Does a six-bedroom HMO need planning permission?

It depends on the number of residents, not bedrooms. Six residents is a small HMO (C4), usually permitted development unless an Article 4 direction applies. If any room will house two people and the total reaches 7, the house becomes a large HMO that always needs permission.

Does an Article 4 direction mean HMOs are banned?

No. An Article 4 direction removes the permitted development right to change a family house into a small HMO, so you need to apply for planning permission. The council then decides each application on its planning merits and its HMO policies.

Can I turn an HMO back into a family house without permission?

Class L permitted development allows a change from a small HMO (C4) back to a family house (C3) without an application, as long as the change does not create two or more dwellings. Check the position with the council where an Article 4 direction applies.

Do I need planning permission and an HMO licence?

You may need both. Planning deals with the use of the building and licensing deals with the standard of the accommodation and the licence holder. Thresholds differ: a 5 or 6 person HMO may need no planning application but does need a mandatory licence.

What is a certificate of lawful use for an HMO?

It is a formal council decision that an existing use is lawful. If a house has been used as an HMO for some time, a certificate backed by evidence such as tenancy and licensing records can confirm its lawful use. Buyers and lenders often ask for one.

HMO planning permission and Article 4 directions

Do I need planning permission for an HMO?

It depends on how many people will live in the house and on whether your council has an Article 4 direction for HMOs.

A small HMO for 3 to 6 people is in use class C4. Changing a family house to C4 is usually permitted development, so no planning application is needed, unless an Article 4 direction removes that right.
A large HMO for 7 or more people is sui generis and always needs planning permission, whether or not there is an Article 4 direction.

Planning is about the use of the building. It runs separately from HMO licensing, which is about the standard of the accommodation and the fitness of the licence holder, and from building regulations, which govern how the work is built. You may need all three, and having one does not give you the others. External alterations, such as dormers or extensions, can also need planning permission in their own right.

What are use classes C3, C4 and sui generis?

The Town and Country Planning (Use Classes) Order 1987 groups uses of land and buildings into classes. Three matter for HMOs.

Use	What it covers	Planning position
C3 dwellinghouse	A single household, or up to 6 residents living together as a single household	The normal use of a family house
C4 small HMO	A house used by 3 to 6 unrelated residents as an HMO	Change from C3 usually permitted development, unless an Article 4 direction applies
Sui generis large HMO	An HMO with 7 or more residents	Planning permission always needed

C4 uses the Housing Act 2004 meaning of an HMO but excludes section 257 converted blocks of flats. The 3 to 6 range follows from the HMO definition, which needs at least 3 people, combined with C4's limit of not more than six residents.

Large HMOs are sui generis, meaning of their own kind, because no use class covers them. The Use Classes Order does not name them; they fall outside every class.

What is Class L permitted development?

Permitted development rights let certain changes happen without a planning application. Class L, in Part 3 of Schedule 2 to the General Permitted Development Order 2015, allows two changes:

from a family house (C3) to a small HMO (C4); and
from a small HMO (C4) back to a family house (C3).

The change must not create two or more separate dwellings. Class L covers the change of use only. It does not cover building work such as extensions, dormers or new windows, which have their own permitted development rules and limits.

Moving back from C4 to C3 can matter when you sell, because it widens the market for the house. Where an Article 4 direction has removed the C3 to C4 right, check carefully how the council treats the return to C3, and keep records of how the house has been used.

What does an Article 4 direction do?

An Article 4 direction is made by a council to remove specific permitted development rights in a defined area. For HMOs, a direction usually removes the Class L right to change a family house (C3) into a small HMO (C4). Inside the area, that change then needs a planning application.

An Article 4 direction:

does mean you need planning permission for a C3 to C4 change in the area it covers;
does not ban HMOs. The council decides each application on its planning merits;
does not change anything for large HMOs, which already need permission everywhere;
does not affect HMO licensing, which is a separate regime.

Many Midlands councils have HMO Article 4 directions, and some cover the whole district while others cover particular wards or streets. Check the council's planning pages and maps for the exact boundary before you buy, and confirm whether the house already has a lawful HMO use.

What is a lawful development certificate for an HMO?

A lawful development certificate is a formal decision from the council confirming that a use or development is lawful. It is not planning permission. It records that permission is not needed, or that a use already in place is lawful.

There are two kinds:

For a proposed use. If you intend to change a family house to a small HMO under Class L, and you want certainty that no Article 4 direction applies and the change is permitted, a certificate for the proposed use gives a formal answer.
For an existing use. If a house has been used as an HMO for some time, a certificate for the existing use can confirm it is lawful. You will need evidence, such as tenancy records, licences and council tax records, showing how the house has been used.

Certificates are useful when buying or selling an HMO, when refinancing, and in Article 4 areas where the lawful use of a house is in question. Lenders and buyers often ask for evidence of lawful use. Our HMO planning service prepares certificate applications and the evidence behind them.

What do planning committees look at in HMO applications?

Each council sets its own planning policies for HMOs, often in a local plan policy and a supplementary planning document. The matters commonly considered include:

Concentration. How many HMOs are already in the street or surrounding area. Many councils use a threshold policy to avoid high concentrations of HMOs.
Sandwiching. Whether the proposal would leave a family house between two HMOs.
Living standards. Bedroom sizes, shared kitchen and living space, light and outlook.
Neighbour amenity. Noise, disturbance and the effect of more comings and goings.
Bins and bikes. Whether there is space to store waste, recycling and cycles off the street.
Parking and highways. The effect on on-street parking and road safety.
Character. The effect on the street scene, especially in conservation areas.

A well-prepared application deals with each relevant policy directly, with measured plans, a bin and cycle storage layout, and evidence on the concentration of existing HMOs where the policy asks for it.

How do I apply for HMO planning permission?

A typical route for a large HMO, or for a small HMO in an Article 4 area, looks like this:

Check the council's HMO policies and any concentration data it publishes.
Prepare measured existing and proposed floor plans, with room sizes and uses.
Show bin, recycling and cycle storage, and any parking.
Write a planning statement explaining how the proposal meets each relevant policy.
Submit the application and pay the fee set for that type of application.
Respond to consultee comments and any neighbour objections.

If permission is refused, there is a right of appeal. Ask about appeal time limits as soon as you receive a decision. Some councils offer pre-application advice, which can show whether a scheme is likely to be supported before you commit to full drawings.

Is building regulations approval separate from planning?

Yes. Planning decides whether a use or development is acceptable. Building regulations decide whether the work meets technical standards for safety, health and energy. You can have planning permission and still need building regulations approval, and the reverse.

An HMO conversion often requires building regulations approval. Under the Building Regulations 2010, a material change of use includes a building gaining more or fewer dwellings, newly containing rooms for residential purposes such as bedsit-style lettings, or changing the number of such rooms. Whether a particular conversion counts depends on the facts. Separately, the building work itself, such as structural alterations, new kitchens and bathrooms, drainage, fire separation and electrics, normally needs approval or a competent person scheme.

Sign-off comes from local authority building control or a registered building control approver. Our guide to converting a house to an HMO shows where each approval fits in the project.

Sources

This guide explains the rules in England as we understood them in October 2026. It is general information, not legal or financial advice. Check with your council and take professional advice for your own situation.