Planning Permission for HMO Properties UK: Rules Explained
Planning permission HMO UK requirements are an important consideration for landlords and property investors who want to convert a house into a House in Multiple Occupation (HMO), increase the number of occupants or change the way a residential property is used.
Whether you are purchasing an investment property, converting a family home into an HMO or expanding an existing HMO, the planning position should be established before work begins or tenants move in.
In England, the planning position often depends on the property’s existing Use Class, the proposed HMO use and whether permitted development rights apply. A small HMO can fall within Class C4, while an HMO with more than six residents falls outside C4 and is generally treated as sui generis for planning purposes.
Article 4 Directions can also remove permitted development rights that would otherwise allow a change from a C3 dwellinghouse to a C4 HMO without a standard planning application.
This guide explains planning permission for HMO properties UK, including C3 and C4 use classes, Article 4 Directions, large HMOs, planning applications, licensing, material considerations, objections and enforcement.
Key Takeaways
- A small HMO for 3 to 6 residents can fall within Class C4 in England.
- A change from C3 dwellinghouse to C4 HMO can benefit from permitted development rights in England where those rights have not been removed.
- An Article 4 Direction can remove those permitted development rights in a defined area, meaning planning permission may be required for a C3 to C4 change.
- HMOs with more than six residents fall outside Class C4 and are generally treated as sui generis.
- Planning permission and HMO licensing are separate requirements.
- Mandatory HMO licensing generally applies to properties occupied by 5 or more people forming more than one household, although additional licensing schemes can apply locally.
- Planning applications can consider issues such as residential amenity, parking, traffic, waste, layout and the character of the area.
- The planning rules discussed here primarily concern England.
What Is an HMO in the UK?
A House in Multiple Occupation (HMO) is generally a property occupied by at least three people who form more than one household and share facilities such as a kitchen, bathroom or toilet.
For housing legislation, GOV.UK describes an HMO as a property where at least three tenants live together as more than one household and share facilities.
The term HMO can therefore cover a range of shared accommodation arrangements.
However, it is important to distinguish the housing definition of an HMO from the planning Use Class that applies to the property.
For planning purposes in England, a small HMO can fall within Class C4, while HMOs outside the C4 definition can be treated as sui generis.
Why Is Planning Permission Important for HMOs?
Changing a conventional dwelling into an HMO can affect how a property is used and may have implications for the surrounding area.
Depending on the proposal and local planning policies, issues can include:
- parking pressure;
- traffic and access;
- waste storage and collection;
- noise and disturbance;
- residential amenity;
- property layout;
- the character of the area;
- concentration of HMOs; and
- the suitability of the property for the proposed use.
Planning permission provides the mechanism for the Local Planning Authority to assess development where permission is required.
Before purchasing or converting a property, it is therefore important to establish whether the proposed HMO use is already lawful, benefits from permitted development rights or requires a planning application.
HMO Use Classes: C3 and C4 Explained
Understanding C3 and C4 is central to HMO planning in England.
What Is Class C3?
Class C3 covers dwellinghouses.
This is the planning use associated with ordinary residential dwellings.
What Is Class C4?
Class C4 covers houses in multiple occupation occupied by 3 to 6 residents living as more than one household and sharing basic amenities.
The Planning Portal confirms that C4 is limited to houses with no more than six residents.
This distinction is important because the planning route can change depending on the number of residents and the property’s existing lawful use.
Do You Need Planning Permission for an HMO?
Not necessarily.
In England, a change from Class C3 dwellinghouse to Class C4 HMO can benefit from permitted development rights where the relevant right applies and has not been removed.
This means that some small HMO conversions can take place without submitting a full planning application.
However, you should not assume that every C3 property can automatically be converted into a C4 HMO.
The planning position should be checked against:
- the property’s existing lawful use;
- the proposed number of occupants;
- whether the proposed HMO falls within C4;
- permitted development rights;
- Article 4 Directions;
- planning conditions;
- the property’s planning history; and
- any relevant local planning policies.
C3 to C4 HMO: When Can Permitted Development Apply?
Where the relevant permitted development right applies, a qualifying change from C3 to C4 can take place without a standard planning application.
However, permitted development rights are not universal.
An Article 4 Direction can remove the relevant right within a defined area. Where this happens, a landlord seeking to change a C3 dwelling to a C4 HMO may need to apply for planning permission.
The safest approach is therefore to check the planning position for the specific property and location before proceeding.
Article 4 Directions and HMO Planning Permission
An Article 4 Direction allows a local planning authority to remove specified permitted development rights in a defined area.
For HMOs, councils can use Article 4 Directions to remove the permitted development right for changing a C3 dwellinghouse into a C4 HMO.
Where an applicable Article 4 Direction is in force, planning permission may be required before carrying out the change of use.
This is particularly important for landlords purchasing properties in areas with significant concentrations of shared housing.
Article 4 controls are location-specific, so the fact that one property can be converted from C3 to C4 without planning permission does not mean the same applies to another property elsewhere.
