Article 4 directions: checking whether one covers your site
Article 4 coverage is the constraint most likely to be missed on an acquisition, and the one that most often turns a permitted development conversion into a contested application.
If your purchase price assumes a permitted development conversion, the Article 4 check is the piece of due diligence to do before you exchange, not after. A direction made under article 4 of the GPDO 2015 withdraws named permitted development classes inside a mapped area, and a withdrawn class turns a notification into a contested planning application with a real chance of refusal.
The check takes a morning. The mistake takes a year.
What to check, in what order
- Search the Article 4 direction and Article 4 direction area datasets on planning.data.gov.uk for the address, and note the classes recorded against any polygon that covers it.
- Open the council's own planning constraints map and run the same address. Look for a separate HMO or Class MA policy layer, because some authorities map those apart from their general Article 4 layer.
- Find the direction document and its schedule on the council's website. The schedule is the operative part, and it names the Parts and Classes withdrawn.
- Check the council's planning policy pages and committee minutes for directions recently consulted on or made but not yet published in either dataset.
- Write to the planning department with the address and ask which permitted development classes are withdrawn, whether the direction is immediate or non-immediate, and the date it took or takes effect.
- Search the council's planning register for the address and neighbouring properties, because a run of recent applications for something that ought to be permitted development is a strong signal that a direction exists.
Step six catches directions the mapping has missed. If six houses in the street have applied for single-storey rear extensions, somebody withdrew Class A.
What a conveyancing search will and will not tell you
Local authority enquiries report conservation area designation reliably. Article 4 coverage is patchier, because the answer depends on what the council has recorded in a form the search can pick up, and many directions made in the 1970s and 1980s exist only as paper documents in a policy file.
So treat the search as one input. Raise Article 4 as a specific additional enquiry, and get the planning department's own answer in writing alongside it. Keep both, dated. If a seller or an agent has told you the property is unrestricted, get that in writing too, because the difference between a permitted conversion and a refused application is usually tens of thousands of pounds.
The same discipline applies to other constraints that searches report inconsistently. Coalfield legacy is one, covered in mine entries, permits and coalfield planning conditions. Proximity to a notifiable installation is another, covered in hazardous substances consultation zones explained.
HMO directions and the C3 to C4 right
This is the direction that affects most residential investors.
Part 3 of Schedule 2 to the GPDO 2015 allows a change between class C3, a dwellinghouse, and class C4, a small house in multiple occupation occupied by between three and six unrelated residents sharing facilities. Councils in university towns and cities have withdrawn that right across whole wards, sometimes across the whole authority, to manage the concentration of shared housing.
Three things follow.
Inside a direction area, converting a family house to a small HMO needs planning permission, and the application is judged on amenity, refuse and bin storage, cycle parking, room sizes, and the proportion of shared housing already in the immediate area. Many authorities apply a threshold policy expressed as a percentage of properties within a radius, and once the threshold is exceeded refusal follows almost automatically.
Parking stress is the argument that decides borderline cases. A survey carried out to the recognised overnight methodology, avoiding school holidays, is the evidence that answers it, and a Parking Survey is the document that presents it.
And seven or more residents takes the property outside C4 altogether into a sui generis large HMO, which always needs planning permission whether or not a direction exists. Buyers sometimes discover that after letting the seventh room.
Licensing is a separate regime
A property can hold a valid HMO licence and be in breach of planning control at the same time. Licensing under the Housing Act 2004 regulates management, amenities and occupancy standards. Planning regulates the use of the land. Neither consent implies the other.
Where a property was already lawfully in C4 use before a direction took effect, that use survives the direction. Proving it is the work. Assemble the licence history, council tax records showing the pattern of occupation, tenancy agreements bridging the relevant dates, and electoral roll entries. Where the position matters to value, apply under section 191 of the Town and Country Planning Act 1990 for a certificate of lawful existing use and settle it before you sell rather than during.
Commercial stock and Class MA directions
The other heavily used direction targets the commercial-to-residential right in Part 3 Class MA.
