Energy and Safety in HMOs and Shared Houses

A house in multiple occupation (HMO) is not simply a bigger rented home. It is a property where households share parts of the building, and that sharing changes both the law that applies and the risks that follow. An HMO licence exists to ensure "property standards, management, fire safety, room sizes and suitability for occupation"¹, and the manager of an HMO carries specific legal duties to keep shared fixtures, fittings and appliances "in good and safe repair and in clean working order"². On top of that, landlords across the rented sectors must have electrics checked at least every 5 years³.

For the people living there, the practical questions are concrete: who fixes the tumble dryer in the shared kitchen, whether a portable heater in a bedsit is safe, what happens when a reported fault is ignored, and how the bills are divided when five people share one meter. This page works through each of those, using the official rules and the safety guidance that applies across England, Scotland, Wales and Northern Ireland, and it says plainly where the rules differ between the nations.

Why shared living multiplies the electrical fire risk

Electrical safety rules exist for a blunt reason. The building regulations covering electrics "have been introduced to help reduce the number of deaths, injuries and fires caused by faulty installations"⁷. The Building Regulations as a whole exist "so that all householders will have a safe and healthy home in which to live and a home which is energy efficient"⁸. In an ordinary family home, one household uses one set of sockets, one heating system and one set of appliances, and the occupants usually know the history of each item.

A shared house breaks every one of those assumptions. Several households draw power from the same installation, often with appliances nobody can vouch for: a second-hand heater bought online, a dryer inherited from a previous tenant, a bike battery charging in a hallway. The load on the circuits is heavier and less predictable, and the number of potential ignition sources rises with every additional occupant:

• more sockets in constant use, and more leads run under doors and across landings
• more appliances left running unattended, or while the last person is asleep
• more items with an unknown history, bought second-hand or left by previous tenants
• more escape routes passing through shared space, so a fire in one room threatens everyone

The same wiring fault that would inconvenience one family can put four or five households at risk overnight, in a building where a fire in one room blocks the only stairs for everyone.

That is why the law treats HMOs differently. The licence conditions, the manager's duties and the electrical safety standards all exist because the risk is structural, not because any individual occupant is careless. The Health and Safety Executive is responsible for making sure electrical installation work is safe in industrial and commercial buildings⁷; in the domestic rented sector, enforcement sits with local housing authorities, and the government's guidance is addressed jointly to "landlords, tenants and local councils"³. Renters can read more about the sector they sit in on the UK private rented sector, and about what they can and cannot change on renting and home energy.

What landlords and HMO managers must do

The duties stack up in layers, and it is worth seeing them side by side:

The HMO management duty is defined broadly: the covered items include "lighting, space heating or water heating appliances", bathroom items, food storage and cooking appliances, and "washing machines or other laundry appliances"². In practice this means the landlord or manager, not the occupants, is responsible for the state of the shared washing machine, dryer, cooker and fridge.

Alongside safety, landlords carry energy efficiency duties. In England and Wales, domestic private rented property must meet the 2018 "Minimum Level of Energy Efficiency" standard, EPC band E⁴, and landlords "must not unreasonably refuse such requests where the improvements can be funded at no cost to the landlord", for example through grants or third-party funding¹⁰. The same guidance lists exclusions:

• listed or protected buildings
• temporary buildings
• places of worship
• certain HMOs not sold or let as a single rental in the past ten years¹⁰

In Northern Ireland, official advice on making a rented home fit to live in says the landlord should "make sure roof spaces are insulated; replace draughty, ill fitting windows and doors; draught proof external doors and windows (but not rooms containing an open-flue gas appliance); insulate exposed water pipes; fit the hot water tank with a good quality insulation jacket"¹¹. Grant schemes such as Northern Ireland's Affordable Warmth Scheme require the private landlord to "agree to the energy efficiency measures being carried out"¹².

Building regulations add a further layer whenever work is done: they "include requirements to ensure that fuel and power is conserved"¹³, and under the reformed Decent Homes Standard consultation, "any measures taken to meet energy efficiency requirements such as heating system upgrades or insulation must comply with relevant building and fire safety regulations and preserve essential safety features"¹⁴. The full picture of a landlord's obligations is on landlord duties on energy, heating and home safety, and the detail of the five-yearly checks is on electrical safety checks in rented homes.

