Do you need planning permission to turn a house into an HMO?

Planning permission for an HMO depends on the UK nation, the number of occupiers, and whether permitted development rights have been removed. In England the small-HMO answer can be no, but Wales, Scotland and Northern Ireland do not follow the same simple C3-to-C4 route.

Do you need planning permission to convert a house into an HMO?

Wales grants no C3-to-C4 permitted-development right at all, only the reverse under Class H, so converting a house into an HMO in Wales needs planning permission; in England, converting a C3 house to a C4 small HMO of up to six residents is permitted development unless an Article 4 direction removes that right, while a large HMO normally needs an application. England’s Class L includes the change “from a use falling within Class C3 (dwellinghouses) … to a use falling within Class C4 (houses in multiple occupation),” and C4 means “Use of a dwellinghouse by not more than six residents as a ‘house in multiple occupation’.” Scotland has no single national occupier number that decides planning permission, because the Scottish Government says “The formation of a HMO will not always require planning permission.” Northern Ireland treats HMO use as outside the normal use classes, so Belfast’s practical rule is that “All new HMOs must have planning permission and building control approval.”

What are permitted development rights?

Permitted development rights are planning permission already granted by legislation, so a qualifying change of use or building work can proceed without a planning application. GOV.UK defines them directly: “Permitted development rights are a national grant of planning permission which allow certain building works and changes of use to be carried out without having to make a planning application.” The General Permitted Development Order is the legislation that grants those rights in England, but it does not mean every house, flat or HMO conversion is automatically allowed: the right must cover the exact development, the property must meet the conditions, and the right must not have been removed by an Article 4 direction or planning condition. Scotland uses the same concept of PDR, with the Scottish Government describing them as development “granted planning permission through legislation,” while Wales and Northern Ireland have their own planning legislation and orders rather than simply following England’s Class L HMO rule.

Do permitted development rights apply to flats?

Permitted development rights can apply to flats for some changes of use, but ordinary householder permitted development rights for physical extensions and alterations usually do not apply to flats. In England, the GPDO definition says “dwellinghouse”, except in Part 3 changes of use and a few other Parts, “does not include a building containing one or more flats, or a flat contained within such a building,” which is why a flat owner should not assume house-style permitted development rights apply. Wales gives the same practical warning: “the permitted development rights which apply to many common projects for houses do not apply to flats.” The important HMO point is that England’s C3-to-C4 Class L right sits in Part 3 changes of use, so the flat question is not answered by the householder-extension rule alone. Scotland is different again, because Scottish guidance says “Specific PDR for flats (or tenements) are contained within” particular classes.

What is an Article 4 direction, and what does it change for HMOs?

An Article 4 direction removes a specified permitted development right in a defined area, so in England it can turn a C3-to-C4 small-HMO conversion from permitted development into a planning-application case. GOV.UK says an Article 4 direction “enables the Secretary of State or the local planning authority to withdraw specified permitted development rights across a defined area,” and it also says the effect is that “a particular development cannot be carried out under permitted development and therefore needs a planning application.” That means Article 4 HMO controls do not ban HMOs outright: you can have an HMO in an Article 4 area if planning permission is granted, or if the HMO use was already lawful before the direction took effect. The key protection for existing HMOs is that “Article 4 directions cannot prevent development which has been commenced, or which has already been carried out.” Wales needs permission for C3-to-C4 anyway, while Northern Ireland council Article 4 directions need Department approval.

How do you check whether permitted development rights have been removed?

You check whether permitted development rights have been removed by checking the local planning authority’s Article 4 maps, the property’s planning history and conditions, and, in England and Wales, the local land charges record where relevant. GOV.UK states the basic rule: “Permitted development rights can be removed by the local planning authority, either by means of a condition on a planning permission, or by means of an article 4 direction.” For an Article 4 direction, the English GPDO requires the council notice to “name a place where a copy of the direction, and a copy of a map defining the area to which it relates” may be inspected, so the map and wording matter more than a general web summary. England’s national planning.data.gov.uk Article 4 dataset is useful but not complete; it warns that “The data may be incomplete and not yet cover all of England.” A cautious HMO buyer checks the council first, not just a national map.

