Article 4 Direction
Definition
An Article 4 direction is a UK planning tool that removes permitted development rights in a defined area — most relevantly, the right to convert a family home into a small HMO without planning permission. Checking for Article 4 coverage is a first-step diligence item for anyone converting property to shared living in England.
Benchmark
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Two of the four UK cities in our entry cost index — Birmingham and Bristol — have removed permitted development for HMO conversion across the entire city. An acquisition model that assumes permitted development is wrong in half of them.
In England, changing a family dwelling in use class C3 into a small HMO in use class C4 — three to six unrelated sharers — is permitted development under the General Permitted Development Order. An Article 4 direction removes that right for a defined area, so the same change then requires a full planning application.
Coverage has widened considerably. Birmingham has operated a citywide direction since 8 June 2020, and Bristol since September 2021, so in both cities every house-to-HMO conversion needs permission with no exempt wards. Manchester applies directions across the student belt, and at least 22 London boroughs have directions, some borough-wide and others ward-specific.
Where a direction applies, the application is not a formality. Manchester's Policy H11 allows refusal where HMO concentration within 100 metres already exceeds local thresholds — meaning a fully compliant building can be refused because of its neighbours, and the wards with the strongest rental demand are the ones most likely to already sit at the threshold.
Above six sharers the question changes anyway: seven or more takes a property sui generis, which always requires planning permission regardless of any direction.
The common mistake
Checking the postcode instead of the address
Article 4 coverage is address-specific. A direction can cover an entire local authority or only certain wards, and the boundary does not follow anything intuitive. The sequence we see repeatedly is an operator running the numbers on a conversion, exchanging, and then discovering the council removed permitted development rights years ago — turning a straightforward conversion into a full planning application in a borough whose policy may actively resist HMO concentration.
Frequently asked
How do I check if a property is in an Article 4 area?+
Check the local planning authority's own published directions for the specific address rather than the postcode district, and do it before exchange. Councils publish the designations and their boundaries; an aggregator summary is not a substitute where the boundary is ward-level.
Which UK cities have citywide Article 4 directions for HMOs?+
Birmingham since 8 June 2020 and Bristol since September 2021 both operate citywide directions. Manchester applies directions across the student-heavy wards, and at least 22 London boroughs have directions of varying coverage.
Does an Article 4 direction mean I cannot convert at all?+
No. It means the conversion needs planning permission rather than proceeding automatically. Whether permission is granted depends on local policy — which in some authorities includes an HMO concentration test that can produce a refusal on grounds unrelated to your building.
Compliance guides, city by city
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Coliving vs HMO: what actually changes
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UK Coliving Entry Cost Index
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