ExtensionPlannerCodurance

Know what you can build at your address.

Enter your postcode. We check planning constraints and permitted development rights in plain English, in a few seconds.

How it works

  1. 1.Enter your postcode

    We resolve it to your Local Planning Authority and a precise location.

  2. 2.We check the constraints

    Conservation areas, listed buildings, Article 4 directions, AONBs and more, against national planning data.

  3. 3.Get a plain-English verdict

    A clear read on what is likely buildable, with the evidence and the caveats.

< 5sAverage check
OGLOpen data
FreeNo sign-up

e.g. SW1A 1AA. Try DN1 1UB for a populated demo (Doncaster).

Free. No sign up. No data stored.

Powered by planning.data.gov.uk. Application coverage varies by council.

What you’ll see

  • Your Local Planning Authority
  • Conservation areas and listed buildings
  • Article 4 directions and AONBs
  • Nearby planning applications (1-mile radius)
  • A plain-English buildability verdict

Not a substitute for a planning consultant. For binding certainty, apply for a Lawful Development Certificate.