What is a certificate of lawfulness for existing use?

A certificate of lawfulness for existing use is a formal planning certificate confirming that an existing use, such as an HMO use that began before an Article 4 direction, is lawful at the date of the application. In England and Wales, section 191 lets a person apply to establish whether “any existing use of buildings or other land is lawful,” and if the authority is satisfied, “they shall issue a certificate to that effect.” Its value is evidential, not discretionary: “The lawfulness of any use, operations or other matter for which a certificate is in force under this section shall be conclusively presumed.” That is why landlords often use a certificate of lawful existing use to prove an HMO already existed before a new Article 4 direction came in, especially where the council is unclear about what counted as an HMO historically. In England, Planning Portal lists an existing-use certificate fee of £309 for one category, while a proposed-use certificate is normally half the equivalent planning fee.

Do you need planning permission to split one bedroom into two?

You normally do not need planning permission merely to split one bedroom into two with an internal wall, because interior-only works are not usually planning development, but building regulations, HMO room standards and listed-building consent may still matter. England and Wales planning law excludes works that “affect only the interior of the building” from development, and Planning Portal says: “You should not need to apply for planning permission for internal alterations including building or removing an internal wall.” Scotland and Northern Ireland use the same broad concept for interior-only alterations. The planning answer changes if the works are part of a wider material change of use, external alteration, subdivision into separate dwellings, or listed-building work; Planning Portal warns that in a listed building “you will need listed building consent for any significant works whether internal or external.” In England and Wales, the current building-regulations regime is the Building Regulations 2010, not the older 2000 Regulations still cited on some pages.

Can you split a house into two separate houses?

Splitting one house into two separate houses normally needs planning permission in England, Wales, Scotland and Northern Ireland, because using one dwellinghouse as two or more dwellinghouses is itself a material change of use. The England and Wales rule says “the use as two or more separate dwellinghouses of any building previously used as a single dwellinghouse involves a material change in the use of the building,” and Scotland and Northern Ireland have equivalent wording. Planning Portal puts the practical point bluntly for England: “To subdivide a house into multiple units you must obtain planning permission.” This is different from turning a single family house into one shared HMO, because a split into two houses creates separate planning units, separate services, separate access and often building-regulations, council tax, utilities and title issues. For England from 1 April 2026, the published planning-fee schedule gives “£610 for each additional dwellinghouse” where the change of use creates fewer than 10 dwellinghouses.

How do you turn a house into an HMO, and in what order?

The usual order for turning a house into an HMO is planning first, then building-regulations and fire-safety design, then the HMO licence before letting rooms, but that sequence is common practice rather than a UK-wide statutory timetable. In England, the first planning question is whether the proposal is C4, meaning “Use of a dwellinghouse by not more than six residents as a ‘house in multiple occupation’,” or a larger sui generis HMO; C3-to-C4 is Class L permitted development unless Article 4 has removed it. Wales does not have that C3-to-C4 permitted-development route, Northern Ireland treats HMOs as sui generis, and Scotland depends on whether the change is material locally. Licensing is a separate control: in England mandatory licensing applies where the HMO is occupied by “5 or more persons, from 2 or more separate households,” Wales keeps a three-storey test for mandatory licensing, Northern Ireland says “Every house in multiple occupation (‘HMO’) must be licensed,” and Scotland may refuse to consider an HMO licence within 21 days if the use would breach planning control. Abodient can store the HMO licence, fire certificates and compliance expiries against each property, which matters because planning lawfulness and licensing renewal dates are separate risks.

Can you turn an HMO back into a family home?

You can usually turn a small HMO back into a family home more easily than creating one, because England and Wales both grant a C4-to-C3 permitted-development route, while Scotland and Northern Ireland depend on their own planning and licensing systems. England’s Class L permits change “from a use falling within Class C4 (houses in multiple occupation) … to a use falling within Class C3 (dwellinghouses),” and Wales has the same one-way Class H right from C4 HMO to C3 dwellinghouse. That does not let you split the former HMO into two or more homes: England’s Class L excludes use “as two or more separate dwellinghouses.” The HMO licence position is separate from planning; in England and Wales a licence can continue even if the HMO later ceases to be licensable, because the Act says that applies “even if, at any time during that period, the HMO concerned subsequently ceases to be one to which this Part applies.” Ask the council to revoke or vary it if the HMO use has genuinely ended.

