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What are permitted development volume limits?

To qualify as permitted development some household building work projects – notably extending a house – must not exceed limits to the volume being added.  

In England, the volume allowance mostly applies to loft conversions. You can read more on the Planning Portal. 

Use the volume calculator to find out the volume of several loft conversion and extension types.

Common Questions

Do i pay for a planning or building control application if i am registered as disabled?

If your proposal for planning permission or building regulations approval is solely for extensions or alterations to a disabled person’s house to improve access, safety or comfort then you are exempt from paying a planning or building control fee. Additionally, if you are providing means of access for disabled persons to public buildings you are exempt from any fee.

Note that for building regulations approval, you will only be exempt when applying to a local authority building control body.

Do I need permission to run a taxi business from my home?

Running a taxi business from home will require planning permission as it constitutes a change of use of the property. The business may cause increased traffic or visitors, staff being in the property and external advertising, all of which would have an impact on the surrounding area.

You should contact your local planning authority or the Planning Guidance Service for more advice.

What is the ‘principal elevation’?

The principal elevation is the most visible or prominent side of a structure, typically facing a street or public area. While often considered the 'front' of the building, it may not always contain the main entrance. There can only be one principal elevation of a house.

Do I need planning permission to add a children’s climbing frame in my front or back garden?

Climbing frames are classed as ‘outbuildings’ meaning they are classed as permitted development, not requiring an application provided they meet the limits set out in legislation. One of these limits is that they cannot be in front of the house.

The key restrictions for a climbing frame will be the height; how close it can be to the properties boundaries and where it can be located.

A full list of limits and conditions can be found on our outbuildings common projects.

If the climbing frame exceeds any of the limits set out in legislation an application for planning permission is required.

What permissions do I need to install a hot tub in my garden?

You typically will not need planning permission to install a hot tub in your garden, as it is classed as an outbuilding and within the permitted development rights in terms of size and portability. However, you may need planning permission if you live in a listed building or conservation area, you should check first with your local authority.

The hot tub will need to adhere to the building regulations in terms of safe and adequate electrical installation by a registered competent person. Find out more about using a registered competent person.

Also, if the hot tub is placed within a building such as a large shed-style structure, there will be separate planning and building control limitations on that structure.

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