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Have your permitted development rights been removed?
An Article 4 direction withdraws permitted development rights, so work that would normally need no application — a rear extension, new windows, a loft conversion, letting to sharers — needs full planning permission here.
8,005 article 4 directions on record across England and Wales, covering 35.8% of postcode districts.
Where this comes from, and what it cannot tell you
planning.data.gov.uk, published by the Ministry of Housing, Communities and Local Government under the Open Government Licence. Areas are matched by testing whether your postcode falls inside the published boundary — not by proximity to its centre — against all 1,573,900 live postcodes in England and Wales.
Some designations are too small to contain a postcode centroid at all; those are placed against the nearest postcode and marked nearby rather than presented as covering you. This is a signpost, not a legal search. Confirm with the local planning authority before doing anything that depends on it.