Can neighbours object to or stop an HMO?

Neighbours can object to an HMO only where there is a planning application or, in Scotland and Northern Ireland, through wider HMO-licence representation rules; in England and Wales they do not get a general neighbour veto over an HMO licence. In England, a C3-to-C4 small HMO may be permitted development, so there may be no planning application to object to unless Article 4 applies or the proposal is a large HMO. Where there is a planning application, the formal consultation period “will normally last for 21 days,” but even statutory consultees “may recommend that a planning application be refused but cannot in most cases direct that this happens.” For England and Wales HMO licensing, the statutory notice category is relevant persons such as “a person having an estate or interest in the HMO,” not ordinary neighbours next door. Scotland is the major exception: its HMO guidance says “The 2006 Act permits any person to make an objection to a licence application.” Northern Ireland councils publish HMO licence notices for 28 days for representations.

Last reviewed September 2026.

Sources

• Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 3, Class L — “from a use falling within Class C3 (dwellinghouses) of the Schedule to the Use Classes Order, to a use falling within Class C4 (houses in multiple occupation) of that Schedule.” Source
• Town and Country Planning (Use Classes) Order 1987, Schedule — “Use of a dwellinghouse by not more than six residents as a ‘house in multiple occupation’.” Source
• GOV.UK, Houses in multiple occupation and planning control in Scotland — “The formation of a HMO will not always require planning permission.” Source
• Belfast City Council, Applying for a HMO licence — “All new HMOs must have planning permission and building control approval.” Source
• GOV.UK, When is permission required? — “Permitted development rights are a national grant of planning permission which allow certain building works and changes of use to be carried out without having to make a planning application.” Source
• Scottish Government, Circular 2/2024: non-domestic permitted development rights — “Permitted development rights (‘PDR’) refer to those forms of development which are granted planning permission through legislation, meaning they can be carried out without a planning application having to be submitted to (and approved by) the local authority.” Source
• Town and Country Planning (General Permitted Development) (England) Order 2015, article 2 — “‘dwellinghouse’, except in Part 3 (changes of use) … does not include a building containing one or more flats, or a flat contained within such a building.” Source
• Welsh Government, Planning permission: flats and maisonettes — “Bear in mind that the permitted development rights which apply to many common projects for houses do not apply to flats.” Source
• Scottish Government, Circular 1/2024: householder permitted development rights — “Specific PDR for flats (or tenements) are contained within the following classes, which are explained below:” Source
• GOV.UK, When is permission required? — “An article 4 direction is a direction under article 4 of the General Permitted Development Order which enables the Secretary of State or the local planning authority to withdraw specified permitted development rights across a defined area.” Source
• GOV.UK, When is permission required? — “An article 4 direction only means that a particular development cannot be carried out under permitted development and therefore needs a planning application.” Source
• GOV.UK, When is permission required? — “Article 4 directions cannot prevent development which has been commenced, or which has already been carried out.” Source
• Town and Country Planning (General Permitted Development) Order 1995, Wales Class H as made by WSI 2016/29 — “Development consisting of a change of use of a building to a use falling within Class C3 (dwellinghouses) of the Schedule to the Use Classes Order from a use falling within Class C4 (houses in multiple occupation) of that Schedule.” Source
• Planning (General Permitted Development) Order (Northern Ireland) 2015, article 4 — “Subject to paragraph (4), a direction by a council under this Article shall require the approval of the Department who may approve the direction with or without modifications.” Source
• GOV.UK, When is permission required? — “Permitted development rights can be removed by the local planning authority, either by means of a condition on a planning permission, or by means of an article 4 direction.” Source
• Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 3 — “name a place where a copy of the direction, and a copy of a map defining the area to which it relates, or the site to which it relates, as the case may be, may be seen at all reasonable hours.” Source