When a fault is reported and nothing happens

The rules recognise that improvement work can stall for reasons outside the landlord's control. Under regulation 31 of the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015, the requirement to improve does not apply "at any time when the landlord has, within the preceding five years, been unable to increase the energy performance indicator for the property to not less than the minimum level of energy efficiency as a result of the tenant refusing consent to any relevant energy efficiency improvement"¹⁵. The same exemption covers third-party consent being refused, or granted subject to a condition the landlord cannot reasonably comply with¹⁵. So a tenant's refusal can lawfully pause the improvement duty, but it does not pause the safety duties: electrical safety standards must still be met during the tenancy⁹, and in Northern Ireland a private tenancy landlord must have a faulty alarm "replaced when notified the alarm is faulty"¹⁶.

In Scotland, the direction of travel is firmer. The Heat in Buildings Bill consultation proposed that private landlords "will need to have met the minimum energy efficiency standard" by the end of 2028⁵, that properties not meeting the standard by then "would not be allowed to be leased to a new tenant"⁵, and that "private landlords would be subject to civil penalties if they don't meet the minimum energy efficiency standard after 2028"⁵. Owner occupiers would face the same standard at the end of 2033⁵. These are proposals from the 2023 consultation, not yet settled law, and the dates should be read as the government's stated intent rather than a current requirement.

Tenant attitudes matter to whether any of this happens. Among renters, 54% said they were aware of minimum energy standards for rental properties in Winter 2025, up from 48% in Winter 2024⁶. On the other side, a Welsh retrofit case study recorded "an increasing number of objections, tenants very cautious around switching to electric heating, particularly with bills rising"¹⁷. The practical lesson for a shared house is that a written report of a fault creates the record that enforcement depends on, and that tenants who want improvements can use the route described on asking a landlord for energy improvements. Where the problem is damp rather than electrics, see damp and mould in rented homes.

Moveable heaters used in communal areas

Portable heaters are the classic answer to a cold room in a shared house and one of the classic causes of house fires. Electrical Safety First's product guidance is specific:

• "avoid powering a heater from an extension lead"
• "make sure it is at least one metre away from combustible materials"
• "Never dry clothes directly on or close to your heater"
• "Use smoke alarms or heat detectors nearby"¹⁸

The charity's winter campaign repeated the core rules: "Never power a heater from an extension lead, they can easily be overloaded and cause fires", "Put your heater on a level surface, well away from anything or anyone that could knock it over", "Never leave your heater unattended for long periods whilst in use, or while you are asleep", and "Regularly inspect your heater for damage and deterioration. If it isn't in good condition, don't use it!"¹⁹.

In a shared house these rules bite harder than in a flat occupied by one household. A heater in a bedsit is often running in the smallest room in the building, close to a bed, curtains and clothes. A heater in a shared living room may be moved from room to room, plugged into whatever socket is free, and left running when the last person goes to bed, which is exactly what the guidance forbids¹⁹. Buying matters too: "Make sure you buy from manufacturers or retailers that you know and trust. Avoid second-hand heaters but if you do then ask them what safety checks are carried out"¹⁹.

The heating system itself is the better answer, and the standards that govern it are worth knowing. Building regulations require that "each room should be provided with thermostatic room controls" for heating systems in new dwellings, or when a heat generator such as a boiler is replaced in an existing dwelling²⁰. Local energy advice programmes, such as the grant-funded schemes run by councils, will "Give you day to day energy efficiency hints and tips and make sure your heating controller is working correctly"²¹. A tenant who cannot get a room warm enough should treat that as a property standards issue for the landlord, not a reason to run a heater all night. The health side of a cold home is covered on cold homes and health, and the minimum temperatures worth expecting are on what temperature your home should be in winter.

