Southampton HMO Room Size Requirements: Local Minimums Explained
Southampton sets HMO room sizes higher than the national statutory minimums. A single bedroom that would pass at 6.51 square metres under the Housing Act 2004 needs to be at least 10 square metres in Southampton — unless the property provides a separate communal lounge. These local standards are set out in the council's Guidance on HMO Standards 2025 and enforced through licence conditions.
Bedroom Minimums
| Room type | National minimum | Southampton minimum | Southampton minimum with separate lounge |
|---|---|---|---|
| Single bedroom (one person over 10) | 6.51 m² | 10.00 m² | 6.51 m² |
| Double bedroom (two people / couple over 10) | 10.22 m² | 14.00 m² | 10.22 m² |
| Child's bedroom (under 10) | 4.64 m² | 10.00 m² | 4.64 m² |
| Bedsit (one-room unit, one occupant) | — | 10.00 m² | — |
| Bedsit (one-room unit, cohabiting couple) | — | 14.00 m² | — |
| Bedsit bedroom (two-room unit, one occupant) | 6.51 m² | 6.51 m² | — |
Two things to note about how floor area is measured. Any part of the room with headroom below 1.5 metres is excluded — this matters in attic conversions. En-suite bathrooms are also excluded from the usable bedroom area.
The gap between the national and Southampton minimums is significant. A landlord converting a three-bedroom house into a shared let might assume that every bedroom over 6.51 square metres qualifies. In Southampton, unless there is a separate lounge that occupants can use as communal living space, the bedrooms need to hit 10 square metres each. A room at 8 square metres that would be legal in many other cities fails here.
Kitchen Standards
Southampton's kitchen requirements scale with occupancy:
Up to 5 occupants: One standard cooker (four rings, oven and grill), one sink with drainer, at least 1.0 square metre of usable worktop space (or 0.2 square metres per person, whichever is greater; do not count space occupied by a microwave), a standard 0.15 cubic metre fridge and a separate standard freezer per five occupants, at least one worktop socket per occupant (minimum four), and one 400mm wall unit or equivalent for dry food storage per person. The kitchen should be at least 7 square metres; a smaller floor area may be acceptable for a property occupied by three or four people if all kitchen facilities can be used safely.
6 to 7 occupants: Everything above, plus a microwave oven. PAT testing is one way to check appliance safety; suitable RCD protection is an alternative under the guidance. Kitchen area at least 8 square metres.
8 to 10 occupants: Two complete cookers and two sinks (or one sink plus a full-sized dishwasher). The minimum kitchen area is 9 square metres for 8 or 9 occupants and 10 square metres for 10 occupants.
Kitchens should be no more than one floor away from users. This does not apply if a communal living or dining space is on the same floor as the users, or is no more than one floor away from the kitchen.
Bathroom Ratios
The baseline ratio is one shared bathroom (containing a bath or shower, toilet and wash hand basin) per five occupants. Bathrooms must not be more than two floors away from any bedroom in shared houses, or more than one floor in bedsits.
For individual room tenancies, Southampton's guidance requires a wash hand basin with hot and cold water in each bedroom where reasonably practicable; the landlord must show when this is not reasonably practicable. In joint-tenancy shared houses, bedroom basins are not required, though the council recommends them where practicable.
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Fire Safety
Every HMO needs interlinked, mains-wired smoke alarms along all escape routes and in communal living rooms, with heat detectors in rooms containing cooking facilities. Bedsits require FD30 fire doors with self-closers. In one- or two-storey shared houses, sound timber doors are acceptable if escape routes are protected.
Exit and bedroom doors must open from the inside without a key; Southampton's guidance gives thumb-turns and snibs as examples. Padlocks or sliding bolts on the outside of bedroom doors are unacceptable. Rooms with cooking facilities need a wall-mounted fire blanket conforming to BS 7944:1999 or BS EN 1869:1997, positioned away from the cooker. Where escape routes lack natural or borrowed light, emergency lighting may be needed; any system provided must operate for at least one hour.
Why This Matters at Application
The council checks these standards during the licensing inspection (or your independent surveyor checks them if you take the discounted route). Rooms below minimum sizes cannot be used as sleeping accommodation — the council will set a maximum occupancy condition on the licence that reflects the actual room sizes, not what you intended.
If two bedrooms in a five-person HMO fall below 10 square metres and there is no separate lounge, the licence might cap occupancy at three. That changes the financial viability of the property.
For a room-by-room assessment checklist and the full amenity standards, see our Southampton landlord licensing guide.
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