A House in Multiple Occupation (HMO) is a property rented out by three or more people who are not from the same household (e.g. not family) but share facilities like a kitchen, bathroom, or toilet.
How do HMOs work?
An HMO allows landlords to rent out individual rooms within a single property to separate tenants, often on separate tenancy agreements.
This setup increases rental income compared to letting the property as a whole to one household.
HMO Property Investment Example:
An investor who buys a standard 3-bed property could rent it as a family home or as an HMO:
| Standard Buy-to-Let | Converted Four-Bed HMO | |
| Monthly rent | £1,200 | £2,000 (£500 per room) |
| Annual rental income | £14,400 | £24,000 |
| Annual costs (mortgage, management, compliance, etc.) | £7,200 | £10,000 |
| Net income | £7,200 | £14,000 |
| Property purchase price | £200,000 | £220,000 (including £20,000 conversion costs) |
| Yield formula | (Net Income ÷ Purchase Price) × 100 | (Net Income ÷ Purchase Price) × 100 |
| Net yield | 3.6% | 6.36% |
The HMO almost doubles the net yield compared to a standard buy-to-let, though it requires higher upfront investment and stricter compliance with regulations.
While the income potential is higher, landlords should expect more tenant turnover, increased management needs, and strict compliance with HMO regulations.
Types of HMOs
- Small HMOs – Usually 3–4 tenants from more than one household sharing facilities.
- Large HMOs – 5 or more tenants from more than one household.
- Student HMOs – Rented specifically to students, often with individual tenancy agreements.
- Bedsits / Room-by-Room Lettings – Each tenant rents a single room, sometimes with cooking facilities in the room, and shares a bathroom.
- Purpose-Built HMOs – Properties designed and built specifically for multi-let use.
- Social Housing HMOs – Let to local authorities, housing associations, or supported living providers to house vulnerable tenants such as care leavers, people with disabilities, or those in need of supported accommodation.
HMO Licensing Rules in the UK
You must have an HMO licence if:
- The property is rented to five or more tenants forming more than one household
- Facilities are shared, like kitchens or bathrooms
Some councils require a licence for smaller HMOs, so it’s important to check local rules before converting or buying a property for HMO use.
What are the benefits of investing in HMOs?
- Higher rental income compared to single-lets
- Diversified income – losing one tenant doesn’t mean losing all rental income
- Strong demand in areas with universities, hospitals, or large employers
What are the risks & considerations of investing in an HMO?
- More regulations – fire safety, minimum room sizes, waste disposal rules, etc.
- Higher running costs – utilities, maintenance, furnishing
- Management intensity – often needs a letting agent or hands-on landlord work
