An HMO conversion caught by an Article 4 direction

An article 4 hmo application becomes necessary the moment a council removes the permitted development right to change a dwellinghouse in Class C3 to a small house in multiple occupation in Class C4. Without a direction, that change of use is permitted development for a property occupied by three to six unrelated people sharing facilities. With one, it is a full planning application decided against the council's amenity, parking and concentration policies.

What follows is illustrative rather than a record of a particular case. The figures are illustrative.

The property and the intended conversion

A three bedroom Victorian terrace close to a university campus, bought at auction. The intention was five letting rooms: the three existing bedrooms, the rear reception converted, and the box room retained, with a shared kitchen and diner in the rear extension and one additional shower room.

The investor's appraisal assumed no planning application. A five person HMO falls within Class C4, the change from C3 to C4 is permitted development under the General Permitted Development Order, and the works were internal.

Two of those three assumptions were correct.

Discovering the direction after purchase

The council had made an article 4 direction covering a defined area around the campus, removing the C3 to C4 permitted development right. The direction had been in force for several years, it was published on the council's website, and the area it covered included the street.

Nothing about that appears in a standard conveyancing search in a way that an investor skimming a report would notice. An article 4 direction does not attach to the title. It is a planning constraint, and finding it means looking at the council's planning policy pages or its constraint mapping.

A direction does not remove the right to occupy a house as a family home, and it does not make an existing lawful HMO unlawful. It removes the right to change the use without permission from the date it takes effect. Where a direction is made without twelve months' notice, there can be a liability to compensate for withdrawn rights, which is why most authorities give the notice period and make the direction take effect later.

The practical consequence here was an application, a fee, an eight week determination period the council did not meet, and a purchase priced on the assumption that none of that would be needed.

What permission was then required

A full planning application for change of use from C3 to C4. Not a certificate, and not prior approval.

Two adjacent points were checked at the same time. Seven or more sharers takes the property out of C4 into a sui generis large HMO, which always needs permission regardless of any direction. And the works themselves were internal and did not affect the external appearance, so no separate application was needed for them, although a new soil stack or an extract terminal would have changed that.

Licensing is separate again. Mandatory licensing applies to HMOs occupied by five or more people forming two or more households, and additional licensing schemes extend that in many areas. A licence is not planning permission and planning permission is not a licence, and the two teams apply different standards to the same rooms.

Amenity, bin storage and cycle parking evidence

Councils with HMO directions almost always have an adopted standard or a supplementary planning document setting out what they expect. Reading it first saved a refusal here.

The recurring requirements are room sizes, communal space, kitchen provision, bathroom ratios, outside amenity space, bin storage and cycle parking. Room sizes are where planning and licensing can differ, and the safe approach is to design to whichever is larger.

For licensing, the mandatory conditions set minimum sleeping room sizes, with 6.51 square metres for one person over ten years old and 10.22 square metres for two. Planning policies often require more, and many require a minimum communal living area sized by the number of occupants. The box room in this property was 6.9 square metres, which passed the licensing minimum and failed the council's planning standard, so it became a store.

Bin storage decided more of the application than anything internal. Five sharers generate more refuse than a family, collections are weekly or fortnightly, and a terrace with no rear access means bins are stored in the front garden and dragged through the house or left on the pavement. The scheme provided a screened store in the front garden sized for the council's own containers, drawn to scale, with the collection point marked.

Cycle parking followed the same logic: a secure, covered store in the rear yard, accessible without carrying a bicycle through the kitchen.

All of this went into the Design and Access Statement with a room by room schedule showing each area against the adopted standard.

The parking stress survey

The council's policy allowed refusal where a conversion would worsen on-street parking in an area already under pressure. The property had no off-street parking and the street had unrestricted parking on both sides.

A parking stress survey was commissioned using the established overnight methodology: counts of available kerb space and parked vehicles within a defined walking distance of the site, carried out overnight on a midweek night and a weekend night, outside school and university holidays, repeated so that a single unrepresentative night could not decide the result.

Two things matter about that method. The survey area has to be measured and justified, usually a walking distance from the site, and the available kerb length has to be calculated properly by deducting dropped kerbs, junctions and restrictions rather than measured as raw frontage. A survey that inflates the denominator is easy for an officer to dismiss.

The result showed stress below the level at which the council's policy engaged, and the Parking Survey was submitted with the raw counts appended rather than only the conclusion. Objectors produced their own observations, as they usually do, and the raw data was what allowed the officer to prefer the survey.

The decision and the conditions imposed

Permission was granted at delegated level after fourteen weeks, with four conditions: occupation limited to no more than five persons, the bin and cycle stores to be provided before first occupation and retained, the box room not to be used as sleeping accommodation, and a management plan for refuse presentation to be submitted and approved.

The occupancy condition is the one to read carefully. A limit on the number of persons, rather than on the use class, means expanding later requires a further application even within C4. Investors sometimes accept a number lower than the property could hold because it is offered late in the process and the deal is waiting.

Total delay against the original programme was roughly four months, plus the application fee and the survey cost. The property still worked, on a lower return than the auction appraisal assumed. That is the usual outcome rather than a disaster, and it is why the checks matter more than the mitigation.

Checks to make before the next purchase

Five minutes of work, done before bidding, removes most of this risk.

1. Check the council's article 4 direction register and its constraint mapping for the address, not the ward.
2. Check whether an additional or selective licensing scheme covers the street, and what it requires.
3. Read the adopted HMO amenity standards and measure the property against them from the floor plan in the particulars.
4. Check any concentration policy, which typically refuses further HMOs where a stated proportion of properties within a radius are already in that use, and ask the council for the current figure for the street.
5. Check whether the street is in a controlled parking zone, because a zone can remove the parking objection and can also remove the right of new occupants to obtain permits.

Point four is the one that kills schemes outright. Where a concentration threshold is already exceeded, no amount of amenity or parking evidence will secure permission, and the property is worth what it is worth as a family home.

Set the case out in a Planning Statement that deals with the direction, the standards and the concentration policy in that order. For a scheme with commercial space below, the additional issues are covered in a mixed use walkthrough with retail below flats.

This is general guidance, not legal advice, and this walkthrough is illustrative rather than a record of a real application. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Enter your postcode on PlanScope to see which reports a conversion like this is likely to need.