Sui generis HMO (7+ occupants)

You can need planning permission without needing a licence, or need a licence with planning already settled — or need both. Mixing the tests causes expensive mistakes.

Under the Town and Country Planning (Use Classes) Order framework as commonly applied in England, C4 covers many small HMOs; larger HMOs fall outside C4 into sui generis. Exact resident counts and definitions belong in the Order and case-specific advice (legislation.gov.uk Use Classes materials — confirm the live instrument your adviser cites). AgentHMO does not certify your use class.

Even for C4-sized HMOs, Article 4 directions can remove permitted development rights for C3→C4 changes (Article 4 areas; GOV.UK — when is permission required). Sui generis HMOs typically need express planning permission for the change of use — do not assume PD rights.

A 7-person HMO will usually meet the GOV.UK large HMO licensing test in England/Wales if households and shared facilities align (GOV.UK — HMO licence; licence threshold guide). Amenity and fire expectations rise with headcount (council amenity rules · fire regs · fire-door spec). Occupancy tool: occupancy calculator. Room sizes: SI 2018/616.

1. Planning history and any existing permission
2. Article 4 map
3. Pre-app with the planning authority if unsure
4. Licensing scheme and amenity PDF for that occupancy
5. Fire risk assessment suited to the layout
6. Mortgage / insurance ability to lend or cover sui generis HMO use (ask providers — not advice from us)

Buying path: how to buy. Conversion talk: converting to HMO.

Planning application fees and licence fees are separate local/national schedules. Licence pounds: fee ranges. Any “typical 8-week” claim without a named authority decision notice is not confirmed.

Larger licensed HMOs trade on income evidence and lawful use (income-based sale · free valuation). Missing sui generis permission is a classic buyer snag. Pack planning and licence together (sale legal pack).

Scotland / Wales / NI planning and licensing labels differ. Scotland HMO licensing: Scotland licensing. Do not export “C4 vs sui generis” slang unchanged.

Larger HMOs attract parking, noise and waste objections at planning. Pre-app advice and a management plan (waste, gardens, quiet hours) sometimes help — they do not guarantee consent. Document what you propose to operate, not only what you hope to earn (management help).

Some residential HMO products stop at six occupants or exclude sui generis planning use. Confirm with a broker authorised by the FCA and your insurer before you commit to a seven-room refurb (HMO mortgages · HMO mortgage calculator — illustrative only). AgentHMO does not place cover or loans.

Adding a seventh lettable room can change detection grades, door schedules and emergency lighting needs (HMO emergency lighting · HMO fire doors). Budget a fresh fire risk assessment when you cross planning and licensing thresholds.

Occupier type does not rewrite use class by itself, but councils and neighbours react differently to term-time peaks. Licensing still turns on households and facilities. Keep marketing claims aligned with the permission you actually hold.

• GOV.UK — when is permission required
• Use Classes Order materials on legislation.gov.uk
• GOV.UK — HMO licence
• Housing Act 2004

Confirm every planning decision notice against the occupancy you intend to market — consent for six is not consent for eight.

1. Count intended adults and households.
2. Ask whether the use is C4-sized or larger / sui generis in planning terms for your authority.
3. Check Article 4 and existing permissions.
4. Run the GOV.UK large-HMO licensing test and local additional schemes (Do I need an HMO licence?).
5. Commission fire and amenity gap analysis for that headcount.
6. Only then price works and finance.

Skipping straight to “seven en-suites maximise yield” inverts the sequence. Yield language without lawful use is marketing fiction (HMO yield explained).

Billing treatment can differ for HMOs versus single dwellings depending on facts and local practice (HMO council tax). Confirm with the billing authority — not with a seminar slide.