Shared kitchens: white goods, leads and sockets

The shared kitchen is where the HMO manager's duty does the most work. The management regulations require that "fixtures, fittings or appliances used in common by two or more households within the HMO are maintained in good and safe repair and in clean working order"², and the definition of covered items runs from lighting and space or water heating appliances through to "washing machines or other laundry appliances"². In practice this means the landlord or manager, not the occupants, is responsible for the state of the shared washing machine, dryer, cooker and fridge, and a broken dryer is a repair issue to report, not a reason to run a drying rack against a heater.

The extension lead rule applies to white goods just as it does to heaters. Electrical Safety First's guidance is to "avoid powering a heater from an extension lead"¹⁸, and the reasoning, that leads "can easily be overloaded and cause fires"¹⁹, applies with more force to a tumble dryer or washing machine, which draw high current for long periods. A shared kitchen with too few sockets is a property standards problem. Overloading a four-way adaptor behind the counter is the household's workaround for the landlord's shortfall, and it concentrates the fire risk in the one room that already contains the most ignition sources.

Laundry habits matter as much as wiring. Drying clothes on or near a heater is explicitly ruled out¹⁸, and the one metre clearance from combustibles¹⁸ applies to a pile of laundry as much as to furniture. Where the shared house has a dryer that vents poorly, or none at all, condensation becomes the next problem, and the duties around that are on damp and mould in rented homes. For the specific question of whether rented appliances need portable appliance testing, see PAT test stickers on rented appliances.

Online purchases and items withdrawn from sale

Shared houses accumulate appliances from everywhere: previous tenants, online marketplaces, hand-me-downs from family. The rules that govern what can be sold are set at UK level. The Ecodesign for Energy-Related Products and Energy Information Regulations 2021 "aim to increase producer responsibility, reduce energy usage and electrical waste, and enable consumers to identify the most energy efficient products on the market"²². That is a duty on producers and sellers; it does not inspect the second-hand dryer already sitting in the kitchen.

The safety advice for buyers is to "buy from manufacturers or retailers that you know and trust" and to avoid second-hand heaters, or if buying them, to ask what safety checks are carried out¹⁹. In a shared house, the practical step is collective. If an appliance has been recalled, or has been involved in a suspected carbon monoxide incident, official guidance is that "Appliances should not be used again until they have been serviced by a registered engineer"²³. Unplug it, tell everyone in the house, and report it to the landlord or manager, since a shared appliance is covered by the good-repair duty². The warning signs of carbon monoxide itself are on signs of carbon monoxide poisoning.

Smoke detectors and overnight danger

Most of the fire deaths this page's rules exist to prevent happen at night, which is why the alarm requirements are written into law rather than left to preference. In Northern Ireland, the 2024 regulations state that "Smoke and heat alarms must be installed and maintained in accordance with British Standard BS 5839-6"¹⁶, and the same regulations put the replacement duty on the landlord when a faulty alarm is reported¹⁶. Scotland's retrofit schemes specify the hardware and the placement: "smoke alarms BS EN14604:2005", with "one smoke alarm in the living room or the room you use most; one smoke alarm in every hallway or landing; and one heat alarm in the kitchen"²⁴, interlinked, in dwelling houses where energy efficiency measures are installed.

Electrical Safety First's advice to every household is to "Ensure you have a working smoke alarm on every floor in your home and test it regularly, it could save your life"¹⁹. In an HMO the logic is stronger still: more people asleep on more floors, more escape routes that pass through shared space, and a fire that starts in one occupant's room threatening everyone. The placement pattern from the Scottish scheme rules, living room, every hallway and landing, heat alarm in the kitchen²⁴, maps well onto a shared house even outside Scotland, and the portable heater guidance adds that detectors should sit near any heater in regular use¹⁸. The full rules for rented homes across the UK are on smoke and carbon monoxide alarm rules in rented homes.

Warmth, meters and dividing the cost

A house let by the room raises a question a single tenancy never does: who pays for what? No billing code for HMOs is set out in the official material, so what follows is what is established and no more. Heating costs are a live political concern shaping the standards themselves. In the New Build Heat Standard consultation, "the most common them was a concern based on the presumption that ZDEH could raise the cost of heating homes", with greater electricity use costing more than gas²⁵. In the earlier Energy Efficient Scotland consultation on a standard for owner-occupied homes, organisations were far more open to time-limited exemptions than individuals: "organisations (85%) were more likely than individuals (39%) to be in favour of this"²⁶.