Before relying on permitted development, check:
- whether an Article 4 Direction applies;
- the geographical area covered;
- when the Direction took effect;
- whether it affects the relevant permitted development right; and
- whether any planning conditions or other restrictions apply.
Large HMOs and Sui Generis Planning Use
An HMO with more than six residents does not fall within Class C4.
The Planning Portal explains that because C4 is limited to houses with no more than six residents, HMOs with more than six residents become sui generis, meaning a use of its own kind.
A proposal for a larger HMO therefore needs to be considered separately from the C3-to-C4 permitted development route.
Where planning permission is required, the Local Planning Authority may consider matters such as:
- the size and layout of the property;
- the number of proposed occupants;
- bedroom and communal arrangements;
- parking and access;
- waste storage;
- noise and disturbance;
- neighbouring amenity;
- the character of the area; and
- relevant local planning policies.
HMO Licensing vs Planning Permission
Planning permission and HMO licensing are separate requirements.
Planning permission concerns the lawful planning use and development of land or buildings.
HMO licensing concerns the management and housing standards applicable to the property.
A landlord may therefore need both planning permission and an HMO licence.
GOV.UK states that large HMOs generally require a licence where they are occupied by 5 or more people forming more than one household and sharing facilities, while smaller HMOs can also require licensing under local additional licensing schemes.
Obtaining an HMO licence does not automatically give planning permission for the use.
Equally, obtaining planning permission does not automatically satisfy the property’s licensing requirements.
Both should be checked separately.
How to Apply for Planning Permission for an HMO
Where planning permission is required, the process will generally involve several stages.
1. Check the Existing Planning Use
Establish the property’s lawful existing use and planning history.
2. Identify the Proposed HMO Use
Determine whether the proposed property would fall within C4 or a sui generis HMO use.
3. Check Article 4 Directions
Confirm whether an Article 4 Direction removes the relevant permitted development rights.
4. Review Local Planning Policies
Check the Local Planning Authority’s development plan and any HMO-specific planning guidance.
5. Consider Pre-Application Advice
For more complex proposals, pre-application advice may help identify potential planning issues before a full application is submitted.
6. Prepare the Application
Depending on the proposal, supporting information can include:
- application forms;
- location plans;
- site plans;
- existing and proposed floor plans;
- elevations where relevant;
- planning statements;
- transport or parking information;
- waste management arrangements;
- management information; and
- other supporting documents requested by the Local Planning Authority.
7. Submit the Application
Planning applications can generally be submitted through the relevant planning application system.
8. Consultation and Assessment
The Local Planning Authority may consult neighbours and relevant consultees and assess the proposal against the development plan and other material considerations.
9. Decision
The authority may grant permission, grant permission subject to conditions or refuse the application.
How Long Does HMO Planning Permission Take?
The statutory determination period in England is generally 8 weeks for non-major planning applications and 13 weeks for major applications, unless a longer period is agreed or another statutory period applies.
The actual timescale can be longer depending on:
- the complexity of the proposal;
- whether additional information is requested;
- consultation;
- planning committee consideration;
- amendments;
- technical reports; and
- an agreed extension of time.
The original article’s statement that planners have “8–12 weeks” is therefore too broad for a current England-focused article. The statutory periods should instead be stated according to the application type.
What Do Councils Consider in HMO Planning Applications?
Where planning permission is required, the Local Planning Authority will assess the proposal against relevant planning policies and material considerations.
Potential considerations can include:
Residential Amenity
The council may consider whether the proposed HMO would cause unacceptable noise, disturbance or other effects on neighbouring properties.
Parking and Highway Issues
The proposal may be assessed in relation to parking availability, access, traffic movements and highway safety.
Property Layout
The size, layout and arrangement of rooms and shared facilities can be relevant to the planning assessment.
Waste Storage
Adequate arrangements for refuse storage and collection can be important, particularly where several occupants will share the property.
Character of the Area
The authority may consider the effect of the proposal on the character and appearance of the surrounding area.
Concentration of HMOs
Some local authorities have planning policies addressing concentrations of HMOs or the cumulative effect of shared housing in particular areas.
The precise policy tests vary between Local Planning Authorities, so local planning policy should be checked rather than assuming that the same threshold applies everywhere.
HMO Planning Problems and Common Objections
HMO planning applications can attract objections concerning:
- parking;
- traffic;
- noise;
- anti-social behaviour;
- waste;
- overcrowding;
- neighbourhood character;
- concentration of HMOs; and
- impact on neighbouring properties.
However, an objection does not automatically determine the outcome of a planning application.
The Local Planning Authority must assess the proposal against the relevant planning framework and material considerations.
A well-prepared application should therefore address the planning issues relevant to the particular property and location.
What Happens If You Operate an HMO Without the Correct Planning Permission?
If planning permission is required and a property is being used without the necessary permission, the Local Planning Authority may investigate and consider enforcement action.
Potential consequences can include:
- an enforcement notice;
- restrictions on the unauthorised use;
- requirements to stop or change the use;
- legal and professional costs; and
- difficulties when selling or refinancing the property.
The precise consequences depend on the circumstances and the nature of the planning breach.
