Annexe (or Granny Annexes as they are often called) are often in detached outbuildings but can also be added as extensions to existing properties.
While an annexe or outbuilding can sometimes be undertaken through permitted development, in many cases it will require planning permission. A permitted development extension or outbuilding will be limited by the scale, materials and use.
For an annexe property, the use becomes critical and whether it is classed as an “incidental” or “ancillary” use (just another room in the house or self-contained).
The definitions and arguments surrounding “incidental” and “ancillary” are complex and obtaining professional advice before undertaking any work are vital.
At Plande, we are able to assist with your annexe or outbuilding projects and can guide you through the process, advising of the options and limitations as well as managing the application, or Lawful Development Certificate process.