01 · What it isWhat an Article 4 Direction actually does
Permitted development rights are the bit of planning law that lets you make certain changes to a property, build a small extension, add a loft conversion, change a use class, without applying for full planning permission. They are set out in the Town and Country Planning (General Permitted Development) (England) Order 2015, which most of the industry just calls the GPDO 2015. Parliament granted these rights because the alternative, requiring planning permission for everything, would jam the system.
An Article 4 Direction is a local planning authority's tool for taking one or more of those rights away in a specific geographic area. The authority makes the direction under Article 4 of the GPDO 2015, usually after a consultation, and usually with 12 months' lead time (an immediate direction is possible but is rarer and may carry compensation risk). Once the direction takes effect, the permitted development right in question disappears within the named area, and anyone wanting to do that development has to apply for full planning permission.
In the HMO context, the A4D that matters is the one removing the Class C3 (dwellinghouse) to Class C4 (small HMO) change of use. Without an A4D, a landlord can convert a single-family home into a small shared HMO for up to six unrelated people without a planning application; the C3 to C4 shift is permitted development under the GPDO 2015. With an A4D in force, that conversion requires a full planning application, with the ordinary risks of refusal, neighbour objection, conditions, and appeal.
Why councils introduce A4Ds
Article 4 Directions for HMOs are introduced because councils want to control where and how small HMOs proliferate. Concentrations of HMOs in single streets have been associated with anti-social behaviour, refuse-collection pressures, parking saturation and the erosion of family-housing supply. A4D gives the council a tool to consider each HMO conversion on its planning merits, rather than find out about it after licensing.
02 · Use classesC3, C4 and Sui Generis, the three use classes a landlord cares about
HMO planning sits inside the residential use classes defined by the Town and Country Planning (Use Classes) Order 1987 as amended. Three classes matter for landlords.
| Use class | Definition | Planning position |
|---|---|---|
| C3 · Dwellinghouse | Use as a single-family dwelling, or by up to six residents living together as a single household, including households where care is provided for a resident. | The residential default. No planning permission required for ordinary single-family use. |
| C4 · Small HMO | Small HMO occupied by between three and six unrelated individuals as their main residence, who share basic amenities (kitchen, bathroom). | C3 to C4 change is permitted development under the GPDO 2015 Schedule 2, Part 3, Class L, unless an Article 4 Direction has removed it. |
| Sui Generis · Large HMO | HMO occupied by seven or more unrelated individuals sharing amenities. Falls outside the Use Classes Order; a category of its own. | Always requires full planning permission. The GPDO does not grant permitted development into Sui Generis use. A4D is irrelevant here, permission is required everywhere for 7+ person HMOs. |
A4D only changes the permitted-development story for the C3 to C4 route. It does not create a new requirement for large HMOs (they were always a planning application) and it does not affect C3 to C3 lets where no HMO use arises. Landlords most often get caught out when they assume "small HMO, under seven people, therefore permitted development" without checking whether the borough has an A4D.
03 · BoroughsLondon boroughs with Article 4 Directions in force for HMOs
The pattern across London is that more boroughs are introducing A4D each year, and the coverage types vary, borough-wide, ward-specific, postcode-limited, and occasionally time-limited. The table below reflects the general picture as at early 2026. Coverage changes with council policy; always verify current status with the specific borough before acting.
| Coverage type | Boroughs (illustrative, not exhaustive) | Practical implication |
|---|---|---|
| Borough-wide A4D | Waltham Forest, Newham, Barking & Dagenham, Enfield, Haringey, Redbridge, Brent, Hackney | Any C3-to-C4 small HMO conversion anywhere in the borough requires planning permission. |
| Partial / ward-specific A4D | Tower Hamlets, Southwark, Camden, Lewisham, Hounslow, Ealing (selected wards or postcodes) | Check the borough's A4D map for the specific street or ward before assuming permitted development applies. |
| No A4D in force (C3-to-C4 permitted) | Several outer-London boroughs. Coverage evolves; inclusion here is no guarantee for any specific site. | C3-to-C4 conversion is permitted development under the GPDO 2015, but the council may still introduce A4D at any time, and mandatory or additional HMO licensing may still apply. |
| Always check | Every borough without exception | Get written confirmation from the borough planning team before buying or converting. A4D coverage is the single-biggest cause of "we found out too late" HMO stories. |
For a current and detailed borough-by-borough picture of which London authorities have A4D, where it applies, and how it interacts with their HMO licensing regime, our HMO Licensing London Borough-by-Borough Guide maintains an A-Z list of all 33 boroughs with regime tags.
A4D can change faster than you think
Boroughs can and do consult on new A4D coverage with only 12 months' notice, and an immediate A4D is possible where the council can justify it (though this can create compensation liability). An investor buying a property for HMO conversion should check A4D status at the point of offer, at exchange, and at completion. A borough consultation that was open on the week of offer may have become a live direction by completion.
