Do I Need Planning Permission for an HMO? Article 4 Directions Explained

Fact-check: unresolved

• Notice table, "Non-immediate" row: the checker flagged "usually 12 months" as unverifiable. Its suggested wording ("often 12 months") has been applied, but the one-round fix limit meant it was not re-verified. Please confirm before publishing.

In England, converting a family house into a small HMO for three to six unrelated sharers does not normally need planning permission, because the change from Class C3 to Class C4 is permitted development under Class L of the General Permitted Development Order 2015. Where the council has made an Article 4 direction, that right is removed and a planning application is required first.

This article is for general information purposes only and does not constitute legal advice. Landlords should seek independent legal advice for their specific circumstances. It describes the position in England.

Why is HMO planning permission in the news?

Article 4 directions on HMOs are spreading. In October 2026, Knowsley Council voted for a direction, following Liverpool, Sefton and Halton elsewhere in the Liverpool City Region, and Wirral Council asked its chief planner to examine a borough-wide direction. In September 2026, Bradford and Breckland councils were reported to be considering directions of their own.

For landlords, the practical effect is that a conversion that needed no permission last year may need one now. The rules are separate from HMO licensing, and the two are often confused.

What counts as an HMO for planning purposes?

Planning law uses two categories, set by the Town and Country Planning (Use Classes) Order 1987.

Class C3 (dwellinghouses) covers a house used by a single household, or by up to six residents living together as a single household. Class C4 (houses in multiple occupation) covers a dwellinghouse used by not more than six residents as a house in multiple occupation, adopting the definition in section 254 of the Housing Act 2004. A section 257 converted block of flats is excluded. In broad terms, that means three or more people forming two or more households and sharing a kitchen, bathroom or toilet.

An HMO with seven or more residents falls outside Class C4. It is generally treated as a sui generis use, meaning it belongs to no use class, and a change to that use is normally treated as needing planning permission wherever the property is. Whether a particular change is "material" is ultimately a question of fact and degree for the council.

The full class definitions are in the Schedule to the Use Classes Order.

When is a C3 to C4 change permitted development?

A change of use from C3 to C4, and back again from C4 to C3, is granted automatic planning permission by Class L of Part 3 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015. Permitted development, meaning development that the Order grants planning permission for without an application, lets a landlord let a house to sharers without involving the planning department at all.

Class L has limits. It does not permit a single house to be turned into two or more separate C3 dwellings or two or more separate C4 HMOs. Building work, such as extensions or dormers, is assessed separately under its own rules.

What is an Article 4 direction?

An Article 4 direction is an order made by the local planning authority under article 4 of the 2015 Order that withdraws specified permitted development rights in a defined area. For HMOs, councils use it to remove the Class L right to change from C3 to C4. Inside the area, a change to a small HMO then needs a full planning application, which the council decides against its local plan policies, often including limits on the concentration of HMOs in a street or neighbourhood.

Directions can cover a few streets or a whole district. They do not apply retrospectively in the sense of forbidding all HMOs; they control new changes of use from the date they take effect.

How much notice does a council have to give?

Schedule 3 to the 2015 Order sets the procedure. For a standard (non-immediate) direction, the council must publish a local advertisement, display site notices for at least six weeks, allow at least 21 days for representations, and name a coming-into-force date at least 28 days, and no more than two years, after the representation period begins. The direction only comes into force if the council confirms it after considering the representations received.

Councils can also make an immediate direction for Class L, which takes effect as soon as notice is given. It expires after six months unless the council confirms it within that time, after considering representations. Knowsley's direction, for example, was reported as taking effect on publication of the legal notice, followed by a 21-day consultation.

Many councils choose a 12 month lead-in for a reason. Under section 108 of the Town and Country Planning Act 1990, compensation can be payable where permitted development rights are withdrawn and a planning application is then refused. In England, that liability is excluded where notice of the withdrawal was published at least 12 months before it took effect, subject to the conditions in the section. A direction with less notice exposes the council to compensation claims for applications made within 12 months of it taking effect.

The full procedure is in Schedule 3 to the 2015 Order.

How do I check whether my property is covered?

Check the council's planning pages, which normally publish a map or street list for each direction in force and each one proposed. When buying, the planning replies in a local authority search are another place a direction may show up. If the boundary is unclear, a written enquiry to the planning department, quoting the full address, gives a record of the answer.

It is worth checking proposed directions as well as confirmed ones. A non-immediate direction published today may take effect in a year, and a landlord who completes a conversion before then is generally understood to be outside its reach.

What if my HMO existed before the direction took effect?

It is generally understood that a direction removes permitted development rights only from the date it takes effect, so a C4 use lawfully begun before that date is not made unlawful by it. The difficulty is evidence. If the council later questions the use, the landlord will need to show when it began and that it has continued.

The formal route is a lawful development certificate, meaning a certificate under section 191 of the Town and Country Planning Act 1990 confirming that an existing use is lawful. Applications usually rely on tenancy agreements, rent records, council tax records, licence documents and safety certificates showing occupation by sharers from a given date.

What happens if I convert without permission?

Converting in an Article 4 area without permission is a breach of planning control. The council can serve an enforcement notice requiring the HMO use to stop, and the landlord can appeal to the Planning Inspectorate. Failing to comply with an enforcement notice once the period it allows for compliance has ended is a criminal offence for the owner under section 179 of the 1990 Act.

In England, the time limit for enforcing against an unauthorised change of use to a dwellinghouse is ten years from the breach where the breach occurred on or after 25 April 2024, following amendments to section 171B made by the Levelling-up and Regeneration Act 2023. Other changes of use already had a ten year limit. For breaches before that date, a shorter four year limit may apply in some cases, and specialist advice is needed. A planning breach is also a separate problem from licensing: a council that finds an unauthorised HMO will often look at licensing compliance at the same time.

Is planning permission the same as an HMO licence?

No. Planning permission is governed by the Town and Country Planning Act 1990; HMO licensing is governed by Part 2 of the Housing Act 2004. One does not imply the other.

The licensing thresholds are covered in our guides to the mandatory HMO licensing threshold and mandatory and additional HMO licensing. Some areas also run selective licensing for all rented homes, and our guide on how to check whether your area has a scheme explains where to look. Operating a licensable HMO without a licence can also lead to a rent repayment order.

What should a landlord planning an HMO do now?

1. Check the council's planning pages for Article 4 directions in force and proposed, and keep a dated copy of what you found.
2. Count the intended residents. Seven or more normally needs planning permission everywhere.
3. If a direction applies, take planning advice and apply before converting.
4. If a direction is proposed, note its coming-into-force date.
5. If an HMO already exists, gather evidence of when the C4 use began and consider a lawful development certificate.
6. Check HMO licensing separately, including any additional licensing scheme.

Keeping the evidence that dates your HMO use

The question a council asks about an existing HMO is usually when the use started, and the answer is in documents most landlords already hold but rarely keep together. The LLCR platform keeps tenancy records, licences and safety certificates against each property with their dates, in a document vault alongside compliance tracking for licence and certificate renewals. That can help when assembling evidence for a lawful development certificate or answering a council enquiry. Our guide to how councils find non-compliant landlords explains where those enquiries tend to start.

Running an HMO or planning one? The free LLCR compliance checker takes a few minutes and shows where your licensing and certificate records stand.