Residential annexes (or granny annexes) are developments that allow relatives to live with their family independently.
Planning permission is needed:
- to build an annex, not attached to the main house, within your property boundary
- for any new building to provide an annex associated with a flat
- when there are conditions attached to a previous planning approval preventing development
Planning permission is not needed:
- to convert a residential out building, within the property boundary, when there will be no kitchen or cooking facilities
Planning applications for residential annexes must comply with:
- policy DM43 of our sites and policies plan – part 1 development management
- policies H7, H8 and RD3 of our replacement local plan
- policies CS32, CS33, CS10 and CS11 of our Core Strategy
- our residential design guide standards
- our parking standards supplementary planning documents
We recommend you employ an accredited agent and use our pre-application advice service.
Statement of use
When sending us your application for an annex you must include a statement to show:
- who will use the annex
- the user’s relationship to the occupants of the main house
- how the use of the annex will meet our policies
You may need permission under building regulations legislation.
building control website
Detailed guidance for planning professionals