HMO licensing explained: mandatory and additional
A house in multiple occupation (HMO) is a property let to three or more tenants who form two or more separate households and share a kitchen or bathroom. Most larger HMOs must be licensed by the local council before they are let — and getting the licence wrong is one of the most expensive mistakes an HMO landlord can make.
HMO rental yield
What is an HMO licence?
An HMO licence is a permission, granted by the local housing authority (your council), to operate a property as a house in multiple occupation. It is a property-and-people licence rather than a one-off sign-off: it names the licence holder and manager, caps the number of people and households who may live there, and attaches conditions on amenities, fire safety and room standards. Licensing sits separately from planning use class — a property can need both a licence and planning permission, and having one does not grant the other.
There are three regimes you need to keep straight: mandatory licensing (national, for larger HMOs), additional licensing (council-designated, for smaller HMOs), and selective licensing (council-designated, for all private rented homes in an area, not just HMOs).
Mandatory HMO licensing
A mandatory licence is required for any HMO occupied by five or more people forming two or more separate households who share a kitchen, bathroom or toilet. The old test that the property also had to be three or more storeys was removed in October 2018, so mandatory licensing now applies to qualifying HMOs whatever their height — a two-storey house let to five sharers needs a licence just as a converted block would.
A mandatory licence lasts for up to five years, and the council must be satisfied that the proposed licence holder and manager are “fit and proper” — broadly, no relevant unspent convictions, no record of breaching housing or landlord law, and the means to manage the property properly.
Minimum HMO room sizes (England)
- 6.51 sqm — minimum floor area for one person aged over 10
- 10.22 sqm — minimum for two people aged over 10 sharing
- 4.64 sqm — minimum for one child under 10
- Any room below 4.64 sqm cannot be used as sleeping accommodation at all
These national minimums are a floor, not a target: a council can set higher standards as a licence condition, and floor space taken up by very low head-height typically does not count. The licence will state the maximum number of people and households permitted in each room and across the property.
Additional licensing
Additional licensing lets a council require a licence for smaller HMOs that fall outside the mandatory scheme — typically those let to three or four occupants in two or more households. It only applies where the council has formally designated an area (often a whole borough, sometimes specific wards) after consultation, usually to tackle poor conditions or anti-social behaviour in a concentration of shared housing.
The practical effect is that the same three- or four-bed share that needs no licence in one borough may need one a mile away across a council boundary. Designations run for up to five years, and councils can renew or let them lapse, so an area’s status can change between purchases. Never assume a smaller HMO is licence-free: check the specific address.
How to check what your property needs
There is no single national HMO register — licensing is run address by address by each local council, so that is where you confirm your position. Before you buy or let:
Confirm before you let
- Ask the council’s private-sector housing team whether the address falls in an additional or selective licensing designation.
- Count occupants and households — five-plus in two-plus households almost always triggers mandatory licensing nationwide.
- Check the council’s public HMO register for any existing licence, its expiry, and the permitted occupancy.
- Confirm the room sizes meet the minimums above and that fire-safety and amenity standards are in place.
Mandatory licensing applies everywhere in England regardless of designation; additional and selective licensing apply only where that particular council has chosen to designate. Wales, Scotland and Northern Ireland run their own HMO licensing rules, so the figures above are for England.
Penalties for an unlicensed HMO
Operating a licensable HMO without a licence is a criminal offence, and the consequences are designed to wipe out the extra income an HMO produces:
- A civil penalty of up to £40,000 imposed by the council per offence (raised from £30,000 under the Renters’ Rights Act, in force from 1 May 2026), or an unlimited fine on prosecution.
- A rent repayment order: tenants — or the council where benefit was paid — can reclaim up to two years’ rent.
- Restricted possession. Section 21 ‘no-fault’ evictions were abolished on 1 May 2026, and letting an unlicensed HMO further limits your ability to regain possession lawfully.
- For serious or repeat offenders, a banning order and entry on the database of rogue landlords.
Lenders care about this too. An HMO let without the licence it needs is harder to refinance, harder to insure, and harder to sell, because a buyer inherits the risk. Getting licensing right is part of the property’s value, not just its paperwork.
Where Vortex Finance fits
We arrange the borrowing; you confirm the licensing. HMO mortgages are specialist buy-to-let products priced on rooms and either a bricks-and-mortar or an investment valuation, and lenders will expect the licence position to be clear. If you are converting a standard home into an HMO we can also fund the works with refurbishment finance, move at speed on an auction or chain-break with a bridging loan, or fund a ground-up scheme with development finance. Larger portfolios and mixed-use blocks can sit on a commercial mortgage. Asking won’t affect your credit score.
HMO mortgages All calculatorsLicence sorted? Let’s fund the HMO.
Confirm the licensing with your council, then come to us for the finance — we shop 100+ lenders and return indicative HMO terms within 24 hours.