Permitted development is the value nobody prices in — until the conservation area, the Article 4 direction or the listing quietly deletes it. One postcode: we pull the designations from the public registers, work out which rights survive for that nation (England, Wales and Scotland run different rules — Scotland even numbers them differently), and show every play with its real limits. Extensions, lofts, outbuildings — and the conversion rights investors actually hunt: commercial→resi and the barn plays.
A screening read of public designation data and the national rules — not a planning decision, not legal advice. Rights can be removed by Article 4 directions, by conditions on the original planning permission, or because the house was built under PD itself. "Original house" means as first built — previous extensions already count. The only definitive answer is a Lawful Development Certificate from the council. Sources: MHCLG Technical Guidance Sep 2019 (England) · Welsh Government Technical Guidance Apr 2014 (Wales) · Scottish Government Circulars 1/2024 & 2/2024 (Scotland).