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Adding an annexe to your home

Adding an annex is a good way to extend your property, particularly if you would like a relative to live with you while maintaining your separate space.

This can be a straightforward process and can be less disruptive and costly than moving house. Buildings such as garages are commonly converted to provide semi-independent accommodation for members of the same family, particularly older relatives who may need additional care and support.

What is an annexe?

  • It is smaller than the main house and is not designed to be sold or let separately, for example a converted garage or outbuilding
  • It shares the same access, parking and amenity space (such as a sitting out or clothes drying area) as the main house

Council Tax and annexes

An annexe must appear on the council tax valuation list if it is self-contained with its own living area, cooking, washing facilities and a toilet.

The following Council Tax exemptions would apply for an annex:

  • A relative who is aged 65 or over or dependant (for example a disabled relative) living in an annexe would be exempt from paying Council Tax
  • A close relative under the age of 65 living in the annexe could get a 50% council tax discount
  • If the owner is using the annexe as part of their home then they may be able to  claim a 50% discount
  • If the annexe is unoccupied and unable to be let or sold separately from the main property then you may be exempt from council tax

How to get started

Guidance on garage conversions can be found at the planning portal: 

Information on planning you my need for changes to your property can be found on the council website. If you would like advice from the council before putting in a planning application you can complete the online pre-planning advice form or download it as a PDF. You will be charged £15 and can pay at the same time as completing the online form: