TL;DR
Do I need an HMO licence? Yes, if you let to 5 or more unrelated people forming 2 or more households who share kitchen, bathroom, or toilet facilities — that’s the mandatory HMO licence threshold. Below the mandatory threshold, many London boroughs operate Additional Licensing schemes covering 3 or 4 tenant HMOs. Couples and family groups count as one household. Operating an HMO without the required licence carries penalties up to £30,000 per offence.
If you’re wondering “do I need an HMO licence” for a specific property, the three-tier check below resolves it in a few minutes.
Do I need an HMO licence?
There are three licensing tiers to check, in order:
- Mandatory HMO licensing — national rule, applies to every let in England with 5+ unrelated tenants from 2+ households sharing facilities
- Additional HMO licensing — borough-specific schemes covering smaller HMOs (often 3 or 4 tenants), set by local council
- Selective licensing — borough-specific schemes covering all rented properties in designated geographic areas, regardless of HMO status
If any of the three applies to your property, a licence is required. The decision tree below walks through each in turn — answering the question “do I need an HMO licence” for the most common London letting scenarios.
For the broader HMO context — including licence costs, application process, and renewal cycles — see our HMO licensing in London pillar guide. For specific fees, see HMO licence cost: fees, renewals, and how to apply. [P5 / S5.2 placeholders — replace when published]
The mandatory threshold: 5 tenants from 2+ households
The cleanest way to answer “do I need an HMO licence” is to start with the national mandatory rule. Under the Housing Act 2004, a Mandatory HMO licence is required where all three of these conditions are met:
- The property is occupied by 5 or more people
- The occupants form 2 or more households (see definition below)
- The occupants share basic amenities — kitchen, bathroom, or toilet
All three are required for mandatory licensing to apply. A 5-person family in one household isn’t an HMO. Five unrelated lodgers sharing a kitchen is. Four unrelated lodgers sharing a kitchen is not subject to mandatory licensing — but may still be subject to Additional Licensing (see below).
The threshold counts occupants, not bedrooms. A 4-bedroom property let to 5 people (two in one bedroom) is an HMO under the mandatory rule.
What counts as a “household”?
A household is the operative concept that distinguishes a family share from an HMO. The Housing Act 2004 defines a household as:
- A single person, or
- People related by blood, marriage, or civil partnership, or
- People living together as a couple (whether married or not)
This means:
- A couple = one household
- Parent + children = one household
- Two siblings + their respective partners = two households (each couple is a separate household)
- Three unrelated friends in a flatshare = three households
- A landlord plus four lodgers = the lodgers are likely separate households, but the landlord living on-site may change the licensing position (resident landlord exemptions can apply)
A property with 2 or more households sharing facilities crosses the HMO definitional threshold; the question of licensing then depends on whether mandatory, additional, or selective rules apply.
Additional and Selective HMO licensing
If the mandatory rule doesn’t apply, the next step in working out “do I need an HMO licence” is to check the borough-level schemes. Many London boroughs operate Additional Licensing schemes that cover smaller HMOs — typically 3 or 4 tenants from 2+ households, sharing facilities. Where Additional Licensing applies, the property requires a licence even if it sits below the mandatory threshold.
Selective Licensing is broader still: it applies to all rented properties in a designated geographic area, regardless of HMO status. A standard family let in a Selective Licensing area still needs the licence.
The borough position changes — schemes are introduced, extended, modified, and (occasionally) withdrawn. The only reliable way to check the licensing position for a specific property is to look at the local council’s licensing page directly. The gov.uk private-renting HMO guidance links through to each local authority.
HMO licence triggers — the decision framework
| Scheme type | Threshold | Geographic scope | Action required |
|---|---|---|---|
| Mandatory HMO | 5+ persons from 2+ households sharing facilities | National (England) | Apply to council for mandatory HMO licence |
| Additional HMO | Often 3+ persons from 2+ households (council-specific) | Borough-specific designations | Apply for additional HMO licence per scheme |
| Selective Licensing | All rented properties in designated areas | Specific streets / wards / boroughs | Apply for selective licence regardless of HMO status |
| No licensing required | Below all of the above | Outside designated areas | No licence — standard letting compliance only |
To determine which of these applies — and therefore whether you do need an HMO licence — work through these three checks in order:
- Count occupants and households. If 5+ persons from 2+ households share facilities → mandatory HMO required, full stop
- Check the council’s Additional Licensing scheme. If your property meets the borough’s smaller-HMO threshold → additional licence required
- Check the council’s Selective Licensing designations. If the property sits in a designated area → selective licence required regardless of HMO status
A property can be subject to multiple licensing schemes (e.g. selective designation plus additional HMO designation). One application typically covers both, but the council will confirm.
Special cases: students, family groups, live-in landlords
Several letting setups complicate the “do I need an HMO licence” question — student lets, family groups, and live-in landlord arrangements each have their own treatment under the Housing Act 2004.
Student lets. Three or more students sharing a let are typically treated as multiple households (each student is generally a separate household under the Act). A 5-student let usually meets the mandatory HMO threshold; a 3-student let may meet the additional licensing threshold depending on borough. Some councils operate specific student-targeted licensing schemes.
Family groups. A let to a single family — regardless of family size — is one household and is not an HMO. A 6-person extended family in a 4-bed house is not an HMO.
Live-in landlords. A landlord living on the property with up to 2 lodgers is typically exempt from HMO licensing (specific exemptions in the Housing Act 2004 apply). Above 2 lodgers, the position becomes complex and council-specific.
Mixed lets. A property with a self-contained flat plus separate rooms let to non-related tenants can fall into HMO definition for the room-let portion. Each council treats this differently.
What happens if I don’t have an HMO licence?
If the answer to “do I need an HMO licence” is yes and you operate without one, the enforcement consequences are significant. Operating an HMO without the required licence is a criminal offence under the Housing Act 2004. Local authority enforcement powers include:
- Financial penalties up to £30,000 per offence (as an alternative to prosecution)
- Rent Repayment Orders — tenants can apply to recover up to 12 months of rent paid during the unlicensed period
- Restrictions on statutory possession routes — non-compliant HMO landlords face additional restrictions on Section 8 possession applications under the Renters’ Rights Act 2025; the practical effect is that recovering possession from an unlicensed HMO is materially harder than from a compliant property
- Prosecution with criminal record and unlimited fines on conviction
- Banning orders in serious or repeat cases
The HMO compliance stack also includes elevated electrical and fire safety standards. For the EICR cycle on HMOs (often annual or 3-yearly rather than the 5-year default), see how long does an EICR last. For broader compliance certificates, see our EICR and landlord safety certificates pillar guide. [S2.3 / P2 placeholders — replace when published]
Working with Click Inventories
Once you’ve confirmed “do I need an HMO licence” is a yes for your property, the compliance work begins. HMO landlords face elevated compliance and inspection obligations across the property lifecycle — frequent mid-term inspections, complete certificate stacks (EPC + Gas Safety + EICR with HMO-frequency renewals), and inventory documentation that holds up under both deposit adjudication and licensing inspections.
Click Inventories supports HMO landlords with AIIC-format inventories, mid-term inspection cycles, and bundled compliance certificates. See our mid-term inspection service, the full compliance bundle, or read about why landlords choose us.
Whether you do need an HMO licence ultimately depends on your specific property, tenants, and borough — but the three-tier framework above will give you the right answer for almost every London letting.
Frequently asked questions
Do I need an HMO licence for 4 students plus a friend?
The question “do I need an HMO licence” comes up most often with student lets, because the household-counting rules surprise most landlords.
If they form 5 unrelated households (students are typically treated as separate households), yes — mandatory HMO licensing applies. The fact that they’re a friendship group rather than a formal share doesn’t change the household-counting test. The Housing Act 2004 looks at the legal/family relationship, not the social one.
Does my partner and I count as one household?
Yes. People living together as a couple (whether married, in a civil partnership, or simply cohabiting) are one household under the Housing Act 2004. A property where you and your partner live with three unrelated lodgers contains 4 households (you + the three lodgers each).
What if my tenants are siblings — are they one household?
Siblings sharing as adults are typically treated as separate households unless they share a common-purpose family arrangement (very narrow exemption). For practical purposes, a let to 3+ adult siblings sharing a flat will usually count as multiple households for HMO purposes. The conservative answer is to check directly with the council.
Am I exempt if I live there too?
A live-in landlord with up to 2 lodgers is typically exempt from HMO licensing — this is one of the narrow exemptions in the Housing Act 2004. Above 2 lodgers, exemption status becomes complex and varies by council. Always confirm directly with the local authority before relying on the exemption.
What’s the difference between mandatory and additional licensing?
Mandatory HMO licensing applies nationally to every let with 5+ occupants from 2+ households sharing facilities. Additional licensing is borough-specific and typically covers smaller HMOs (often 3-4 tenants) in council-designated scheme areas. A property may be subject to one, both, or neither — the council’s licensing page is the authoritative source.
