Mould around windows is a common issue in many homes, especially during cooler months or in rooms with poor ventilation. It often appears as dark spots on window frames, surrounding walls, silicone seals or internal reveals.
While mould can affect the appearance of your home, it may also indicate excess moisture, condensation or poor airflow. The good news is that the problem can usually be managed — and in many cases prevented.
For homeowners in Sydney, upgrading to a quality double glazed window system can also help reduce condensation and improve indoor comfort.
Why Does Mould Appear Around Windows?
Mould grows where moisture is present for extended periods. Windows are common problem areas because they are exposed to temperature differences between indoor and outdoor air.
Typical causes include:
- Condensation on glass or frames
- Poor room ventilation
- High indoor humidity
- Drying clothes indoors
- Steam from bathrooms or kitchens
- Water leaks around frames
- Cold surfaces in older windows
- Inadequate installation or sealing
When moisture remains trapped, mould spores can settle and grow.
Why Older Windows Often Experience More Problems
Older single-glazed or poorly sealed windows are more likely to create cold surfaces where condensation forms.
This can lead to:
- Water droplets on glass
- Damp reveals or plaster
- Frame deterioration
- Mould around corners or seals
Modern double glazed window systems are designed to improve insulation, helping reduce internal surface condensation.
Why Sydney Homes Can Be Affected
Homes in Sydney may experience mould around windows due to a combination of factors such as:
- Humid coastal air
- Seasonal temperature changes
- Closed windows during winter
- Bathroom steam
- Laundry drying indoors
- Limited airflow in apartments
Even modern homes can develop mould if moisture levels remain high.
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How to Remove Mould Around Windows Safely
If mould is already visible, early treatment is recommended.
Basic cleaning steps:
- Wear gloves and ensure good ventilation.
- Wipe affected surfaces with a suitable mould cleaner or mild vinegar solution.
- Dry the area thoroughly.
- Dispose of used cloths safely.
- Monitor the area for return growth.
Avoid mixing chemicals or using harsh abrasive products on window frames.
If mould is extensive or repeatedly returns, professional assessment may be the best option.
How Double Glazed Windows Help Reduce Mould Risk
A quality double glazed window can help by reducing cold internal surfaces where condensation usually forms.
Benefits include:
- Better thermal insulation
- Reduced condensation build-up
- Improved comfort in winter
- Better energy efficiency
- Less moisture around frames
- Quieter indoor spaces
While no window can eliminate mould alone, better-performing windows are an important part of the solution.
Tips to Prevent Mould Around Windows
Improve Ventilation
Open windows regularly and use exhaust fans in kitchens, bathrooms and laundries.
Control Indoor Humidity
Use a dehumidifier if needed and avoid drying washing indoors without airflow.
Wipe Condensation Early
If water appears on glass, dry it promptly.
Keep Air Circulating
Avoid blocking windows with heavy curtains or furniture.
Check Seals and Frames
Inspect windows for leaks, damaged silicone or drainage issues.
Upgrade Old Windows
Replacing outdated windows with modern double glazed window systems can significantly improve performance.
Why Choose Prestige Plus
Prestige Plus supplies premium uPVC double glazed window systems designed for Sydney homes. Our products combine energy efficiency, comfort and modern style with professional local installation.
Benefits include:
- Improved insulation
- Reduced condensation risk
- Noise reduction
- Low maintenance frames
- Stylish modern finishes
- Expert installation across Sydney
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Contact us today to find out how Prestige Plus specialists can help you solve your problem
FAQ
Why is mould growing around my windows?
Mould usually appears because moisture is collecting around the frame, wall or seals due to condensation, leaks or poor ventilation.
Can double glazed windows stop mould completely?
No window can guarantee zero mould, but a quality double glazed window can help reduce condensation and lower the risk.
Are old windows more likely to cause mould?
Yes. Older single-glazed or poorly sealed windows often create colder surfaces where moisture forms more easily.
Is mould around windows common in Sydney?
Yes. Humidity, coastal conditions and seasonal weather changes can contribute to mould problems in Sydney homes.
How do I clean mould off window frames?
Use an appropriate mould cleaner or mild vinegar solution, then dry the area thoroughly.
Why does mould keep coming back?
Recurring mould usually means the moisture source has not been resolved.
Can poor ventilation cause mould?
Yes. Without airflow, moisture stays trapped indoors and creates ideal conditions for mould growth.
Which rooms are most at risk?
Bathrooms, laundries, kitchens and bedrooms with limited airflow are common problem areas.
Do uPVC windows resist mould better?
uPVC frames are low maintenance and moisture-resistant, making them easier to clean and maintain.
Where can I buy double glazed windows in Sydney?
Prestige Plus offers custom double glazed window solutions across Sydney and surrounding areas.