Article 4 is the single most common "I didn't know" story in London HMO investment. Landlords who check the licensing regime but not the planning regime buy a property that is a 5-bed HMO on paper, and find out at the first licensing inspection that the council considers the use unlawful. The fix is always a planning application with unusual risk; often it is a step backwards.
04 · Planning processIf A4D applies, the planning-application process
A C3-to-C4 planning application in an A4D area is a change-of-use application. It follows the standard planning-permission process.
- Pre-application advice (optional but recommended). Most London boroughs offer a paid pre-application service. For a conversion that may face policy resistance, a written pre-application response is worth the fee, it signals whether the application is likely to succeed, and flags any conditions the officer will expect.
- Prepare the application. Change-of-use applications require a planning statement explaining compliance with local plan policies (HMO concentration, amenity, parking, refuse, noise), a drawing set showing existing and proposed internal layouts, and where relevant a design and access statement. Some boroughs require a noise-assessment, a transport statement, or a refuse-and-cycle-storage plan.
- Submit via the Planning Portal. Application fees are set under the Planning Fees Regulations 2012 (as amended); a change-of-use application for a domestic dwelling was £578 at mid-2024 rates and is reviewed periodically. Add consultant fees (planning consultant typically £1,500–£4,000 for a small HMO change of use in London).
- Validation and registration. The council checks the application is complete. Target validation 5 working days. Once validated, the statutory 8-week target determination clock starts.
- Consultation. Neighbour notifications go out. Site notices may be posted. Statutory consultees (highways, environmental health) may comment. Most HMO conversions attract at least one objection; the officer weighs the substance.
- Determination. Officer recommendation to approve or refuse. Smaller applications determined under delegated powers; larger or contentious ones escalated to planning committee. London boroughs often overrun the 8-week target, budget 10–16 weeks in practice.
- Decision. Approval (with conditions) or refusal. Conditions typically cover occupancy limits, refuse storage, cycle storage, parking restrictions, and noise management. Refusal comes with right of appeal to the Planning Inspectorate; appeal adds 3–9 months.
05 · A4D vs HMO licensingArticle 4 versus HMO licensing, two regimes, independently applied
The most-asked question on any HMO conversion: "I have an HMO licence from the council, does that mean planning is fine?" No. They are two separate regimes. A council can grant an HMO licence for a property that does not have planning permission, the licensing team typically does not check planning status before issuing. And a council can grant planning permission for a property that cannot yet operate as an HMO because the relevant licence has not been issued.
| Aspect | Article 4 Direction / planning | HMO licensing |
|---|---|---|
| Legal basis | Town and Country Planning Act 1990; GPDO 2015 Article 4 | Housing Act 2004 Parts 2 (Mandatory) and 3 (Additional / Selective) |
| What it controls | Whether change of use from C3 to C4 requires planning permission | Whether an operating HMO requires a licence from the council |
| Trigger threshold | Any C3-to-C4 change in an A4D area | Varies: Mandatory = 5+ persons / 2+ households; Additional and Selective vary by borough scheme |
| Application to | Borough planning department | Borough licensing / housing team |
| Granted by | Planning officer or committee | Licensing officer |
| Enforcement | Planning Contravention Notice, Enforcement Notice, criminal offence on non-compliance | Licensing offences, Rent Repayment Orders, banning orders, criminal prosecution |
| Relationship | Independent. Both apply where both are triggered. An approval on one does not confer approval on the other. | |
In an A4D borough with Additional Licensing, the sensible conversion sequence is: check A4D coverage first; if it applies, submit the planning application; once permission is granted, submit the HMO licence application with the planning approval referenced; commission works; operate. Doing it the other way round (licence first, then planning) risks operating the HMO under licence while in breach of planning control, the council can (and does) enforce against the planning breach even where the licence is valid.
06 · Worked exampleHaringey 3-bed conversion, timeline and decision points
Victorian terrace in South Tottenham, landlord plans 5-bed HMO
An investor buys a 3-bed Victorian terrace in Haringey N15 with the intention of converting to a 5-bed shared-house HMO. Haringey has a borough-wide Article 4 Direction for C3-to-C4 conversions. The property is not already an HMO. Haringey also operates an Additional Licensing scheme in the relevant ward. Here is how the conversion sequences.
- Week 0 · Pre-offer. Landlord checks Haringey's planning portal for A4D coverage and confirms borough-wide A4D for C3-to-C4 applies to this address. Licensing check confirms Additional Licensing applies for 3+ person shared-house HMOs in the ward. Decision: both regimes engage.
- Week 2 · Pre-application. Landlord commissions a planning consultant to prepare a pre-application submission. £400 pre-app fee. Response in 4 weeks indicates the application is likely acceptable subject to standard conditions on refuse, cycle storage, and occupancy cap at 5 unrelated persons.
- Week 7 · Planning application submitted. Change-of-use application C3 to C4 via Planning Portal. Fee £578. Supporting documents: planning statement, existing/proposed floor plans, refuse and cycle storage strategy, noise management plan, occupancy-cap statement.
