Houses in Multiple Occupation can deliver some of the strongest yields in residential property — but they come with their own layer of licensing, safety standards and, crucially, far more moving parts to manage. Instead of one tenancy you might have five; instead of one rent you have five rents, five deposits and five renewal dates. This guide explains what counts as an HMO, the licensing and compliance rules that apply in England, and a practical way to manage the money room-by-room.
(Scotland, Wales and Northern Ireland operate separate HMO regimes — check the relevant national guidance.)
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What counts as an HMO?
In England, a property is generally an HMO when at least 3 tenants live there forming more than one household (i.e. not all one family) and they share a kitchen, bathroom or toilet. A "household" means a single person or members of the same family living together.
A large HMO — the type that triggers mandatory licensing — is one occupied by 5 or more people forming 2 or more households, sharing facilities. Bedsits, shared houses let to students or young professionals, and many converted flats fall within scope.
Licensing: mandatory, additional and selective
There are three licensing regimes, and more than one can apply to the same street:
- Mandatory licensing — applies nationwide to all large HMOs (5+ people, 2+ households). You must hold a licence before you let.
- Additional licensing — a council can extend HMO licensing to smaller HMOs (e.g. 3–4 occupiers) in some or all of its area.
- Selective licensing — a council can require a licence for all privately rented homes in a designated area, HMO or not.
Licences typically last up to 5 years, carry a fee, and impose conditions (maximum occupancy, amenity standards, safety certificates). Always check your specific council — schemes change and vary street by street.
Manage every room like its own tenancy
Lettfolio lets you split a property into rooms — each with its own rent, deposit and tenant — and see the building's rent roll and which rooms are void, at a glance.
Start freeHMO-specific safety & amenity standards
HMOs must meet everything a normal let does (gas, EICR, EPC, deposit protection, alarms) and more, because more people share the building:
Fire safety
Expect a higher standard: interlinked smoke alarms, often a mains-wired fire-alarm system, fire doors to bedrooms and risk rooms, clear escape routes, and emergency lighting in larger properties. A written fire risk assessment is effectively essential. Your licence conditions will specify what's required.
Minimum room sizes
Licensed HMOs in England have mandatory minimum sleeping-room sizes: broadly 6.51 m² for one adult, 10.22 m² for two adults, and 4.64 m² for a child under 10. Rooms under 4.64 m² can't be used for sleeping. Councils record the permitted number and size of rooms on the licence.
Amenity standards
Councils set ratios for shared facilities — typically one bathroom and adequate kitchen facilities per 3–5 occupiers (exact ratios vary locally). Kitchens need enough cooking, storage and worktop space for the number of tenants.
| Requirement | HMO position |
|---|---|
| Gas Safety (CP12) | Annual, as standard lets |
| EICR | Every 5 years (often a licence condition to evidence) |
| Fire alarm system | Interlinked alarms; often mains-wired + regular testing |
| Fire risk assessment | Expected; reviewed periodically |
| Minimum room sizes | 6.51 m² single / 10.22 m² double (licensed HMOs) |
| Amenity ratios | Bath/kitchen facilities per set number of occupiers (council-set) |
| HMO licence | Mandatory (5+/2+ households); check additional/selective |
Bills and council tax
HMOs are commonly let on a bills-included basis (one inclusive rent per room), which makes rooms easy to market but means you carry the utility cost and risk. Track each room's rent gross, and budget bills as a portfolio expense.
On council tax, regulations in England from December 2023 mean most HMOs are valued as a single dwelling (one council-tax bill for the whole property) rather than each room being banded separately — generally simpler for landlords. Confirm the position for your property with your local Valuation Office / council.
Managing the money, room-by-room
This is where HMOs get fiddly. With a spreadsheet you're tracking, per room: the current tenant, their rent, when it's paid, the deposit and which scheme it's in, the tenancy dates, and whether the room is let or void. Multiply by every room in every HMO and the admin compounds fast.
The cleaner model is to treat each room as its own mini-tenancy under the building, so you can answer the questions that actually matter:
- What's my rent roll on this house? The sum of the let rooms — not a single headline figure.
- Which rooms are void, and what's the cost of that void each month?
- Whose deposit is where, and when does each room's tenancy end?
- What's my real occupancy across the building and across all my HMOs?
5 key takeaways
- 3+ sharers = an HMO; 5+ from 2+ households = mandatory licensing. Below 5, check for additional/selective schemes.
- Unlicensed HMOs are expensive — up to £30,000 civil penalties and Rent Repayment Orders of up to 12 months' rent.
- HMOs carry extra safety duties — fire alarms and doors, fire risk assessments, minimum room sizes and amenity ratios on top of the standard certificates.
- Most HMOs are now one council-tax bill (England, from Dec 2023) — simpler, but confirm for your property.
- Manage room-by-room. Track rent, deposit, tenant and void status per room so you always know your true rent roll and occupancy.
An HMO is several tenancies wearing one front door. Lettfolio gives each room its own rent, deposit and tenant — and rolls them up into one clear view of the building. Start free at lettfolio.uk.
Sources
- GOV.UK — House in multiple occupation licence (mandatory HMO licensing and conditions)
- GOV.UK — Renting out your property (landlord responsibilities and private renting)
- legislation.gov.uk — Housing Act 2004 (HMO definition, licensing and management regulations)
- GOV.UK — Council Tax (HMO single-dwelling valuation, following the 2023 amendment regulations)
- Your local authority's licensing pages — additional & selective licensing schemes vary by council
Thresholds, room sizes and penalties are indicative; always confirm with your local authority. Verified June 2026.
Related guides
- The complete UK landlord compliance checklist — every safety certificate and duty, including the ones HMOs must meet.
- The Renters' Rights Act 2025: a landlord's guide — the tenancy reforms that apply to HMO lets too.