Which reports a large sui generis HMO needs

A house in multiple occupation for seven or more people is a sui generis use, so it always needs a full planning application. There is no permitted development route and no prior approval. The application pack for a large HMO is heavier than most landlords expect: a planning statement that deals with concentration policy, floor plans showing every room measured, parking and cycle evidence, a refuse strategy, and usually a management plan. Councils refuse these schemes on amenity and parking far more often than on the principle of shared housing.

Class C4 covers small shared houses occupied by between three and six unrelated people who share a basic amenity such as a kitchen or bathroom. Cross seven occupants and the Use Classes Order has nothing for you, which is the whole reason the submission looks different.

Why seven occupants falls outside Class C4

The Town and Country Planning (Use Classes) Order 1987, as amended, defines Class C4 by reference to the number of occupants as well as the sharing arrangement. Above that number the use is not in any class, and a use outside the classes needs express permission for the material change.

Two consequences follow. The permitted change between Class C3 and Class C4 under Schedule 2 Part 3 Class L of the General Permitted Development Order 2015 does not reach a seven-bed scheme, so it makes no difference whether an Article 4 direction has been made in your area. And the authority can impose conditions on occupancy, management and bin storage that would not be available on a prior approval.

Count occupants, not bedrooms. A six-bedroom house where one room is let as a double is a seven-person HMO in planning terms, and officers do read the room schedule that way.

Concentration policies and how they are evidenced

Most urban authorities now operate a concentration or saturation policy for shared housing. The usual form sets a percentage of HMOs within a defined radius of the application property, and refuses further conversions above it. The radius and the percentage vary by authority and some use a street-frontage test instead, so read the adopted policy and any supplementary planning document rather than assuming the figure from a neighbouring council.

Evidencing your position takes a dated desk exercise. Plot every licensed HMO from the authority's public licensing register within the stated radius, record the total number of residential properties from the same source the policy uses, and show the calculation. Where the policy counts planning permissions rather than licences, search the authority's register of decisions instead. Set out the method so an officer can repeat it, because the officer will.

Where a site sits marginally over the threshold, the argument shifts to whether the character of the area has already changed and whether this proposal adds to any identified harm. That is an argument about street conditions, refuse on frontages, parking stress and anti-social behaviour records, all of which need sourced evidence rather than assertion.

Amenity, room size and communal space

The Nationally Described Space Standard applies to self-contained dwellings and does not govern HMO bedrooms. What does apply is licensing. The Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018 set national minimum sleeping room sizes of 6.51 m2 for one person aged over ten, 10.22 m2 where two people over ten share, and 4.64 m2 for a child under ten. Many authorities then set higher standards for planning purposes in an HMO supplementary planning document.

Communal space is where large schemes fail. A seven-person house with one 11 m2 kitchen-diner and no living room reads as a hostel rather than a home, and officers say so in refusal reasons. Show a kitchen with enough worktop, hob rings and fridge capacity for the number of occupants, and keep at least one separate communal room. Where a reception room has been converted to a bedroom, expect that to be the point the case turns on, and the issues are much the same as in a garage conversion to habitable accommodation.

Annotate the floor plans with internal areas for every room, including bathrooms and the communal spaces. Unmeasured plans invite a request for further information and lose you a fortnight.

Parking and cycle storage evidence

Large HMOs generate more car ownership per dwelling than a family house in the same street, and that is the authority's main practical concern. Most local standards express a requirement per bedroom or per occupant rather than per dwelling.

Where on-site parking cannot be provided, the answer is a parking stress survey using the Lambeth methodology: beat surveys of the available kerb space within an agreed walking distance, carried out overnight midweek and at a weekend, outside school holidays, with the occupancy accumulation presented as a percentage of capacity. Agree the survey extent and dates with the highway officer before you commission it. A survey the officer did not scope is a survey the officer can reject.

Cycle storage needs to be covered, secure and usable in practice, with one space per bedroom in most standards. A rack behind a side gate that requires carrying a bicycle through the kitchen will be treated as no provision at all. Where the scheme also triggers wider transport work, the trigger points are set out in our note on when a transport assessment becomes necessary.

Refuse and recycling provision

Seven occupants on separate shopping patterns produce more waste than a family of four, and bin presentation on the frontage is the single most visible neighbour complaint about HMOs.

Work out the container capacity from the collection authority's published allocation per property and per occupant, then show a storage area that holds it: dimensioned, screened, within the usual carry distance from the highway, and not across the front garden. A waste management strategy covering storage, collection day arrangements and who is responsible under the tenancy answers the officer's question directly. Set it out as a short standalone document for a scheme of this size.

Noise and management arrangements

Noise objections to HMOs are rarely about plant. They are about people, which planning policy handles through management rather than acoustics.

A management plan carries real weight here. Name the responsible manager and the response time for complaints, set out inspection frequency, describe how tenancies deal with noise and refuse, and explain how the garden and any parking area are controlled. Where a formal acoustic case is needed, it is usually about separating floors in a conversion rather than external noise, and that is a building regulations matter under Approved Document E as much as a planning one.

Where the property is in a flood risk area the shared-occupancy arrangement affects your flood response planning, since a sleeping-risk use with seven unrelated occupants needs a workable escape plan. The approach to that evidence follows the same pattern as housing proposals in Flood Zone 3a.

Fire safety and licensing alongside planning

Three regimes run in parallel and they are decided by different people. Planning permission handles the change of use and its external effects. Mandatory HMO licensing under the Housing Act 2004 applies to properties occupied by five or more people forming two or more households, and the licence conditions cover room sizes, amenities and management. Fire safety sits with the Regulatory Reform (Fire Safety) Order 2005 and, in a conversion, with building regulations.

A planning permission does not deliver a licence and a licence does not cure an unauthorised use. Apply for both, and do not let the licensing officer's standards drift into your planning drawings unchecked, since the two sets of requirements are not identical.

The Fire Statement required at Planning Gateway One does not apply to a converted house. It is engaged for relevant buildings of 18 metres or more, or seven storeys, under Article 9A of the Development Management Procedure Order 2015, so a three-storey terrace conversion is outside it.

Assembling the application

For a typical seven to nine person conversion the pack is a planning statement, existing and proposed floor plans and elevations with room areas annotated, a parking stress survey, a refuse and cycle storage plan, a management plan, and a waste management strategy. A design and access statement is required where the site is in a conservation area or the works affect a listed building. Browse the 66 report types grouped by category to scope anything the site constraints add, such as ecology where roof works affect bats.

Illustrative example: a 1900s mid-terrace with six bedrooms, a loft room added to make seven, no off-street parking, and one 12 m2 kitchen-diner. The scheme that gained permission removed the loft bedroom, reinstated a living room on the ground floor, and provided a dimensioned bin store with cycle parking in a side return. Three documents answered the three refusal reasons on the earlier scheme. That example is illustrative and not drawn from a specific decision.

Enter your postcode on PlanScope to see which reports a change of use on your property is likely to need, then send the drafts for professional review.

This is general guidance, not legal advice. Concentration policies, parking standards and licensing requirements differ by authority, so 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.