This makes it important to establish the planning position before purchasing, converting or letting a property as an HMO.
Can You Apply for Retrospective Planning Permission for an HMO?
Where development has already taken place without the required planning permission, a retrospective planning application may be possible.
However, submitting a retrospective application does not guarantee that permission will be granted.
The proposal will still be assessed against the relevant planning policies and material considerations.
If the application is refused, the Local Planning Authority may consider enforcement action in accordance with the circumstances of the case.
HMO Planning Permission and Property Investment Due Diligence
Planning due diligence should be part of the process when purchasing an HMO investment property.
Before committing to a purchase, consider checking:
- the property’s lawful planning use;
- previous planning permissions;
- planning conditions;
- whether the property is already an HMO;
- the number of current occupants;
- whether an Article 4 Direction applies;
- whether the proposed use is C4 or sui generis;
- HMO licensing requirements;
- parking and access;
- local HMO policies;
- enforcement history; and
- any proposed changes to the property.
This can help identify planning restrictions before you commit significant capital to an investment.
Frequently Asked Questions About HMO Planning Permission
Do I need planning permission to convert a house into an HMO?
Not always. In England, a qualifying C3 dwellinghouse can benefit from permitted development rights when changing to a C4 HMO, provided the relevant rights apply and have not been removed by an Article 4 Direction or another restriction.
What planning use class is an HMO?
A small HMO occupied by 3 to 6 residents can fall within Class C4 in England. An HMO with more than six residents falls outside C4 and is generally treated as sui generis.
Can I convert a C3 property to a C4 HMO without planning permission?
Potentially. The C3-to-C4 change can benefit from permitted development rights where the relevant right applies. However, an Article 4 Direction can remove that right and make planning permission necessary.
What is an Article 4 Direction for HMOs?
An Article 4 Direction can remove specified permitted development rights within a defined area. For HMOs, this can mean that a C3 dwellinghouse cannot be changed to a C4 HMO without first obtaining planning permission.
Does a large HMO need planning permission?
An HMO with more than six residents falls outside Class C4 and is generally treated as sui generis. Whether planning permission is required depends on the proposed development and planning circumstances, but the C3-to-C4 permitted development route does not cover a larger sui generis HMO.
Is HMO licensing the same as planning permission?
No. Planning permission concerns the planning use and development of the property, while HMO licensing concerns housing and management requirements. A property may need both.
How many people can live in a C4 HMO?
Class C4 covers HMOs with 3 to 6 residents within the relevant planning definition in England.
Does an HMO with 5 occupants need a licence?
A large HMO generally requires a licence where it is occupied by 5 or more people forming more than one household and sharing facilities, although local additional licensing schemes can apply to smaller HMOs as well.
How long does HMO planning permission take?
In England, the statutory determination period is generally 8 weeks for non-major applications and 13 weeks for major applications, unless an extension or another statutory period applies.
Can I get retrospective planning permission for an HMO?
A retrospective planning application may be possible where an HMO use has already started without the required planning permission. However, submitting an application does not guarantee approval, and enforcement issues may still arise.
HMO Planning Permission Checklist
Before converting or purchasing an HMO property, check:
- What is the property’s existing lawful planning use?
- How many occupants are proposed?
- Would the property fall within C4?
- Would the proposed use be sui generis?
- Does a C3-to-C4 permitted development right apply?
- Does an Article 4 Direction apply?
- Are there planning conditions affecting the property?
- Does the property require an HMO licence?
- Does an additional or selective licensing scheme apply locally?
- What does the local planning policy say about HMOs?
- Are parking, access and waste arrangements adequate?
- Could the proposal affect neighbouring residential amenity?
- Is planning permission required before the property is occupied?
- Is retrospective planning permission an issue?
- Are there any previous planning or enforcement matters affecting the property?
How Charrette Law Can Help With HMO Planning Permission
HMO planning can involve more than simply establishing whether a property needs planning permission.
The correct planning route may depend on the property’s existing lawful use, proposed number of occupants, Use Class, permitted development rights, Article 4 Directions and local planning policy.
Charrette Law can assist with:
- HMO planning advice;
- planning applications;
- change of use;
- Article 4 Directions;
- permitted development;
- planning due diligence;
- planning objections;
- planning refusals;
- retrospective planning applications;
- planning appeals; and
- wider property development strategy.
Conclusion
Planning permission HMO UK requirements depend on the type of HMO, the property’s existing planning use, the number of proposed occupants and the planning controls affecting the property.
In England, a small HMO can fall within Class C4, while HMOs with more than six residents fall outside C4 and are generally treated as sui generis. A C3-to-C4 change can benefit from permitted development rights where applicable, but an Article 4 Direction can remove those rights and require a planning application.
Planning permission should also be considered separately from HMO licensing. A property may need both, and meeting one requirement does not automatically satisfy the other.
Before purchasing, converting or letting a property as an HMO, checking the planning position early can help identify restrictions and reduce the risk of enforcement problems.
Contact Charrette Law for advice on HMO planning permission, change of use, Article 4 Directions, planning applications or wider property development matters.