The standards framework treats conservation of fuel and power as a core purpose of building law. Scotland's Section 6 exists "to ensure that effective measures for the conservation of fuel and power are incorporated" in dwellings²⁷, and the consultation analysis for the Heat in Buildings Bill records support for "introducing a minimum energy efficiency standard in owner occupied homes by the end of 2033"²⁸. The clean heating technologies the Scottish proposals list, "heat pumps, electric storage heaters, heat networks, wet electric heating and other direct electric heating technologies"⁵, are the options a landlord weighing a shared house's future would weigh, and the consultation proposes that private landlords meet the minimum standard by the end of 2028⁵.

For occupants, the practical position is this: the fabric and the heating system are the landlord's to improve and the occupant's to pay to run. Awareness is improving, with 54% of renters aware of minimum energy standards in Winter 2025⁶, but awareness of a standard does not settle the split of a shared bill. Where a house has one meter and a bills-included rent, the occupant's leverage is the property standards and fitness duties described above; where rooms are billed separately, the occupant's leverage is their own usage. The wider context of affordability is on fuel poverty in UK households, and the student variant of the shared-bills question is on energy in student accommodation.

How to locate an approved electrical contractor

When work is needed, the route is fixed. Welsh building regulations guidance explains the two ways safety can be checked: "This checking can be done in either of 2 ways", using "an electrician who is registered by an organisation authorised by the Secretary of State and is able to" certify the work as safe without notifying Building Control, or by notifying the building control section of the local authority²⁹. In other words, a registered competent person can self-certify; an unregistered electrician means a building control application.

1. Ask whether the electrician is registered with a competent person scheme authorised by the Secretary of State²⁹.
2. If they are, they can certify the work as safe without notifying Building Control²⁹.
3. If they are not, the work must be notified to the building control section of the local authority before it proceeds²⁹.
4. Keep the resulting certificates: the five-yearly inspection record³ and any certification of new work are the documents a licence inspection, an insurer or an enforcement officer will ask for.

The same guidance notes that "Building regulations also apply to other aspects of the work such as electrical installation and plumbing work" when a heating technology such as micro-combined heat and power is installed³⁰. For a shared house, the choice of electrician is not only about competence but about evidence. A tenant cannot compel a landlord to use a particular electrician, but a tenant can ask whether the person used is registered under a competent person scheme, because that is the scheme the rules themselves recognise²⁹. The HMO-specific version of the electrical duties is on landlord electrical safety in an HMO, and what a tenant can check themselves is on tenant electrical safety checks.

What stays outside the occupants' control

The lens for this whole subject is independence, and in a shared rented house that independence is limited in ways worth stating plainly. The occupant of an HMO does not own the wiring, the heating system, the meter or the fabric. The electrical installation is the landlord's to check every five years³; the shared appliances are the manager's to repair²; the energy efficiency standard is the landlord's to meet, subject to the tenant-consent exemption¹⁵; and in Scotland the deadlines being proposed, 2028 for private landlords and 2033 for owner occupiers⁵, are the government's timetable, not the occupant's.

Even the retrofit programmes that promise improvement carry their own risks, and the oversight data is candid about it. Official analysis of ECO4 and the Great British Insulation Scheme found that "a small percentage of installations (6% of EWI and 2% of IWI installations) were found to have health and safety risks to the occupants"³¹, and the government has stated in Parliament that "Wherever these kinds of risks are identified, installers are required to make them safe within 24 hours"³². A tenant in a shared house where external wall insulation is being fitted can reasonably expect that rule to be honoured.

The national policy priorities behind all of this are stated openly in the Future Homes and Buildings Standards consultation: "Protect occupants against high energy bills" and "Reduce energy demand of homes and non-domestic buildings by requiring high performing building fabric and building services in new buildings, thereby improving energy security"³³. Those aims serve the occupant, but the occupant's own route to energy independence in a shared rented house runs through the reporting and enforcement rights described on this page, and through the wider options set out on energy independence when you rent. What a household can control is what it plugs in, what it reports in writing, and what it knows the landlord is required to do.