Residential Annexes – Planning Guidance
The granny annexe must be sited within the area directly next to the house, and within the property curtilage, such as the driveway or garden. If you are looking to site a granny annexe anywhere other than in your garden, you will need to contact the local council for approval, which is also needed for conservation areas and new developments.
The structure should conform to the legal definition of a caravan, which all our annexes built for residential use to standard BS 3632 are.
It must not be sublet as a private residence or for business purposes, as it must be used for guest accommodation / house overflow, or by family members. It cannot be used as a sole residence and the original main property on the land must be accessible for use by the occupants of the unit, or they need to have some level of interaction with family members or householders in the main property.
So, granny annexes, family accommodation and occasional house use (up to 6.8m x 20m) will need no further referral, within the boundary terms as already stated.