That class permits a change from Class E commercial, business and service use to residential, subject to conditions including a minimum period of prior Class E use and the prior approval subjects the class lists. Its conditions were amended in 2024, so read the class as currently in force rather than relying on figures published before that, and check the version in force on the day you intend to apply.
Councils have made directions over town centres, primary shopping frontages and industrial estates to stop the right eroding employment and retail floorspace. A direction over a high street can be narrow, covering ground floor units on named streets only, which is exactly the kind of detail a map layer flattens and the direction schedule spells out.
For an investor, the consequence is that the residual land value calculation changes. A full application for change of use brings affordable housing policy, space standards, daylight requirements and section 106 obligations into play, none of which apply to a Class MA prior approval.
Immediate directions as a transaction risk
Most directions are non-immediate and take effect long after they are made. Some are immediate, taking effect on the day they are made, and used where the council judges that development would harm an area of particular importance. An immediate direction lapses unless the council confirms it within six months.
That creates a live risk between exchange and completion. A check carried out six weeks before completion can be out of date on the day. Where the deal depends on a permitted development right, re-run the Article 4 check immediately before completion and consider a contractual mechanism that addresses a direction made in the interim.
Compensation and the twelve month gap
Sections 107 and 108 of the Town and Country Planning Act 1990 allow a compensation claim where permitted development rights have been withdrawn and permission is subsequently refused or granted with conditions. The route is narrow, the time limits are short, and it does not arise where the council published notice of the withdrawal a sufficient period before it took effect.
Which is why councils delay non-immediate directions by at least a year. That delay is an opportunity as well as a warning. Development lawfully begun and completed before the direction takes effect stays lawful, and the notice gives you a dated deadline to work back from.
What to do when a direction applies
Three options, in order of cost.
Establish that the use or works are already lawful, through a section 191 certificate, if the evidence supports it. Apply for planning permission on the merits, with the amenity, refuse, parking and room standard evidence the policy demands, and expect a decision on the merits rather than a formality. Or reprice, because the value of the property in its current use is now the value.
Do not build first and apply later in an Article 4 area. A retrospective application attracts a fee, loses the benefit of the doubt, and in an HMO case may run alongside a licensing investigation.
A Planning Statement setting out the lawful use, the direction that applies, the policy tests and the evidence is the spine of any of those routes. Enter your postcode on PlanScope to see which reports the scheme 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. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Will a local authority search tell me about an Article 4 direction?
Not reliably. The standard enquiries cover conservation area designation well and Article 4 coverage inconsistently, partly because older directions were never digitised. Raise it as a specific additional enquiry, check the national Article 4 datasets, and ask the council's planning department directly in writing which classes are withdrawn at the address.
Does a direction undo an existing lawful use?
No. A direction removes the right to carry out future development. If the property was already lawfully in use as a small house in multiple occupation before the direction took effect, that use remains lawful. Proving it is the practical problem, and a certificate under section 191 of the 1990 Act is the way to put it beyond argument.
Which permitted development right do HMO directions target?
The right in Part 3 of Schedule 2 to the GPDO 2015 that allows a change between use class C3, a dwellinghouse, and use class C4, a small house in multiple occupation for between three and six residents. Many councils in university towns and cities have withdrawn it across whole wards so each conversion is assessed on amenity, refuse and parking grounds.
Is an HMO licence the same as planning permission?
No, and conflating them is a common and expensive error. Licensing sits under the Housing Act 2004 and regulates management standards, amenities and occupancy. Planning controls the use of the land. A property can hold a valid licence and still be in breach of planning control, and the council's two teams do talk to each other.
Can I claim compensation if a direction blocks my scheme?
Sections 107 and 108 of the Town and Country Planning Act 1990 allow a claim where permitted development rights have been withdrawn and permission is then refused or conditioned, but the route is narrow and tightly time-limited. It does not arise where the council gave sufficient notice before the direction took effect, which is why most non-immediate directions are delayed by a year.
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.