What is the difference?
A standard BTL is let to a single household under one tenancy agreement. An HMO (House in Multiple Occupation) is let to three or more people from at least two separate households who share facilities such as a kitchen or bathroom. More tenants means more rent — but also more costs, more regulation and more active management.
Gross yield comparison
The gross advantage is real and substantial. But gross yield is only half the picture — HMOs carry significantly higher running costs that compress the net return considerably.
Cost comparison
| Cost item | Standard BTL | HMO |
|---|---|---|
| Utility bills | Tenant pays | Landlord pays |
| Council tax | Tenant pays | Landlord pays |
| Internet / TV licence | Tenant pays | Landlord provides |
| Letting agent fee | 8–12% of rent | 12–15% of rent |
| Maintenance | Lower turnover | Significantly higher |
| Licensing cost | None | £500–£1,500 / 5 yrs |
| Void risk | Full income lost | Partial — other rooms pay |
| Mortgage product | Standard BTL range | Specialist HMO required |
Net yield — realistic estimate
The 3.5% gross gap collapses to under 1% net once bills, higher management fees and licensing are factored in. Use the HMO Yield calculator and BTL Yield calculator to model your specific numbers.
HMO licensing
Mandatory licensing applies nationally to any HMO with five or more occupants from two or more households. Many local councils also operate additional licensing schemes covering smaller HMOs — sometimes down to three occupants — so you must check with your specific council before purchase.
Licences typically run for five years and cost between £500 and £1,500 depending on the authority. Operating an unlicensed HMO can result in a civil penalty of up to £30,000, a rent repayment order covering up to 12 months of rent, and a banning order preventing you from letting property.
HMO room size standards
| Occupant type | Minimum room size |
|---|---|
| Single occupant (over 10 years old) | 6.51 m² |
| Two occupants sharing | 10.22 m² |
| Cannot be used as sleeping accommodation | Under 4.64 m² |
These are national minimums introduced in October 2018. Some councils have adopted higher local standards. Rooms that fail to meet the minimum must not be let as sleeping accommodation — failure to comply is a licensing breach.
Management complexity
Standard BTL
- One tenancy, one point of contact
- Tenant responsible for bills and council tax
- Lower void risk management burden
- Standard AST — straightforward legal framework
- Wide choice of mortgage lenders
- Lower maintenance frequency
HMO
- Multiple tenancies, multiple relationships
- Landlord manages and pays all bills
- Licence compliance, room inspections
- Higher tenant turnover, more void admin
- Specialist mortgage — fewer lenders, higher fees
- Communal area upkeep and tenant disputes
When does HMO make sense?
Location is everything. HMOs perform best near universities, hospitals and city-centre employment hubs where demand for room-only lets is structural and persistent. In suburban or rural areas, filling four or five rooms simultaneously is far harder and voids hit income proportionally.
Scale improves the economics. A landlord managing one HMO bears the same licensing, compliance and management overhead as one managing five — but with a fifth of the income to absorb it. Experienced HMO investors typically treat it as a portfolio strategy, not a single-property play.
Hands-on investors benefit more. Self-managing an HMO — handling bills, tenant sourcing and maintenance directly — can push net yield to 6–7% and above. The moment you hand full management to an agent, the net advantage over a standard BTL narrows sharply.
HMO is genuinely more profitable in the right location — university towns, commuter cities with strong room demand. But it requires specialist finance, active licensing compliance and significantly more management. For hands-off investors the net yield advantage rarely justifies the complexity. For experienced landlords with local knowledge and the capacity to self-manage, HMO can realistically deliver 1–2% net yield above a standard single-let.