Westminster HMO Room Sizes: Minimum Bedroom Standards and Measurement Rules

Room sizes in a Westminster HMO are not advisory — they are mandatory licence conditions backed by the same enforcement powers as the licence itself. Letting a bedroom that falls below the statutory minimum is a licence breach that can trigger a civil penalty of up to £40,000 for offences committed on or after 1 May 2026; the previous cap was £30,000.

The Statutory Minimums

These floor areas come from the Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018 and apply to Part 2 HMO licences in Westminster:

Any room measuring less than 4.64 m² cannot be used as a bedroom at all, regardless of how it is described in the tenancy agreement or marketed on a listing.

How Floor Area Is Measured

The usable floor area calculation excludes any part of the room where the ceiling height is below 1.5 metres. This particularly affects top-floor rooms, loft conversions and rooms with sloping ceilings or eaves — common in Victorian and Edwardian conversions across Westminster.

A room that measures 8 m² overall but has 2 m² of floor space under a sloped ceiling below 1.5 metres has a usable area of just 6 m². That fails the single adult minimum of 6.51 m² and cannot be used as a bedroom.

Your floor plans, which are uploaded as part of the licence application, must show room dimensions in square metres and indicate where ceiling heights drop below the threshold.

Shared Facility Ratios

Westminster also enforces amenity ratios for shared kitchens and bathrooms:

Kitchens: One complete set of kitchen facilities for every five occupants. A full set means an oven and grill, at least four hob rings (two acceptable for single-occupancy studios), a sink and drainer with hot and cold water, food storage units, a refrigerator and sufficient power sockets.

Bathrooms: One bathroom (bath or shower, wash hand basin and toilet) for every five occupants. Where five or more people share the main bathroom, a separate WC with wash hand basin is also required.

The 18-Month Grace Period

At renewal of a Part 2 HMO licence, if a licence holder does not meet a room-size condition, the council must notify them and allow a period of up to 18 months to comply. This means reducing the number of occupants in undersized rooms or reconfiguring room layouts to meet the standards. This is a renewal transition, not a general grace period for new applications.

The grace period is not an excuse to ignore room sizes. It is a transitional mechanism that acknowledges structural changes take time. During this period, the council may impose specific licence conditions about which rooms can and cannot be used as bedrooms and what occupancy level is permitted.

Westminster's Discretionary Powers

Beyond the national statutory minimums, the council can use its discretionary powers under the Housing Health and Safety Rating System (HHSRS) to demand larger rooms or enhanced safety features based on a property-specific risk assessment. Granting a licence does not certify the property as free from HHSRS hazards — the council can issue improvement notices for hazards like excess cold, dampness or fire safety deficiencies regardless of the property's licence status.

For a printable room measurement worksheet and the full amenity ratio checklist, the Westminster Landlord Licensing Guide covers every physical standard your property needs to meet.

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