Hackney HMO Room Size Requirements and the 1.5m Headroom Rule

Minimum Bedroom Sizes

National law sets hard minimum floor areas for sleeping rooms in licensed HMOs. Hackney Council enforces these during inspections and when processing licence applications:

• Single occupant (aged 10+): 6.51 m²
• Two occupants (couple, both aged 10+): 10.22 m²
• Child under 10: 4.64 m²

Any bedroom measuring less than 4.64 m² cannot be used as a sleeping room under any circumstances. A room that falls below the relevant minimum for its intended occupancy means the council can refuse the licence or impose a condition limiting the number of occupants below what the landlord planned.

The 1.5-Metre Headroom Rule

This is where most measurement mistakes happen in Hackney, particularly in Victorian properties across Stoke Newington, Stamford Hill and Clapton where attic conversions are common.

When calculating usable floor area, Hackney strictly excludes any part of the room where the floor-to-ceiling height is below 1.5 metres. The full floor area under a sloped roof might be 9 m², but if 3 m² of that sits below 1.5 metres of headroom, the usable area is only 6 m². That could push a room below the 6.51 m² single-occupant threshold and make it unlettable under the licence.

The exclusion is not limited to attic rooms. Bay windows with low ceilings, dormer extensions with knee walls, and eaves in converted loft spaces all fall under the same rule.

Other Deductions

Beyond the headroom exclusion, Hackney deducts several other features from usable floor area:

• En-suite bathrooms or shower rooms built into a bedroom — the wet-room area is subtracted from the sleeping space
• Chimney breast projections — common in Victorian terraces, these reduce the rectangular floor area
• Fixed structural features that eat into the room footprint

The deductions are cumulative. A bedroom measuring 8 m² on an estate agent's marketing plan might come in at 6.2 m² once you subtract the en-suite and a chimney breast — below the single-occupant minimum.

Why Estate Agent Floor Plans Fail Inspections

Standard marketing floor plans from estate agents calculate gross internal area (GIA). They include the full footprint of every room without deducting for ceiling height, en-suites, or structural features. They are designed to sell a property, not to demonstrate licensing compliance.

Hackney's licensing officers need plans that show net usable sleeping space for each bedroom, with dimensions in square metres, window areas, and fire escape routes clearly marked. Submitting a marketing plan instead of a licensing-compliant plan causes processing delays at best and a failed inspection at worst.

Professional HMO floor plan surveys from firms like ZM Studio cost £123–£250 per property. For landlords with standard room layouts and no attic conversions, self-drawn plans can work — as long as every measurement is taken at floor level, headroom is checked at the critical 1.5 m mark along sloping ceilings, and en-suites and chimney breasts are deducted.

Shared Facility Requirements

For HMOs, room sizes are only part of the picture. Hackney also enforces amenity ratios for shared kitchens and bathrooms:

• Kitchens: minimum 1.8 m width, one full set of cooking facilities (four-ring hob, oven, grill, sink, fridge, storage) per five occupants
• Bathrooms: one bath or shower plus wash basin, and one separate WC with wash basin, per five occupants

These ratios can cap the number of occupants the council permits on the licence, even if every bedroom technically meets the size threshold.

The Hackney landlord licensing guide includes a room measurement worksheet with step-by-step instructions for the headroom deduction, floor plan templates, and a pre-submission checklist for HMO applications.

See more England guides →