Stop bedroom condensation by fixing airflow, moisture sources and damp spots in one focused session.
CC-01Check the room first thing in the morningLook at the windows, window sills and any external walls before you open anything or turn on heating. Note where water is pooling, where the walls feel damp to the touch, and any black speckled mould in corners or behind furniture. This tells you where the cold spots are and where moisture is landing.
CC-02Open a window for 10–15 minutesOpen the bedroom window fully for 10–15 minutes, ideally straight after getting up and again before bed. This swaps warm, moist air for drier outside air, even in winter. Close it again afterwards so you don't lose too much heat.
CC-03Open the trickle ventsCheck the top of the window frame for a small slotted trickle vent and make sure it's open, not painted or taped shut. These are designed to let a small amount of air through constantly without you noticing a draught. If yours are stiff, work them gently rather than forcing them.
CC-04Cut moisture at the sourceNever dry wet laundry on radiators or airers in the bedroom — a full load of washing can release several litres of water into the air as it dries. Keep the bedroom door closed while cooking or showering elsewhere in the house, so that moist air doesn't drift in and cool on the bedroom's colder walls.
CC-05Pull furniture away from cold wallsMove wardrobes, headboards and chests of drawers so there's at least 50mm of gap between the furniture and any external wall. Pushed-tight furniture blocks air movement, and that cold, still pocket of air is exactly where condensation and mould build up unseen.
CC-06Check the bathroom and kitchen extractor fansGo to the bathroom and kitchen and run each extractor fan for a minute — you should feel a decent pull of air, not a weak flutter. A poorly performing fan lets moist air spread through the house instead of venting outside, and that ends up on your bedroom windows and walls.
CC-07Wipe down condensation dailyEach morning, wipe standing water off the window glass and sill with a microfibre cloth before it soaks into the wood or plaster. Wring the cloth out rather than leaving it damp on the sill. Doing this for a week or two while you fix the ventilation stops new mould getting a foothold.
CC-08Treat any existing mould spotsOpen the window, put on gloves, and spray fungicidal mould wash directly onto affected patches of wall, sill or frame. Leave it for the time stated on the bottle, then wipe off with a disposable cloth — don't scrub dry, as this flicks spores into the air. Bag the used cloths and gloves straight away.
CC-09Add a dehumidifier if the room stays dampIf condensation keeps coming back despite better ventilation, run a small electric dehumidifier in the bedroom overnight, especially in winter. Empty the water tank each morning — a genuinely damp room can fill it in a single night. This is a sticking-plaster fix, not a replacement for sorting out ventilation.
CC-10Track humidity with a hygrometerLeave a small digital hygrometer on a shelf or windowsill in the bedroom for a week. Aim to keep the reading between 40% and 60% — above that regularly, and condensation and mould will keep coming back. It gives you a plain number to check progress against instead of guessing.
CC-11Tidy up and keep an eye on itWash any reusable cloths separately on a hot wash, and bin disposable gloves and cloths that touched mould. Keep the window and trickle vent habit going daily — condensation control isn't a one-off job, it's a routine. Check the room again after a week to see if the damp patches have dried out and stayed gone.
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