Houses in Multiple Occupation carry extra electrical safety obligations because more people, more appliances and more shared circuits are involved than in a standard single-let rental. Understanding exactly what's required — and how it differs from a normal tenancy — makes licensing, inspections and day-to-day compliance much easier to manage.
This guide sets out what counts as an HMO, the electrical standards that apply, how often inspections are needed, and the additional checks landlords often overlook.
What Counts as an HMO
Broadly, a property is an HMO if it's rented to three or more unrelated people who share facilities like a kitchen or bathroom. Many HMOs also need a licence from the local council, and larger HMOs — five or more occupants forming two or more households — need a mandatory licence under national rules, regardless of which borough the property is in.
| HMO Type | Definition | Licence |
|---|---|---|
| Standard HMO | 3+ unrelated tenants sharing facilities | Often required, depends on borough |
| Large/mandatory HMO | 5+ occupants, 2+ households | Mandatory nationwide |
| Converted building | Self-contained flats without full building regs compliance | Usually required |
Electrical Safety Standards for HMOs
The same underlying safety standard — BS 7671 — applies to HMOs as any other property, but the higher occupancy and shared-facility nature typically means more circuits, more consumer units, and a stricter approach to inspection. Where a property has been converted into multiple lettings, the wiring often needs to reflect that split, with separate circuits protecting each let room so a fault in one doesn't affect the rest of the building.
EICR Frequency for HMOs
Landlords are required to have the electrical installation in a rented property inspected and tested at least every 5 years, and HMOs are held to the same or tighter timescale depending on the local licensing conditions. Some councils set a shorter interval as a licence condition, so it's worth checking the specific requirement rather than assuming the 5-year default applies.
| Property Type | Standard EICR Interval |
|---|---|
| Owner-occupied home | No legal requirement, 10 years recommended |
| Standard rental | Every 5 years, or on change of tenancy |
| HMO | Every 5 years, sometimes shorter per licence condition |
Additional Checks Landlords Often Overlook
Beyond the EICR, HMOs commonly need PAT testing on shared appliances, working smoke and heat alarms in communal areas and individual rooms, and emergency lighting on escape routes in larger properties. Shared kitchens are a common source of oversight — a landlord-supplied fridge, kettle or toaster in a communal kitchen falls under PAT testing obligations, even though it's easy to treat it as incidental to the electrical installation itself.
Fire and Smoke Alarm Requirements
HMOs typically need interlinked smoke alarms across escape routes and a heat alarm in the kitchen, so that an alarm triggered in one part of the property is heard everywhere. Larger HMOs may also require emergency lighting and, depending on the layout, fire safety equipment such as extinguishers and fire blankets in shared areas. These requirements sit alongside, not instead of, the electrical installation checks.
Licensing and Electrical Compliance
Most councils ask for evidence of a valid EICR as part of an HMO licence application or renewal. Missing or out-of-date certification can delay or block a licence, and some councils will also ask to see PAT testing records and evidence of alarm testing before issuing or renewing a licence.
What to Do Before Renewing an HMO Licence
Check the expiry date on your current EICR well before the licence renewal deadline — inspections can take time to book and any remedial work needs to be completed first. Building in a buffer of several weeks before the renewal date avoids a licence being delayed by an inspection or repair that couldn't be scheduled in time.
Additional Wiring Considerations in HMOs
Shared kitchens, multiple fridges and freezers, and individually let rooms each drawing power mean HMO consumer units are often larger and more heavily loaded than a standard domestic board. Circuits are typically split so a fault in one room or shared area doesn't take out power to the rest of the property, and a consumer unit that's undersized for the number of circuits it now serves is a common finding during inspection.
Working with Your Local Council
Licensing conditions vary between London boroughs, and some ask for additional evidence beyond a standard EICR — such as records of communal fire alarm testing or emergency lighting checks. It's worth checking your specific council's HMO licensing page, since the baseline legal requirement and a particular council's licence conditions aren't always the same thing.
HMO Electrical Compliance Checklist
| Item | Why It Matters |
|---|---|
| Valid EICR within the required interval | Core evidence for licensing and legal compliance |
| Interlinked smoke alarms and kitchen heat alarm | Ensures an alarm is heard throughout the property |
| PAT testing on landlord-supplied appliances | Covers shared kitchen and communal equipment |
| Emergency lighting on escape routes (larger HMOs) | Required for safe evacuation in bigger properties |
| Records kept and available for licensing inspection | Councils can request evidence at any point |
How HMO Costs Differ from a Standard Rental
Because HMOs typically have more circuits, more consumer units, and additional required checks such as PAT testing and communal alarm systems, the overall compliance cost tends to be higher per property than a single-let rental. Our guide to landlord electrical safety certificates covers the baseline requirements that apply to any rented property before the additional HMO-specific items are added.
