Damp / mould / condensation / condensation
Why are my windows wet every morning?
Start with the observable symptom. This page explains possible causes; it is not a diagnosis. It covers both “mould” and “mold” wording for the same intent.
Wet windows every morning usually point to overnight condensation: indoor moisture has collected on cold glass or frames. Persistent wetness, mould or damage around the window means you should check ventilation, insulation and possible water entry rather than only wiping the glass.
Start with the pattern.
Water is present on the inside of the glass, sill or frame most mornings.
Possible causes, not a diagnosis.
- Humidity rises overnight while windows and frames cool down.
- Curtains, blinds or furniture are trapping moist air against the glass.
- A failed seal or external defect may be letting water in if the moisture is between panes or follows rain.
Check what is safe to observe.
- 01
Confirm which side of the glass is wet and whether it occurs after rain.
- 02
Check vents, extractor fans and the airflow around the window.
- 03
Inspect the sill, seals and nearby paint for staining or softening.
Take the smallest useful step.
- Dry the sill and frame each morning and avoid leaving pooled water.
- Ventilate the bedroom briefly and keep vents clear.
- Leave curtains or blinds positioned so air can move across the glass.
- Do not treat recurring pooled water as normal housekeeping forever.
- Do not use bleach or paint to hide mould around a window.
- Report repeated wetness and any mould or damage to a landlord or housing provider.
- Use a window or damp professional when water is between panes or enters during rain.
Professional requirements and rental responsibilities vary by location. Use the qualified local professional or housing authority that applies where you live.
UK example: GOV.UK repairs guidanceWhy this page says that.
This page separates an observable symptom from possible causes and keeps the recommended action within a safe household boundary.