Article 4 direction
An Article 4 direction is a planning measure that allows a local planning authority to withdraw permitted development rights across a defined area. For landlords it most often removes the right to change a dwellinghouse (use class C3) into a small house in multiple occupation (use class C4). The power sits in the Town and Country Planning (General Permitted Development) (England) Order 2015. Where a direction is in force, converting a home into a small HMO needs a full planning application.
What an Article 4 direction removes
Outside an Article 4 area, changing a single dwelling (C3) into a small HMO for three to six unrelated occupants (C4) is permitted development, so no planning application is required. An Article 4 direction switches that automatic right off for the area it covers. The change of use itself is unchanged, but the landlord must now apply for planning permission and show that the conversion meets local planning policy. A direction does not ban HMOs. It brings the change of use into the planning system so the council can control where shared housing is concentrated.
How to check whether a property is affected
Article 4 directions are made locally, so coverage varies street by street. Many councils apply them across whole boroughs or around universities and town centres where HMOs are concentrated. From working with self-managing landlords across the UK, we see this missed most often at the offer stage, when a property looks like a simple conversion but sits inside a direction the buyer never checked. Confirm the position with the relevant local planning authority before committing, and ask whether the area is under consultation as well as already designated.
Whether existing HMOs are caught
A direction does not affect an HMO that was already lawful when it came into force. If a property was in use as a small HMO before the direction took effect, that use can usually continue. A property used as an HMO for long enough may also be lawful regardless of the direction. Where the position is unclear, a landlord can apply to the council for a certificate of lawfulness to confirm the existing use. The risk arises when a landlord assumes permitted development still applies and converts without checking.
Large HMOs and sui generis
An Article 4 direction concerns the C3 to C4 change only. An HMO occupied by seven or more unrelated people falls outside C4 and is treated as sui generis, which requires planning permission in its own right whether or not a direction is in place. Planning permission is a separate step from licensing, and securing one does not remove the need for an HMO licence where the property requires it.
Why it matters for landlords
An Article 4 direction can decide whether an HMO strategy works in a given area. Planning permission is not guaranteed, and councils can refuse where they judge that the neighbourhood already has too high a concentration of shared housing. Landlords using August to track their portfolio compliance tell us the planning position is the part they most want recorded against a property, because it is easy to forget and expensive to get wrong. Keeping the planning consent, any certificate of lawfulness, and the licence together against each property avoids that gap.
Frequently asked questions
Do I need planning permission for an HMO in an Article 4 area?
Yes, if you are converting a dwelling into a small HMO. The direction removes the permitted development right, so a full planning application is required and must satisfy local policy.
How do I find out if a property is in an Article 4 area?
Ask the local planning authority or check its planning policy pages. Coverage is set locally and can apply to a whole borough or only to specific wards.
Does Article 4 affect an HMO that already exists?
No, not where the HMO use was already lawful when the direction came into force. A certificate of lawfulness can confirm an established use if there is any doubt.
What is the difference between C3 and C4 use class?
C3 is a dwellinghouse occupied as a single household. C4 is a small HMO shared by three to six unrelated occupants. The C3 to C4 change is what an Article 4 direction typically brings under planning control.
