Article 4 Direction
A planning restriction that removes permitted development rights in an area, most commonly requiring planning permission to convert a family home into a small HMO.
Normally, converting a dwellinghouse (planning class C3) into a small HMO of three to six unrelated sharers (class C4) is permitted development: no planning application needed. An Article 4 Direction removes that right in a defined area, so the same conversion needs full planning permission.
Why councils use them
Article 4 Directions are typically used in areas with high HMO concentration, such as student neighbourhoods, to control further conversions. Applications in these areas often face concentration caps, for example refusing permission where more than a set percentage of properties within a radius are already HMOs.
The trap for buyers
Article 4 is a planning restriction and completely separate from HMO licensing. A property can need both permissions, and holding one does not satisfy the other. The expensive mistake is buying a C3 house in an Article 4 area intending to run it as an HMO, then discovering permission is unlikely to be granted.
Before exchanging on any HMO deal, check the council's planning policy pages for Article 4 coverage, and verify whether an existing HMO has established use rights or a certificate of lawfulness.