Why Your Neighbour’s Cold Flat Raises Your Heating Bills

When frost takes hold outdoors, many households turn up their radiators – while unwittingly helping to heat homes that remain cold.

This winter, apartment buildings across Europe are the setting for a quiet energy struggle: warmth from properly heated flats passes through shared walls into cold, partly vacant neighbouring homes. Those who heat their properties face larger bills, while proving the cause – let alone challenging it legally – is difficult.

Why your neighbour’s cold flat warms at your expense

Heat does not stop at ownership lines. In blocks of flats, homes are thermally connected by walls, ceilings, floors and shared pipework. Where one flat is warm and the adjoining one is cold, 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.

Energy specialists describe this as “transmission heat loss”. Whenever temperatures differ on either side of a wall, heat travels towards the cooler side. Internal walls in older European properties often have very little insulation. In some cases, they are simply brick or concrete partitions that transfer heat particularly well.

When your sitting room is at 20°C but the next-door flat is only 15°C, part of your heating is effectively warming that neighbour’s space through the party wall. Across weeks and months, this continual transfer raises your energy use – particularly in buildings with individual meters and usage-based billing.

Empty flats as hidden heat sinks

The impact is greatest when the adjoining property is entirely vacant and unheated throughout winter. Its walls, ceilings and floors can become almost as cold as outdoors, making the whole flat a cold store. Any neighbouring heated home therefore remains in constant thermal contact with a chilled enclosure.

This can result in:

• Greater heat loss through communal walls and ceilings
• Lower surface temperatures in your own flat, leaving rooms feeling draughty
• Radiators operating for longer to sustain the same thermostat setting
• Clearly higher heating costs than in winters when the neighbouring flat was occupied

In properties with thin walls or older windows, occupants frequently say that a room which was previously comfortable suddenly feels cold along one side – typically the side adjoining an empty or unheated flat. Even where the measured air temperature is adequate, a cold wall draws warmth from your body and produces an ongoing sensation of chill.

Why the law doesn’t protect you from cold neighbours

Many renters believe they can seek a rent reduction if a vacant neighbouring flat increases their heating costs. Courts take a different view. In a leading ruling, a German district court in Frankfurt (Oder) decided that tenants cannot demand that adjoining flats 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, a landlord must provide a flat with a working heating system that can achieve a reasonable temperature. Higher consumption caused by an empty upstairs property does not alter that duty. Provided the heating works and the required temperatures are attainable, courts seldom consider there to be a basis for reducing the rent.

That is understandably frustrating for tenants. Their bills increase, but formal remedies are limited. There are, however, certain safeguards within the way a building’s heating charges are apportioned.

Who pays when the empty flat actually uses heat?

A flat that is “empty” or heated only rarely may still record energy use. Background warmth may come from riser pipes, remaining heat from central systems, or brief periods of heating intended to prevent damage. Regulators in countries including Germany have made clear that this usage cannot simply be transferred without notice to neighbouring tenants.

In many buildings, heating costs are divided into two elements: fixed basic charges and a variable portion linked to actual consumption, recorded by heat cost allocators or heat meters. A simplified breakdown is below:

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 found that landlords must take readings from devices in vacant flats as well and meet the cost of that usage themselves. They cannot merely spread those charges across occupied properties. The legal reasoning is that, where a unit produces no rental income, responsibility for its metered consumption remains with the landlord.

Tenants still have heating duties

At the opposite end are tenants who use very little heating. Some take the view: “I’ll just put on a jumper and save money.” They are entitled to do so – within limits.

Tenant bodies and landlord organisations broadly agree that residents owe a duty of care towards the rented property. In practical terms, they must not let the home become so cold or damp that it damages the fabric of the building.

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

Most guidance advises maintaining at least a basic temperature, particularly in rooms containing water pipes or external walls. This minimum is often about 16°C, though it varies according to local requirements and building conditions. Turning the heating down while away for a weekend is usually acceptable. Leaving it entirely off for several winter weeks is hazardous.

Where tenant responsibility begins and ends

Disputes can arise when one neighbour’s severe economy clashes with another’s comfort. A tenant who does not heat at all:

• Adds to heat loss from neighbouring, warmer flats
• Increases the possibility of damp and mould problems in shared building structures
• Could breach their duty of care if structural damage results

Landlords may step in where they can demonstrate that a tenant’s conduct endangers the property. Saving energy by itself will generally not justify action. The threshold is reached where there is specific evidence of damage or a serious threat – for example, frozen bathroom pipes adjoining a neighbour’s kitchen.

Strategies to limit unwanted heat sharing

Although you cannot dictate how neighbours use their homes, there are ways to lessen the consequences of their decisions.

Practical steps inside your own flat

Several low-cost measures can make a meaningful difference beside cold internal walls:

• Put bookcases or wardrobes against especially cold internal walls to create an extra barrier between you and the chilled surface.
• Fit heavy curtains or thermal blinds to windows next to unheated stairwells or balconies.
• Close gaps around skirting boards and window frames to reduce draughts that worsen the perception of cold.
• Do not position radiators directly behind large items of furniture, as this can hold in heat and force the system to work harder.

These actions will not prevent heat from passing into a neighbour’s flat, but they may increase comfort and make you less likely to raise the thermostat.

Building-wide improvements and landlord talks

More substantial improvements require attention to the building overall. Insulating external walls, upgrading windows or insulating stairwell partitions can reduce general heat loss. During some refurbishments, landlords also improve internal separating walls between flats, especially where both noise and heat pass through them.

Tenants dealing with high heating bills caused by long-term vacant properties can bring the matter to their landlord or managing agent. There is no automatic entitlement to compensation, but constructive discussions may sometimes result in steps such as frost-protection heating for empty flats or limited changes to cost allocations within legal limits.

Key terms that help make sense of the problem

Two technical concepts commonly feature in discussions of neighbour-related heating problems.

Transmission heat loss is the energy lost through parts of a building such as walls, ceilings, windows and floors. Losses increase where the temperature difference across a surface is larger and its insulation is poorer.

Thermal bridge means an area of a building through which heat escapes more readily, including concrete beams and inadequately insulated corners. Flats beside an empty unit can experience such bridges along shared structural components connecting warm and cold spaces.

Understanding these terms makes the experience of “heating for the neighbour” less mysterious: it is straightforward physics. In shared housing, that physics can be managed, but never completely eliminated.

What future energy policies could change

As governments seek to reduce emissions and make energy use fairer, regulators are looking more closely at how costs are allocated in multi-unit buildings. Digital heat meters, real-time feedback on consumption and stronger insulation standards all form part of this development.

Some energy economists support clearer requirements for minimum temperatures in rented flats, alongside a duty for landlords to maintain vacant homes at a protective base level. This could limit severe cold spots and the resulting chain of additional costs and damage risks for neighbouring residents.

Until that happens, tenants and owners in shared buildings must live with a fundamental fact: neighbours share more than a roof and staircase. They also share the physics of heat – whether or not the radiators are switched on.