How Your Neighbour’s Cold Flat Warms at Your Expense

When the frost bites outdoors, plenty of households turn the radiators up - and end up quietly funding warmth in flats that stay cold.

Across Europe’s apartment buildings this winter, an unseen energy tug-of-war is underway: well-heated homes lose warmth through shared walls into nearby flats that are chilly or only partly lived in. The outcome is predictable - higher heating bills for those who do heat, and a sense of unfairness that is difficult to demonstrate and even tougher to contest.

Why your neighbour’s cold flat warms at your expense

Heat doesn’t stop at a front door. In blocks of flats, homes are thermally connected via party walls, floors, ceilings and shared pipework. If one flat is kept warm while the adjacent one is left cool, the laws of physics take over.

"Heat flows from the warmer flat to the colder one until the temperature difference shrinks – and you pay for the energy that escapes."

Specialists describe this as transmission heat loss. Whenever there’s a temperature difference across a surface, heat moves towards the colder side. In many older European buildings, internal partitions are poorly insulated - sometimes little more than brickwork or concrete - which can conduct heat very effectively.

So if your sitting room sits at 20°C while next door is left at 15°C, part of your energy is effectively warming their side through the shared wall. Over many weeks, that steady transfer can noticeably increase your usage - particularly where billing is based on individual metering and consumption.

Empty flats as hidden heat sinks

The issue is at its worst when the neighbouring property is completely vacant and unheated throughout winter. With no regular heating, its walls, floors and ceilings cool down towards outdoor-like temperatures, turning the whole flat into a cold store. A heated neighbouring home then sits in constant contact with a chilled “box”.

That typically leads to:

• Greater heat loss through shared walls and ceilings
• Lower surface temperatures inside your own flat, leaving rooms feeling draughty
• Radiators running for longer to hold the same thermostat setting
• Clearly higher heating bills compared with winters when the neighbouring flat was lived in

In buildings with thin internal walls or older glazing, residents often say a previously comfortable room starts to feel cold on one side - usually the wall facing an unheated or empty unit. Even when the air temperature is acceptable, a cold wall can draw heat from your body and create a lingering chill.

Why the law doesn’t protect you from cold neighbours

Many renters assume that if an empty neighbouring flat increases their costs, they can demand a rent reduction. Courts have tended not to agree. In a key ruling by a German district court in Frankfurt (Oder), judges found that tenants cannot require neighbouring flats to be occupied or heated.

"Vacant or under-heated neighbour flats are treated as part of normal living risk, not as a defect in your own home."

Legally, the landlord’s duty is to provide you with a flat that can be heated to a reasonable temperature using a functioning system. If your consumption rises because the flat above or next door is empty, that doesn’t alter the landlord’s obligation. Provided the heating works and the expected temperatures are achievable, courts rarely see a basis for reducing rent.

For tenants, the result is exasperating: your costs rise, but there is little formal remedy. Even so, building rules on heating-cost allocation can offer some safeguards.

Who pays when the empty flat actually uses heat?

Even a “vacant” or barely used flat may still show measurable consumption. Background warmth can come from riser pipes, residual heat within a central system, or brief heating periods intended to prevent damage. Regulators in countries including Germany have made clear that this usage cannot simply be shifted onto neighbouring households.

In many blocks, heating costs are split into a fixed element and a variable element linked to measured consumption, using heat cost allocators or heat meters. Put simply:

Cost type	How it is usually distributed
Basic share	Spread across all units, including vacant ones, often by floor area
Usage-based share	Based on actual metered consumption in each flat

Courts have also held that landlords must read the devices in empty flats and cover that metered usage themselves. They cannot just spread it across occupied homes. The reasoning is straightforward: if the unit generates no rent income, the landlord remains responsible for its recorded consumption.

Tenants still have heating duties

At the opposite end are residents who heat very little. Some take the view: “I’ll wear an extra layer and cut my costs.” They can - but only within limits.

Tenant organisations and landlord associations generally agree that renters have a duty of care towards the property. In practice, that means you must not allow the flat to become so cold or damp that the building fabric suffers harm.

"Letting a flat cool to near-freezing can cause burst pipes, mould, and warped floors – and trigger liability for the tenant."

Most guidance suggests maintaining a minimum background temperature, particularly in areas with water pipes or exposed external walls. That lower baseline is often around 16°C, though it depends on local rules and the building’s condition. Turning the heating down for a weekend away is usually fine. Leaving it fully off for weeks during the depths of winter is where problems start.

Where tenant responsibility begins and ends

Disputes tend to arise when one person’s extreme cost-cutting affects everyone else’s comfort. A tenant who never heats can:

• Increase heat loss from neighbouring, warmer flats
• Raise the likelihood of moisture issues and mould within shared structures
• Potentially breach their duty of care if damage to the building occurs

A landlord may step in if they can demonstrate that a tenant’s behaviour puts the building at risk. Simply trying to save energy is rarely enough for action. The threshold is usually crossed when there is clear evidence of damage or a serious, identifiable risk - for example, frozen pipes in a bathroom on a wall backing onto a neighbour’s kitchen.

Strategies to limit unwanted heat sharing

You can’t dictate how other people live, but you can reduce how much their choices affect you.

Practical steps inside your own flat

Low-cost changes can improve comfort along cold shared walls:

• Position bookcases or wardrobes against particularly cold internal walls to create an extra barrier from the chilled surface.
• Fit thick curtains or thermal blinds on windows that border unheated stairwells or balconies.
• Seal gaps around skirting boards and window frames to cut draughts that make rooms feel colder.
• Don’t block radiators with large furniture, as trapped heat forces the system to run harder.

These measures won’t stop heat passing into the neighbouring flat, but they can make your rooms feel more comfortable and reduce the temptation to keep turning the thermostat up.

Building-wide improvements and landlord talks

For meaningful reductions, the building itself often needs work. Better insulation to external walls, upgraded windows, or insulating partitions to stairwells can reduce overall heat loss. During some refurbishments, landlords also improve internal separating walls between flats - particularly where both noise and heat transfer are problems.

If long-term vacancies are driving bills up, tenants can raise the issue with the landlord or managing agent. There’s no automatic entitlement to compensation, but a practical discussion can sometimes lead to steps such as frost-protection heating in empty flats or limited changes to cost allocation where the law allows.

Key terms that help make sense of the problem

Two technical concepts come up repeatedly when people discuss heating issues caused by neighbouring flats.

Transmission heat loss is the energy that passes through building elements such as walls, ceilings, windows and floors. The greater the temperature difference across a surface - and the weaker its insulation - the higher the loss.

Thermal bridge describes parts of a structure where heat escapes more readily, such as concrete beams or poorly insulated corners. Flats next to empty units often feel these effects along shared structural elements that connect warm and cold zones.

Once these ideas are clear, the feeling of “heating for the neighbour” is less mysterious and more like simple physics - physics that can be managed, but not fully eliminated, in shared buildings.

What future energy policies could change

As governments pursue lower emissions and a fairer approach to energy use, regulators are scrutinising how costs are shared in multi-unit buildings. Digital heat meters, real-time usage feedback and stronger insulation standards all form part of this direction of travel.

Some energy economists argue for clearer rules on minimum temperatures in rented homes, and for landlords to keep vacant flats at a protective base level. That would reduce severe cold spots and the chain reaction of higher costs and damage risks they can create for neighbours.

For now, residents and owners in shared buildings face a simple reality: you don’t only share a roof and stairwell with your neighbours - you also share the physics of heat, whether they switch their radiators on or not.