Mould in Prague Apartments: Causes, Prevention and Responsibility

Condensation and moisture before winter

Wet windows in the morning or dark patches in corners can indicate a moisture problem. Before winter, checking these details helps landlords and tenants recognise conditions that need attention. Mould in Prague apartments involves the condition of a home, everyday habits and property maintenance.

Condensation forms when moisture meets cold surfaces. However, a visible patch alone cannot establish where the problem comes from or identify its underlying cause.

Causes: everyday habits and building defects

According to the Czech National Institute of Public Health, SZÚ, moisture can result from water infiltration, leaks or thermal bridges. Cooking, showering and drying laundry also release moisture into the air.

When ventilation is insufficient, this moisture can accumulate. Inadequate or irregular heating can contribute to the problem. Before deciding how to respond, it is therefore important to distinguish building conditions from the way the apartment is used.

Step one: inspect and document

Check windows, corners, external walls and areas behind furniture. Limited air circulation can encourage mould growth in these locations.

Photograph visible patches and record where they appear. Also check whether they return after cleaning. Reporting the problem in writing to the landlord or property manager helps document the situation and organise an assessment. These observations should support an investigation rather than establish responsibility from appearance alone. Clear records also make it easier to explain how the situation develops.

Step two: ventilate and heat regularly

Preventing mould in Prague apartments involves paying attention to ventilation and heating. Airing rooms and maintaining regular heating helps limit conditions that favour condensation and moisture.

Consider the moisture produced by cooking, showering and drying laundry. Improving everyday habits can support prevention, but cannot replace an assessment of possible building defects. Removing visible mould does not necessarily eliminate its underlying cause.

Is the landlord or tenant responsible?

Responsibility depends on the source of the problem. Addressing property defects generally falls to the landlord. If mould results from improper use, such as insufficient ventilation or heating, the tenant may be responsible.

The cause must be established, with a technical assessment where necessary. Tenants must report defects promptly and allow necessary repairs. Clear communication helps both parties organise maintenance and address the problem.

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Sources:

SZÚ — Causes and prevention of mould in residential environments

MMR — Landlord and tenant rights and responsibilities