Granny Annexe Planning: Obtaining Permission to Build

Granny Annexe Planning: Obtaining Permission to Build
Diane Cossie
Granny Annexe Planning Permission

Granny Annexe Planning Permission Made Simple

Obtaining planning permission to build your new granny annexe will certainly put you through a whole range of emotions as you decide whether building an annexe in the back garden is the right thing for you and your family.

We know that every situation is unique and we’ll endeavour to make the journey as smooth and stress free as possible.


Working with your Local Planning Authority

One thing that crops up very early in the decision making process is the daunting prospect of obtaining permission to build a granny annexe in your back garden from your Local Planning Authority (LPA).

Contrary to popular belief, a granny annexe with someone living in it on a day-to-day basis will always need either planning permission or a Certificate of Lawfulness from your LPA.

Some temporary-style buildings such as leisure buildings that are not going to be lived in may not need planning permission.

This is not something you should attempt yourself. It is only something that should be handled by professionals who specialise in obtaining residential planning permission in the UK.

With that in mind, and with a success rate of over 90%, it’s a service we offer to all our iHUS customers because we want your application to be a successful one.

The easiest (and best) way to find out what your chances are of obtaining planning permission for your granny annexe is to book a free on-site consultation service with one of our experts.

They have years of first hand experience of what your Local Planning Authority is likely to approve of and what they are likely to reject.

For example, you may want a pitched roof annexe, but we might advise during our free on site consultation that because the property is overlooked by several neighbours we would recommend a flat roof annexe as your best option.

This kind of precise knowledge and advice is invaluable and can potentially save you hours of wasted time not to mention thousands of pounds in trying to get planning permission in the wrong way. 

Most garden annexes like those in our HUSCore range are designed for back garden annexe use. (They are also extremely budget-friendly, starting at just under £60,000).


Granny Annexes and the Caravan Act

You might also have heard a lot about the Caravan Act as being a ‘silver bullet’ (it can still be refused), but it will still require a Certificate of Lawfulness from your Local Planning Authority.

We also offer this service as in some circumstances and this may well be your best route to obtaining permission and you have fuller flexibility on the design and size you would like.

When you obtain planning permission to build an annexe in the back garden you are working with your Local Planning Authority to develop the land. They will have input on how it looks, what materials and finishes are being used on the outside, and which style and size they will accept.

With the Caravan Act you are applying to site a temporary building on the land not develop it.

All our granny annexes are classed as mobile homes which attract zero rated vat saving you thousands of pounds when compared to a home extension for example.

It’s simple to get the best advice about your granny annexe project and find out the best way to go about obtaining the right type of planning permission for your granny annexe at the same time by requesting one of our informal on site consultations as your very first step to success.

Our annexe experts will discuss with you the best route for obtaining permission for your granny annexe and advise you on the best location and style for your particular garden.

It’s simple, free, effective and gives you all the right information to help you make the best decision for your family now and for many years to come.


  1. Our free on-site consultation service is the easiest and quickest way to get the right information about planning permission and your granny annexe project.
  2. Obtaining permission from your Local Planning Authority to be able to build an annexe in your back garden is not something that should be tackled by anyone other than an expert in obtaining residential planning permission. (iHUS do this for you as part of our turn-key service)
  3. Our annexe experts will advise you on the best style, position and size for your granny annexe during the on site consultation. It’s worth doing things the right way at the beginning for peace of mind and less stress later in the process.

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