• Planning.data.gov.uk, Article 4 direction area dataset — “The data may be incomplete and not yet cover all of England.” Source
• Town and Country Planning Act 1990, section 191 — “any existing use of buildings or other land is lawful.” Source
• Town and Country Planning Act 1990, section 191 — “they shall issue a certificate to that effect.” Source
• Town and Country Planning Act 1990, section 191 — “The lawfulness of any use, operations or other matter for which a certificate is in force under this section shall be conclusively presumed.” Source
• Planning Portal, Lawful Development Certificate — “Existing use or operation: lawful not to comply with any condition or limitation £309.” Source
• Town and Country Planning Act 1990, section 55 — “affect only the interior of the building.” Source
• Planning Portal, Internal walls: planning permission — “You should not need to apply for planning permission for internal alterations including building or removing an internal wall.” Source
• Planning Portal, Internal walls: planning permission — “If you live in a listed building, however, you will need listed building consent for any significant works whether internal or external.” Source
• Planning Portal, Internal walls: building regulations — “If you wish to build a new internal wall, remove an internal wall, or form an opening in an internal wall, building regulations will normally apply.” Source
• Town and Country Planning Act 1990, section 55 — “the use as two or more separate dwellinghouses of any building previously used as a single dwellinghouse involves a material change in the use of the building and of each part of it which is so used.” Source
• Planning Portal, Convert house to flats — “To subdivide a house into multiple units you must obtain planning permission.” Source
• Planning fees: annual indexation from 1 April 2026 — “where the change of use is to use as fewer than 10 dwellinghouses, £610 for each additional dwellinghouse.” Source
• GOV.UK, HMO licensing reform guidance — “For mandatory licensing to apply, the HMO (or Flat in Multiple Occupation) must be occupied by 5 or more persons, from 2 or more separate households.” Source
• Licensing of Houses in Multiple Occupation (Prescribed Descriptions) (Wales) Order 2006, article 3 — “the HMO or any part of it comprises three storeys or more.” Source
• Houses in Multiple Occupation Act (Northern Ireland) 2016, section 7 — “Every house in multiple occupation (‘HMO’) must be licensed under this Act (unless a temporary exemption notice under section 15 is in effect in respect of it).” Source
• Private Rented Housing (Scotland) Act 2011, section 13 — “The local authority may, within 21 days of an application for an HMO licence, refuse to consider the application if it considers that occupation of the living accommodation concerned as an HMO would constitute a breach of planning control.” Source
• Town and Country Planning (General Permitted Development) (England) Order 2015, Class L — “from a use falling within Class C4 (houses in multiple occupation) of the Schedule to the Use Classes Order, to a use falling within Class C3 (dwellinghouses) of that Schedule.” Source
• Town and Country Planning (General Permitted Development) (England) Order 2015, Class L limitation — “as two or more separate dwellinghouses falling within Class C3 (dwellinghouses) of the Schedule to the Use Classes Order of any building previously used as a single dwellinghouse falling within Class C4 (houses in multiple occupation) of that Schedule.” Source
• Housing Act 2004, section 68 — “even if, at any time during that period, the HMO concerned subsequently ceases to be one to which this Part applies.” Source
• GOV.UK, Consultation and pre-decision matters — “The formal consultation period will normally last for 21 days, and the local planning authority will identify and consult a number of different groups.” Source
• GOV.UK, Consultation and pre-decision matters — “A statutory or non-statutory consultee may recommend that a planning application be refused but cannot in most cases direct that this happens.” Source
• Housing Act 2004, Schedule 5 — “a person having an estate or interest in the HMO or Part 3 house in question.” Source
• Scottish Government, Licensing of houses in multiple occupation: statutory guidance — “The 2006 Act permits any person to make an objection to a licence application.” Source
• Belfast City Council, Northern Ireland Houses in Multiple Occupation — “Where a notice of application for a HMO licence has been received, the council will publish such notice on the Council website for a period of 28 days to allow representation to be made.” Source