Permitted Development Rights Explained: What You Can Build Without Planning Permission

Permitted Development (PD) rights are a set of national planning rules that let homeowners in England make certain changes to their property without submitting a full planning application. They exist so councils aren't processing applications for every small, low-impact home improvement.

What's typically covered by Permitted Development

• Single-storey rear extensions up to set size limits (see our rear extension planning guide for exact figures)
• Most loft conversions — Velux, dormer, and hip-to-gable, up to a set additional roof volume (40 cubic metres for terraced houses, 50 cubic metres for detached and semi-detached)
• Some side extensions and outbuildings, subject to height and boundary rules
• Certain porches, up to 3 square metres

What's usually NOT covered

• Anything on a flat or maisonette — PD rights for extensions generally apply to houses only
• Mansard loft conversions, which typically require full planning permission due to the significant roof shape change
• Extensions or alterations that would face a road at the front of the property
• Work on listed buildings, which always requires listed building consent regardless of PD rights

The exception that catches people out: Article 4 Directions

Some councils apply an "Article 4 Direction" to specific streets or conservation areas, which removes some or all Permitted Development rights for properties in that zone — usually to protect the character of an area. This means a project that would normally be PD-compliant might actually need a full application if your property falls within one of these zones. This is exactly the kind of thing that's easy to miss doing your own research online, and exactly what we check as standard at every site visit.

PD rights aren't a free pass on quality

Even when planning permission isn't required, building regulations always apply — covering structural safety, fire safety, insulation, and drainage. A project can be fully Permitted Development compliant and still fail building control if it's not built properly. We handle building control sign-off on every project regardless of whether planning permission was needed.

The Lawful Development Certificate — worth getting even when you don't need one

Even if your project qualifies under PD rights, you can apply for a Lawful Development Certificate from your council — a formal confirmation that the work was lawful. This isn't required, but it's genuinely useful if you sell the property later, since a buyer's solicitor may ask for evidence that an extension or loft conversion didn't need (and didn't skip) planning permission.

The honest bottom line

PD rules are genuinely useful, but they're also genuinely easy to get wrong — volume calculations, Article 4 zones, and previous extensions eating into your allowance all add complexity. We check all of this for free before you commit to a project, and handle any required applications as part of the build.

Book a free site visit and we'll tell you plainly whether your project needs planning permission before you spend anything on drawings.