Article 4 directions on houses in multiple occupation
Converting a family house to a small shared house is permitted development until a council removes the right. How directions are made, how to check one, and what a C4 application must show.
An Article 4 direction on houses in multiple occupation removes the permitted change from Class C3 to Class C4, so converting a family house into a small shared house needs planning permission. Without a direction that change is permitted development anywhere in England. With one, it is a full application, judged against local policy on concentration, amenity and parking, and refusals are common in the areas where directions exist.
Directions are local instruments. They cover specific streets, wards or whole authority areas, and two towns twenty miles apart can take opposite positions.
What the classes actually cover
Class C3 is a dwellinghouse occupied by a single household. Class C4 is a house in multiple occupation for between three and six residents who are not a single household and who share basic amenities such as a kitchen or bathroom.
Above six residents the use falls outside both classes and is sui generis, which means planning permission is always required for it regardless of any direction. That threshold catches investors who assume a seven bedroom property behaves like a six bedroom one.
The permitted change between C3 and C4 sits in Part 3 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015, and it operates in both directions. A direction that removes the C3 to C4 change usually leaves the reverse change untouched, so converting an HMO back to a family house remains permitted development.
Establishing the existing lawful use is the first task on any purchase. A property marketed as an HMO may never have had a lawful change of use, and the risk transfers with the title.
Why councils make these directions
The policy concern is concentration. Where a high proportion of properties in a street or ward become shared houses, councils point to effects on the balance of the community, on demand for on-street parking, on waste and on the condition of the housing stock.
University towns and cities with large hospital or seasonal workforces are where directions cluster, and many have been in force for more than a decade.
National policy expects directions to be limited to situations where they are necessary to avoid wholly unacceptable adverse impacts and to apply to the smallest geographical area that will achieve the purpose. Whole-authority directions exist and have been made, but they attract more scrutiny at the confirmation stage. The current Framework was re-issued on 17 August 2026 with policy-coded chapters, so quote the code from the published edition rather than a paragraph number from an earlier one.
How a direction is made and confirmed
The council makes the direction, publicises it, invites representations and then decides whether to confirm it. A direction has no effect until it is confirmed, unless it was made with immediate effect, which is unusual for HMO directions.
Most councils give at least twelve months' notice before a direction takes effect. That is a deliberate choice rather than a courtesy. Withdrawing permitted development rights can create a compensation liability under section 108 of the Town and Country Planning Act 1990, and giving the notice period removes it.
The practical consequence for an investor is a window. Where a direction has been made but does not take effect for a year, changes of use completed and evidenced before that date remain lawful. Completed means the use has actually begun, not that contracts were exchanged.
Checking whether a property is inside one
Four checks, and none of them takes long.
- Search the council's planning policy pages for its Article 4 directions register, and read the direction document rather than a summary of it.
- Confirm the geographic extent against the plan attached to the direction, since boundaries often follow ward or street lines that are not obvious on the ground.
- Check the national planning data service, which publishes an article 4 direction dataset drawn from local authority submissions, as a cross-check.
- Check the council's HMO licensing register for the address and its neighbours, which also tells you about local concentration.
Where the position is unclear, or where an existing HMO use is claimed but undocumented, apply for a certificate of lawfulness. A certificate for an existing use under section 191 of the Town and Country Planning Act 1990 is the only formal way to establish that an existing use is lawful, and a lender or a buyer's solicitor will want one.
What a C4 application needs to show
Applications in direction areas are decided against local policy, and most councils that have made a direction have also adopted a concentration policy.
Those policies typically set a threshold expressed as a percentage of residential properties within a stated radius already in HMO use, sometimes with a rule about adjoining properties. The evidence base is the council's own data from licensing and council tax records, and applicants should ask for it rather than estimating.
Beyond concentration, expect scrutiny of room sizes against licensing standards, the ratio of bathrooms and kitchen facilities to occupants, refuse and recycling storage with a realistic number of bins and a route to the collection point, cycle storage, and sound insulation between rooms.
Parking is the recurring argument. Where the council applies a parking stress standard, a survey carried out to a recognised methodology gives you evidence rather than assertion, and a Parking Survey run over the correct nights is the document that settles it. Surveys taken in university vacations will be challenged.
Set the case out properly in a Planning Statement that addresses the concentration policy directly with the council's own figures, and use the Design and Access Statement for the internal layout, amenity provision and storage arrangements.
Licensing is a separate system
Planning permission and HMO licensing answer different questions, and holding one gives you nothing under the other.
Mandatory licensing under the Housing Act 2004 applies to houses in multiple occupation occupied by five or more people forming two or more households. Councils may also run additional licensing schemes covering smaller HMOs and selective licensing covering other rented housing in designated areas.
Licensing looks at room sizes, amenity standards, fire safety, management and the fitness of the licence holder. Planning looks at the use of the land and its effects. A property can be licensed and still be an unlawful use in planning terms, and that is exactly the position many purchasers discover late.
Check both registers before exchanging. Then check whether an additional licensing scheme is due for renewal or extension, because designations run for fixed periods.
Buying in an area covered by a direction
Price the planning risk rather than assuming it away.
Establish the lawful use with documentary evidence or a certificate. Read the concentration policy and calculate where the property sits against the threshold using the council's data. Look at recent decisions on comparable applications in the same ward, which are on the public register. Consider whether the property would still work as a family house or a single let if consent is refused.
And treat any advice that a direction can be ignored because enforcement is rare as what it is. Enforcement in these areas tends to be complaint-driven, and a neighbour objection after occupation is the commonest trigger.
Browse the PlanScope report types to see which documents a change of use application is likely to need.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
What is the difference between Class C3 and Class C4?
Class C3 is a dwellinghouse occupied by a single household. Class C4 is a house in multiple occupation for three to six residents who are not a single household and who share basic amenities. Above six residents the use is sui generis, so planning permission is always required regardless of any Article 4 direction.
Can I still convert an HMO back to a family house?
Usually yes. The permitted change between C3 and C4 operates in both directions, and a direction removing the C3 to C4 change normally leaves the reverse untouched. Read the direction itself to confirm which classes it withdraws, because the wording is what governs and summaries are not always accurate.
Is a planning fee payable in a direction area?
Not where permission is required solely because the Article 4 direction removed the permitted development right. The exemption covers the application fee and not professional costs. If the proposal would have needed permission anyway, for example because it creates a large HMO, the normal fee applies.
Does an HMO licence mean the use is lawful for planning?
No. Licensing under the Housing Act 2004 looks at room sizes, amenity standards, fire safety and management. Planning looks at the use of the land and its effects. A property can hold a licence while remaining an unlawful use in planning terms, which purchasers frequently discover after completion.
How do I prove an existing HMO use is lawful?
Apply for a certificate of lawfulness for an existing use under section 191 of the Town and Country Planning Act 1990. It is decided on the law and the evidence rather than on planning merits, and it produces a document a lender or a buyer's solicitor will accept. Assemble tenancy agreements, council tax records and utility evidence.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.