What Planning Rules Apply To A Granny Annexe/ Mobile Home?

A selection of our models can be classed as a ‘mobile home’. Built to our usual residential house standard for all year round enjoyment (not the flimsy, substandard BS3632 specification associated with holiday parks), these can be up to 20 x 6.8m and feature multiple bedrooms. The big advantage is that if the building is going in the grounds of your main house, you could add new living space without needing planning approval and increase the value and use of your property.

Below are rules that are applicable to mobile homes:

Private land (without an existing dwelling)

If you own a piece of land away from your current dwelling and wish to site a mobile cabin on it then you will need to apply for full planning permission with your local planning department.

Sites that have a building on already (such as a barn) often have more chance of getting permission but we have found that planning departments often like mobile cabins as they are not deemed permanent but in reality they will last for 100’s of years if maintained properly. Once you have permission for a mobile home for residential use then the council are normally happy with our product as it looks far better in the country than a metal box with a flat roof.

Private land (in the curtilage of an existing dwelling)

If you want to have a mobile home cabin within your garden (curtilage of your dwelling house) to be used an extra room in addition to the main house such as an extra bedroom or day room then you will not need planning permission unless you live in a conservation area. Some councils will require you to apply for a Certificate of Lawful Development so it is always worth checking with your local planning department.

Commercial venture

Mobile cabins are a great idea if you are thinking of creating a business of holiday lets. The cabins are of high quality and provide a wow factor that normal static caravans don’t.

You will need to apply for planning permission with your local council and will need to submit information on the economic value of the business both direct (benefits to your own business) as well as indirect (benefits to other parts of the local economy).


You can use a caravan for forestry purposes, such as storage of tools, shelter for workers or as a site office. Provided the caravan is not for residential use, it falls completely outside planning controls. The Caravan Sites Act 1968 says that the legal definition of a caravan includes mobile homes. Under this definition, there is no necessity for the caravan to have wheels, as long as it is under the size limit and can be delivered in no more than two sections. For this use however we prefer the Permitted development route as it allows us to construct the cabin on site.


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