Permitted Development Explained

Where the rights come from

They are set out in national legislation that grants planning permission for classes of development on houses, so the council does not have to consider each one individually. Different classes cover extensions, roof alterations, outbuildings, porches, hard surfaces and other works, each with its own conditions.

Because it is national, the same rules apply everywhere, but the exceptions are local, which is why two apparently identical houses in different areas can have different options.

The classes homeowners meet most

Most domestic projects fall into a small number of these classes.

Extensions and alterations to a house, covering rear and side extensions · Roof enlargements, which is where loft dormers sit · Other roof alterations, covering rooflights close to the roof plane · Porches, within small size limits · Outbuildings and garden rooms, incidental to the enjoyment of the house · Hard surfaces, subject to drainage requirements

Conditions and limits

Every class carries conditions on size, height, position and materials, plus rules about how much of the original garden may be built on. Original means as the house stood at a fixed historical date or when first built, not as you bought it, so previous owners' extensions count against your allowance.

That last point catches people regularly. A house that has already been extended may have little or no allowance left, whatever the plot looks like.

How rights get removed

Permitted development rights are not permanent or universal. They can be removed by an Article 4 direction covering an area, by a planning condition on an individual property, or by the nature of the building itself.

Flats never had them. Listed buildings need separate consent regardless. Conservation areas keep some rights but with tighter limits, particularly for side extensions, cladding and roof work.

Prior approval, a middle route

Some permitted development is subject to prior approval, where the principle is accepted but specific impacts are checked first. The larger home extension route is the common domestic example, involving neighbour notification before work can start.

It sits between doing nothing and making a full application, and it is worth knowing about because it can unlock a bigger extension without the full process.

Proving it afterwards

A lawful development certificate is the council confirming in writing that what you built, or propose to build, did not need permission. It is optional and it is not planning permission.

It is also the single most useful piece of paper you can hold at the point of sale, because it settles in seconds a question that can otherwise delay a conveyance for weeks.

Frequently asked questions

Does permitted development mean I can build whatever I like?

No. It grants permission for specified works within strict conditions. Exceed any one of them and a full planning application is required for the whole scheme.

Do previous extensions count against my allowance?

Yes. Allowances are measured against the original house, so work carried out by previous owners reduces what remains available to you.

Do I still need building regulations approval?

Yes. Permitted development concerns planning only. Building regulations apply separately to almost all structural and habitable work.

How do I know if an Article 4 direction applies?

Councils publish them, usually on their planning pages and on their online mapping. If in doubt, ask the local planning authority directly about your address.