Are your windows constantly misting up? Whether it’s light fog in the morning or a persistent damp patch on the pane, condensation is one of the most common window complaints we hear from homeowners in Bournemouth and across Dorset.
But condensation isn’t always a problem — and when it is, the fix depends on where it appears. In this guide, we explain the 3 types of condensation, what they mean, and how to solve them.
The 3 Types of Window Condensation
| Type of Condensation | Location | Cause | Problem? |
|---|---|---|---|
| Internal | Inside your home, on the glass surface | Warm moist air inside hits cold glass | Can cause damp, mould |
| External | Outside your home, on the outer pane | Common on cold mornings – means your windows are well-insulated | No issue |
| Inter-pane | Between the two panes of double glazing | Failed seal in the window unit | Blown unit – needs glazing replacing |
1. Internal Condensation – Inside the Room
If your window steams up on the inside, it’s usually due to excess moisture in the room – especially in kitchens, bathrooms, or bedrooms.
Common causes:
- Poor ventilation (no extractor fan)
- Drying clothes indoors
- High humidity from cooking or showering
- Lack of airflow near windows
How to reduce it:
- Open trickle vents or windows for 10–15 minutes a day
- Use a dehumidifier in problem rooms
- Add extractor fans in bathrooms or kitchens
- Avoid drying clothes on radiators
- Keep furniture a few inches from walls to allow air circulation
While internal condensation isn’t always a sign of glazing failure, it can cause mould growth and damage window frames if left untreated.
2. External Condensation – Outside the Glass
Seeing condensation on the outside of your double glazing?
Good news – this means your glazing is working.
Modern energy-efficient windows are designed to trap heat inside your home, so the outer pane stays cooler than the morning air, causing temporary mist.
This typically clears by mid-morning and is not a fault.
3. Condensation Between the Panes – The Seal Has Blown
If you can’t wipe the condensation away from either side, it means moisture is trapped between the glass layers — a clear sign of a blown sealed unit.
Symptoms of a blown unit:
- Mist or water droplets trapped inside
- Cloudy or “milky” appearance
- Harder to see through the glass
- Reduced energy performance
You cannot fix this with ventilation – the only solution is replacing the glass unit, not the full frame.
At JCarter, we offer fast, affordable blown unit replacements across Bournemouth and Dorset — saving you the cost of new windows.
Why Condensation Matters
Leaving condensation issues unresolved can lead to:
- Black mould growth on sills and walls
- Health problems (especially for asthma sufferers)
- Damaged plaster or timber frames
- Cold draughts and higher heating bills
- Failed EPC ratings (for landlords or sellers)
Areas We Cover
We diagnose and fix condensation problems across:
- Bournemouth
- Poole
- Christchurch
- Wimborne
- Ferndown
- Southbourne
- Ringwood
- All surrounding Dorset & Hampshire areas
Searching for condensation window fix near me? JCarter’s local glazing team is here to help.
FAQs – Condensation & Windows
Can I just drill a hole in the window to stop the condensation?
No – this will void any warranty, reduce efficiency, and is not a long-term fix. We strongly advise against DIY “condensation kits.”
Does a dehumidifier really help?
Yes – especially for internal condensation. It won’t fix blown units but will help reduce humidity indoors.
Can you replace just the glass?
Yes – in most cases, we can replace just the sealed unit (glass) within your existing frame. This is quicker and cheaper than a full window replacement.
External Resources
- Energy Saving Trust – Reducing Condensation
- Gov.uk – Landlord EPC Requirements
- NHBC – Condensation in Homes
Book a Condensation Assessment Today
Don’t put up with misted windows or unhealthy damp. We’ll identify the cause and provide an affordable fix – whether that’s ventilation, repair, or replacement.
