How to Stop Damp and Condensation in a Rented Flat
Condensation, damp and mould are top renter complaints. How to cut moisture at the source, improve airflow and treat the causes without building work.
condensation is the number one renter grievance for a reason: modern flats are sealed tight, everyday life pumps moisture into the air, and with nowhere to go it settles on cold windows and walls as damp and then mould. The encouraging part is that you can fix almost all of it with habits and plug-in kit, without touching the fabric of a home you do not own.
What causes condensation and damp in a flat?
Most damp in a flat is condensation, not a leak. Cooking, showering, drying laundry indoors and simply breathing release litres of water into the air each day. When that warm, moist air meets a cold surface such as a window, an outside wall or a cold corner, the water condenses out as droplets, and if it cannot dry it feeds black mould. True penetrating or rising damp exists but is far less common, and it is the landlord's responsibility to fix, so report it if you suspect it.
How do you reduce moisture in the air?
Attack the moisture at the source:
- Dry washing on an airer with a dehumidifier running, not draped over radiators or across the room
- Use the extractor fan and open a window while cooking and showering, and keep lids on pans
- Close the bathroom or kitchen door while moisture is being made so it does not spread through the flat
- Wipe condensation off windows and sills each morning before it soaks in
- Keep rooms gently and evenly heated rather than blasting heat then letting them go cold
Does a dehumidifier stop condensation?
Yes, and it is the most effective single device for it. A dehumidifier pulls excess water out of the air before it can settle on cold surfaces, so windows stay clear and mould loses the damp it needs to grow. A 12L model with a laundry mode is ideal for a flat, because it also handles the big moisture spike from drying clothes indoors. Because it just plugs in, it needs no permission and moves with you.
How do you get rid of existing mould?
Treat visible mould promptly and then keep the room dry so it does not return. Wipe small patches with a proprietary mould remover or a mould-killing spray, wearing gloves and ventilating the room, and wash affected soft furnishings if you can. The key is that cleaning alone is temporary: unless you also cut the moisture with ventilation and a dehumidifier, the mould comes back. If it is widespread or keeps returning despite your efforts, report it to your landlord, as persistent damp can be a disrepair issue.