary or incidental can be a matter of interpretation and context, one which planning authorities may also take into consideration neighbours, the surrounding area, and specific policies or regulations. These interpretations can also change over time, depending on previous cases, locally and nationally, as such it is always worthwhile seeking advice on specific cases and how they might be viewed by local authorities before making assumptions.

[edit] Related articles on Designing Buildings

• Caravan Sites and Control of Development Act 1960.
• Changes to permitted development in 2023‎.
• Could microhousing tackle London's housing crisis?
• Detailed planning application.
• Granny annexe.
• Micro dwelling.
• Mobile home.
• National Planning Policy Framework.
• Outbuildings definition.
• Permitted development.
• Planning permission.
• Planning condition.
• Planning obligation.
• Sui generis use class in planning.
• Tiny house.
• The Town and Country Planning (General Permitted Development etc.) (England) (Amendment) Order 2023‎.