Article 4 directions: how to check one before you buy

Scope: England. Wales operates its own planning regime; the permitted development rights and the direction-making power differ — see the divergence map. Verified against the legislation on 14 August 2026.

Converting a family house to a small shared HMO — three to six unrelated people — is normally permitted development. No planning application, no fee, no decision to wait for.

An Article 4 direction switches that off. Inside one, the same conversion needs full planning permission, which the council can refuse, and frequently does where it considers an area already saturated.

This is the single most expensive thing to discover after completion.

What it is, precisely

Permitted development rights come from the General Permitted Development Order. Article 4 of that Order lets a local planning authority withdraw a specified right in a specified area. For HMOs the right withdrawn is the one allowing a change of use from Class C3 (dwellinghouse) to Class C4 (small HMO).

Two things follow that people get wrong:

• It is geographic, not borough-wide by default. Many directions cover a few wards, or a ring around a university. A council can have one and your street can be outside it.
• It has a start date. Directions are made with notice, and a conversion completed lawfully before the direction took effect is not retrospectively unlawful.

How to check an address

There is no national register of Article 4 directions. The check is per council, and it is manual:

1. Identify the planning authority for the address. It is not always the same body you would think of as "the council" in two-tier areas.
2. Search their planning policy pages for "Article 4" and for "HMO". Most publish a direction document and a map.
3. Read the map against the actual address, not the town. Direction boundaries follow ward or street lines and a property one road over can be outside.
4. Check the date the direction took effect, and whether it has been extended or replaced.
5. If anything is unclear, ask the authority in writing. A written answer before exchange is worth more than an assumption after it.

Your conveyancer's local search may or may not surface this clearly. Asking the question explicitly is more reliable than hoping it appears.

Planning and licensing are different questions

This is the confusion that costs money. A property can need:

• Planning permission — because an Article 4 direction removed the permitted development right; and
• A licence — because of mandatory HMO thresholds or a council's additional licensing designation.

Having one does not give you the other, and the two often have different boundaries in the same borough. Planning versus licensing covers the distinction; the additional licensing register lists the schemes we can evidence.

What happens if you convert without permission inside a direction

The council can take planning enforcement action requiring the use to cease — which means returning the property to a single dwelling, with the income that implies. Enforcement is discretionary and time-limited, but a landlord relying on those limits is relying on not being noticed.

It is also independent of licensing: complying with the licensing regime is no answer to a planning breach, and a licence is not permission.

Before you exchange

• Confirm the planning authority and check for a direction covering that address.
• Check whether a licence would be required, and what it costs — the fee table.
• Check schemes starting soon: a designation commencing after completion is a cost you have not budgeted for.
• Ask whether the property has an existing lawful HMO use, and what evidences it.

Run the free compliance check for the address to see which licensing regimes apply.