- Week 8 · Application validated. Council registers application; 8-week target determination clock starts.
- Week 10–12 · Neighbour consultation. Two objections received citing parking and noise. Officer response incorporates conditions.
- Week 15 · Officer report and decision. Application determined under delegated powers. Permission granted with conditions covering occupancy, refuse/cycle storage and anti-social-behaviour management.
- Week 15–20 · Works. Landlord commissions FRA, fire-alarm installation (Grade D1 LD2 under LACORS), fire doors, lockshields on bedroom doors, kitchen heat detector. Full compliance package delivered by a single contractor.
- Week 20 · HMO licence application. Additional Licensing application submitted to Haringey licensing, referencing the planning permission, fire-risk assessment, fire-alarm design, EICR, gas safety certificate, deposit-protection details. Fee (borough-specific, around £1,500 per HMO typical 2026 figure).
- Week 28 · Licence issued. Inspection visit confirmed spec. Licence granted with standard conditions. Property legally operable as HMO.
- Total elapsed time: ~28 weeks from initial offer to legal operation. A shorter path (direct HMO licence application without planning) would have failed and left the landlord with an enforcement notice instead of an income stream.
28 weeks
A realistic end-to-end conversion timeline for a 5-bed shared-house HMO in an A4D borough with Additional Licensing, including pre-application, planning, works and licence issue. Compressing the planning stage is the route that most often fails.
07 · FAQsQuestions HMO landlords keep asking
What is an Article 4 Direction?
An Article 4 Direction is an order made by a local planning authority under Article 4 of the Town and Country Planning (General Permitted Development) (England) Order 2015. It removes specified permitted development rights within a defined geographic area. For HMOs, the most common A4D removes the C3-to-C4 permitted change of use, meaning conversions require full planning permission. A4D exists because councils want to control where and how small HMOs proliferate.
How do I find out if Article 4 applies to my property?
Check the local planning authority's website for its Article 4 Direction map or register. Most London boroughs publish a searchable map or a schedule of affected streets. If in doubt, submit a planning enquiry or a formal written pre-application query to the council. Never assume permitted development applies without a written check for any property in a borough with any A4D in force.
Which London boroughs have Article 4 Directions in force for HMOs?
A growing number of London boroughs have C3-to-C4 Article 4 Directions covering either the whole borough or specific wards. Borough-wide A4D has been introduced in authorities including Waltham Forest, Newham, Barking and Dagenham, Enfield, Haringey, Redbridge, Brent and Hackney, with ward-level coverage in others such as Tower Hamlets, Southwark, Camden and Lewisham. Coverage evolves; always verify current status with the relevant borough before planning a conversion.
How is an Article 4 Direction different from HMO licensing?
They are separate regimes. Article 4 is planning law (TCPA 1990 / GPDO 2015), controlling whether you need planning permission for C3-to-C4 change of use. HMO licensing is housing law (Housing Act 2004 Parts 2 and 3), controlling whether an operating HMO must hold a Mandatory, Additional or Selective licence. In areas with both A4D and Additional Licensing, you can need BOTH. Planning permission does not confer a licence; a licence does not confer planning permission.
How long does an Article 4 planning application take?
A standard change-of-use application is target-determined within 8 weeks from validation, though London boroughs often run longer in practice, expect 10 to 16 weeks. Neighbour objections, pre-application requirements and referral to committee can extend the timeline. Application itself requires a planning statement, floor plans, and fees set by the Planning Fees Regulations; budget the statutory fee plus any planning-consultant costs.
What happens if I breach an Article 4 Direction?
Converting to a small HMO without planning permission in an A4D area is a breach of planning control. The council can issue a Planning Contravention Notice to gather information, and then an Enforcement Notice requiring the use to cease. Non-compliance with an Enforcement Notice is a criminal offence with an unlimited fine on conviction. The council can also apply for an injunction. Landlord loses HMO income for the enforcement period; later licensing applications must disclose the planning history.
FRA, fire-alarm design, fire doors, licence application, one team through the conversion
HSE delivers the full HMO compliance stack alongside the planning and licensing process. Fire risk assessment, Grade D1 LD2 alarm design, fire-door upgrade, resident pack, application file. One contractor, one compliance file per HMO.
08 · Where to go nextTwo practical follow-ups
If your next move is a specific HMO conversion in a specific London borough, these are the two reads that close the loop.
First, the HMO Licensing London Borough-by-Borough Guide, the 22-minute mega-article with the A-Z of all 33 boroughs, their current Mandatory / Additional / Selective licensing regime, and their Article 4 status. Use it as the working reference alongside this explainer.
Second, subscribe to The HSE compliance briefing. One email a month covering regulatory and licensing updates. When a London borough introduces or amends an Article 4 Direction, you will hear it from Kevin within the week.
HSE service for this topic
HMO compliance service · fixed scope
FRA, fire-alarm design, fire doors, licence application pack, one team, one compliance file, delivered alongside the planning and licensing workstream.