Document bundle for a house to small HMO conversion

Converting a house to a small shared house for three to six unrelated occupiers is a change from use class C3 to use class C4, and across most of England that change is permitted development under Part 3 Class L of the General Permitted Development Order. Where an Article 4 direction is in force, the right is withdrawn and you need a full planning application. So the first question is not what documents you need. It is whether a direction covers the street.

Check that before you spend anything, because the answer changes the whole exercise.

Whether permission is needed at all

The Use Classes Order puts small houses in multiple occupation in class C4: a dwelling occupied by between three and six unrelated individuals sharing basic amenities such as a kitchen or bathroom. Seven or more occupiers falls outside the class system altogether and is sui generis, which always needs planning permission.

Class L of Part 3 permits a change of use from C3 to C4 and back again. Two conditions on that right matter. It does not apply where an Article 4 direction has removed it, and it does not authorise any building work, so a rear extension or a loft conversion to create the extra rooms needs its own permitted development assessment or permission.

Licensing is a separate regime and it is not affected by any of this. Mandatory licensing under the Housing Act 2004 applies to HMOs occupied by five or more people forming two or more households, and many councils operate additional licensing schemes covering smaller properties. A licence is not planning permission and planning permission is not a licence.

Article 4 directions and how to check

Directions withdrawing the C3 to C4 right are now common in university towns and in parts of cities with high concentrations of shared housing. They vary in three ways that change your answer completely.

Geography: some cover a whole district, others only named wards or defined streets. Scope: most remove only the C3 to C4 right, though a few also remove householder rights. Date: a direction takes effect on a stated date, usually at least twelve months after it is made, and uses established before that date are unaffected.

Find the direction itself rather than a summary. Councils publish directions on their planning policy pages with a map and the confirmed date. Read the map at street level, because boundaries follow property lines rather than road centrelines in places.

One useful point of procedure. Where an application is required only because an Article 4 direction has removed a permitted development right, the fees regulations provide for no fee to be payable. Confirm it with the council's validation team when you submit, since they apply the exemption.

Room sizes and amenity evidence

Two separate sets of standards apply, and conflating them is the commonest error in these applications.

Licensing sets mandatory minimum sleeping room sizes: 6.51 m² for one person aged over ten, 10.22 m² for two people aged over ten, and 4.64 m² for one child under ten. Those are conditions of a licence under the 2018 mandatory conditions regulations, enforced by the housing team.

Planning standards are local. Many authorities adopt an HMO supplementary planning document with minimum room areas, minimum communal space per occupier, kitchen worktop and appliance provision scaled to occupancy, and bathroom ratios such as one WC and washbasin per a stated number of occupiers. The nationally described space standard does not apply, because it is written for self-contained dwellings.

What to submit: existing and proposed floor plans at 1:50 or 1:100 with every room labelled by use and annotated with its floor area in square metres, a schedule listing each bedroom with its area and intended occupancy, and the communal living space area with the occupancy it serves. Where the plan relies on a room being a bedroom rather than a study, say so on the drawing. Officers assume the maximum.

Refuse and cycle storage provision

Shared houses generate more waste per property than family houses, with no shared management arrangement and more frequent tenant turnover. Refuse provision is the single most common reason a small HMO application attracts conditions, and sometimes a refusal.

Show the bins on the proposed site plan, to scale, with the container sizes your council actually uses and the number of each. Show how they are moved to the collection point and how far that is. Where the frontage is too small for the bins to sit out of view, an enclosure with a gate and a hard surface is the usual answer, and it needs to be on the drawing rather than promised in a statement.

Cycle parking follows the same logic: secure, covered, accessible without carrying a bicycle through a habitable room, and one space per bedroom unless the local standard says otherwise.

Councils with a published HMO design guide tend to set these figures precisely. In a conservation area the enclosure design itself becomes a heritage question, and the documents for an application in a conservation area cover that additional layer.

Parking stress evidence

Where the council's concern is on-street parking, the way to answer it is a survey rather than an argument.

A Parking Survey to the Lambeth methodology counts kerbside occupancy along defined street lengths within a stated walking distance of the site, on at least two separate occasions during the overnight period when residential demand peaks, outside school holidays and avoiding unusual events. The output is a stress percentage: occupied spaces as a proportion of available capacity.

The figure that matters is whether there is spare capacity after the proposal. A result in the eighties leaves room for argument. Above the mid nineties, the council will treat the street as effectively full.

Three details decide whether the survey is accepted. The extent of streets surveyed has to match the council's stated catchment, usually 200 metres. The capacity calculation has to apply a realistic vehicle length and deduct dropped kerbs, junction protection and controlled lengths. And the survey dates have to be neutral, which means term time in a university area rather than August.

Noise and neighbour amenity material

Objections to small HMOs cluster on noise, comings and goings, and the cumulative character of a street. Only some of that is a material planning consideration.

Noise from the use of a dwelling is a legitimate consideration in design terms, and the practical answer is layout: habitable rooms not stacked over neighbouring bedrooms, no bedroom directly against a party wall where it can be avoided, communal living space at the front rather than against a rear boundary. Where a council has adopted a concentration policy, expressed as a percentage of HMOs within a defined radius, you need the council's own data on existing HMOs in that radius, which licensing records usually provide on request.

A management plan covering waste, noise, maintenance and a named contact is not a statutory document, and officers read it anyway. Keep it to two pages and make the commitments ones a condition could enforce.

The bundle, and what it is not

For a C3 to C4 conversion in an Article 4 area, the realistic submission is:

1. Application form and location plan at 1:1250 with the site edged red
2. Existing and proposed floor plans with room areas and a bedroom schedule
3. A site plan showing refuse and cycle storage to scale
4. A short Planning Statement covering the Article 4 position, the amenity standards, waste and cycle provision, parking and the concentration policy if one applies
5. A parking survey where the council's standards or an officer's pre-application response ask for one
6. A management plan, offered rather than required

What you do not need, in almost every case, is a design and access statement, a transport assessment, a flood risk assessment or an ecology report. Those arrive with extensions, new build and larger sui generis schemes. Adding them signals that the application was assembled from a generic checklist rather than from the council's validation list, which is the document that governs.

Browse the report types to see which of these your scheme needs, and check the council's own validation checklist alongside it.

This is general guidance, not legal advice; 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.