To make life a little simpler, we have complied a list of frequently asked questions when it comes
down to building a Granny Annexe within your garden.
1. If I want sleeping accommodation in my Granny Annexe, do I require planning permission?
Essentially once sleeping accommodation comes into play, your building no longer falls into the
category of Class E permitted development. So yes, planning permission is definitely required.
It can be a little confusing as cinemas, home gyms or home offices do not require planning
permission as these are considered incidental ( a requirement of permitted development).
An annexe is ancillary. We have written a blog ‘Incidental Vs Ancillary’ which you can find here, to
find out further information on this (link blog).
2. How much are application fees?
When submitting an application to your Local Planning Authority, the application fee can vary
depending on the what you’re applying for. NAPC often will put forward an annexe or mobile home application, so the fees slightly differ. It is worth noting that the responsibility goes to the applicant to pay their LPA direct. Including the planning portal surcharge, the annexe fee will be £238.20 and for a mobile home, £135.20.
3. How long does the application process take?
From the validation period, the process will take around 8-10 weeks, however in some cases it may
be longer. This may be due to the case load of your LPA. These are the steps in order for a decision to be made:
- Pre – Application
- Application and Submission
- Consultation and Publicity
- Site Visit
- Consideration of Application
- Decision Reached
Within the first three weeks , your LPA will write to your parish council, neighbours, highways, water
agencies and ward councilors and notify them or your proposed build.
Once this has been published, they then have 21 days to raise any concerns or disagreements with
A case officer will be appointed from week four and will undergo a site visit, if required, before a
decision is made
4. What can I put forward to my LPA to ensure my annexe application has the best chance of approval?
With 15 years of experience and a 99% success rate, NAPC have some recommendations for your
- Make sure the design and materials used appear subordinate to the main dwelling, and
reflect the local character and the host dwelling.
- Annexe is close to the main dwelling
- Basic level of facilities (reiterates ancillary building)
- The annexe is not too big
- The location of the annexe has minimal effect of neighbours privacy and amenity
5. If my building is within 2m of a boundary – how high can it be?
Short and sweet – 2.5 metres!
If you need assistance when it comes down to planning permission, please do not hesitate to contact