Who Should Carry Out HMO Electrical Checks
Given the higher occupancy and stricter licensing scrutiny, HMO electrical work and inspections should always be carried out by a qualified, registered electrician. A report or certificate from an unregistered individual may not be accepted by the council as valid evidence for a licence application, even if the work itself was done correctly.
Related reading: our guides on PAT testing, EICR costs in London and commercial electrical compliance cover this in more depth.
What Happens During an HMO Electrical Inspection
An HMO inspection follows the same core process as any EICR — visual checks of the consumer unit and accessories, followed by dead and live testing of individual circuits — but it typically takes longer and covers more ground. Each let room's socket and lighting circuits are tested individually, communal areas such as hallways, kitchens and bathrooms are checked separately, and any shared systems like door entry, communal lighting or laundry equipment are included in the scope.
Because HMOs often have a longer history of alterations — rooms subdivided, circuits added as occupancy grew — the electrician is also checking that past work meets current standards, not just that it's still functioning. This is why HMO inspections more frequently turn up C2 and C3 observations than a straightforward single-let property of the same age.
Common Issues Found During HMO Inspections
| Issue | Why It Happens |
|---|---|
| Overloaded consumer unit | More circuits added over time than the board was designed for |
| Non-interlinked smoke alarms | Standalone alarms fitted before interlinking became a requirement |
| Unrecorded appliance testing | Shared kitchen appliances replaced without updating PAT records |
| Circuits not split by room | Older conversions wired before individual room protection was standard practice |
None of these issues are unusual to find, and none of them mean the property can't be brought up to standard — they simply need to be identified and resolved as part of the licensing process, which is exactly what the EICR and its remedial follow-up work are there to do.
Cost Considerations for HMO Compliance
Because an HMO inspection covers more circuits, more rooms and more shared systems than a single-let property, it generally costs more than a standard EICR. The exact figure depends on the number of let rooms, the number of consumer units, and whether PAT testing and alarm servicing are carried out at the same time.
| Factor | Effect on Cost |
|---|---|
| Number of let rooms | More rooms means more circuits to test individually |
| Number of consumer units | Larger HMOs often split across multiple boards |
| Shared appliances requiring PAT | Adds per-item testing time on top of the EICR |
| Remedial work identified | Varies with the scale of C1/C2 items found |
Booking the EICR, PAT testing and alarm checks together in a single visit is usually more cost-effective than arranging each separately, since it avoids repeat call-out costs and gives a single, consistent set of records for the licence application.
Record-Keeping for HMO Licensing
Councils don't just want to know the work was done — they want to see it. Keeping a single, organised file of your EICR, PAT testing records, alarm test logs and any remedial work invoices makes licence applications and renewals significantly faster, and gives you something to hand over immediately if a council inspector visits unannounced.
It's worth keeping both digital and physical copies, since some councils still request paper evidence at a walk-in inspection. Where a property has multiple landlords or a managing agent involved, agreeing who holds the master file avoids records going missing between renewals.
Selling or Refinancing an HMO
An up-to-date EICR and supporting compliance records aren't only useful for licensing — they're also something a buyer's solicitor, surveyor or mortgage lender will typically ask to see before completing a purchase or refinance. An HMO with a lapsed EICR or missing PAT records can slow down a sale, since the buyer's side will usually want evidence of compliance resolved before exchange rather than taking it on trust.
Planning Ahead for Multiple Properties
Landlords managing several HMOs benefit from staggering inspection dates rather than letting them fall due at the same time. Spreading EICRs, PAT testing and licence renewals across the year avoids a bottleneck where several properties need attention at once, and makes it easier to book inspections with enough notice to resolve any remedial work before a licence deadline.
Frequently Asked Questions
Do all HMOs need an EICR every 5 years?
Landlords must have rental properties inspected at least every 5 years; many council HMO licences require evidence of a current, satisfactory EICR.
Is PAT testing required in HMOs?
Any appliances supplied by the landlord, particularly in shared kitchens or communal areas, should be kept in a safe condition — PAT testing is the standard way to evidence that.
What happens if an HMO fails its EICR?
Any C1 or C2 observations need remedial work before the report can be considered satisfactory, which councils typically expect to see resolved for licensing purposes.
Does each room need separate checks?
The EICR assesses the whole fixed installation, not room by room, but circuits serving individual rooms are tested as part of that inspection.
