There’s something comforting about watching rain or frost gather outside during winter. But when that cold weather starts fogging up your windows on the inside, it’s more than a seasonal inconvenience. If you’re wiping down glass every morning or noticing moisture building up on sills and frames, your home may be experiencing winter condensation, and it could be a sign of deeper issues.
This article explains how to stop condensation on windows, especially during winter, by unpacking what causes it, why it matters and what you can do to prevent it. Whether you’re a homeowner, strata manager or commercial property owner, we’ll walk you through short-term fixes and proven long-term solutions that keep your windows dry, clear and efficient.
What causes condensation on windows in winter
Condensation occurs when warm, humid air inside your home meets the cold surface of a window. The greater the difference in temperature between inside and outside, the more likely moisture will form. During winter, that temperature contrast increases significantly, making condensation on windows far more common.
This effect, commonly referred to as window condensation, happens when warm air indoors collides with a much colder glass surface, creating water droplets that collect and drip down.
Common causes include:
- Excess indoor humidity from cooking, showering or drying clothes
- Poor airflow and ventilation
- Cold single glazing or older windows with poor insulation
- Blocked vents or sealed homes that trap air
- Damaged or missing weather stripping
In areas like the kitchen and bathroom, where moisture production is naturally higher, the chances of condensation forming increase substantially.
Even newer homes can experience condensation if insulation and airflow aren’t properly balanced or if humidity levels are not controlled throughout the day.
Why winter condensation is a problem for windows and doors
A little condensation might seem harmless, but regular moisture build-up can lead to long-term problems, especially for older windows and timber-framed doors. Moisture left untreated can create the ideal environment for mould and mildew, while repeated exposure to water can degrade internal finishes and cause structural damage.
Issues caused by winter condensation include:
- Mould and mildew growth around window frames
- Paint peeling or plaster damage on the surrounding walls
- Timber frame swelling or rot
- Degraded seals and weather stripping
- Damp or musty air affects indoor air quality
- Increased maintenance for shared or strata-managed properties
Over time, the presence of moisture can affect both comfort and building integrity. For many property owners, the goal is not just to treat but to prevent condensation from occurring in the first place.
Quick fixes vs long-term solutions
If you’re wondering how to stop condensation on windows quickly, there are a few temporary measures you can try. These short-term fixes help reduce moisture but don’t solve the underlying cause.
Quick fixes:
- Use a dehumidifier in high-moisture rooms
- Open windows briefly to allow air exchange (when safe to do so)
- Turn on exhaust fans while cooking or showering
- Leave internal doors open to improve airflow
- Wipe down the glass daily to prevent water damage
- Apply temporary weather stripping or insulation film
If used effectively, these strategies can help stabilise humidity levels and slow the rate of condensation forming on interior glass surfaces. However, it’s important to understand that these are temporary measures, not permanent solutions.
Many homeowners attempt to manage window condensation on their own using DIY fixes, hoping that dehumidifiers or regular wiping will be enough. While these efforts may reduce surface moisture in the short term, they rarely address the core issue—cold, poorly insulated glazing that allows warm air to condense on glass.
In some cases, DIY attempts can make the situation worse. For example:
- Over-relying on ventilation may lead to heat loss in winter
- Inadequate or poorly applied weather stripping can trap moisture inside the frame
- Wiping condensation regularly does not prevent water droplets from seeping into timber sills or plaster, leading to long-term water damage
- Using insulation film may fog up or degrade over time, especially on older windows
Even homes that appear well-sealed can experience problems if internal humidity levels are not managed in conjunction with high-performance glazing. And once mould or frame swelling begins, DIY methods are no longer effective.
For lasting comfort and protection, the best course of action is to invest in permanent, professionally installed solutions, particularly in climates like Perth, where seasonal shifts can be extreme. Retrofitting modern glazing or upgrading to double-glazed windows will resolve the actual cause of the issue, not just the symptoms.
Upgrade to double or low-e glazing
One of the most effective long-term ways to stop condensation is upgrading to double-glazed or Low-E glass. These modern glazing options improve insulation, helping your windows retain internal warmth and stay above the dew point that causes moisture to form.
Benefits of double or low-E glazing include:
- A warmer internal glass surface that reduces condensation
- Improved energy efficiency and reduced heating costs
- Noise reduction and UV protection
- Increased year-round comfort and visibility
- Reduced reliance on dehumidifiers or ventilation systems
Double-glazed windows are especially effective at stabilising internal temperatures and minimising the build-up of water droplets caused by indoor humidity levels.
Even if you already have double glazing, upgrading older or poorly performing units can dramatically improve performance in winter conditions.
Retrofit solutions for existing homes and buildings
You don’t need to renovate your entire home to solve a condensation problem. A professional retrofit allows you to replace or upgrade your window glazing with modern, thermally efficient systems without disrupting your existing structure.
Retrofit solutions offer:
- Fast installation with minimal building work
- Compatibility with heritage or strata design restrictions
- Upgrades for windows and doors of any size or shape
- Modern seals and drainage that reduce the condensation risk
Retrofitting is a smart way to prevent condensation on older frames, particularly where window condensation has already led to interior damage or mould concerns.
Retrofit glazing is ideal for homes, strata properties and commercial spaces needing a cost-effective, permanent improvement.
Strata and commercial property considerations
Condensation doesn’t just affect single homes. In strata-managed buildings or commercial premises, condensation can be a widespread issue that impacts shared infrastructure, tenant comfort and long-term maintenance costs.
Key considerations include:
- Consistent performance across multiple units
- Minimal disruption to tenants or operations
- Customisable solutions that meet regulatory or visual requirements
- Coordinated upgrades that address recurring maintenance complaints
- Increased energy efficiency and reduced heating expenses for building owners
Whether you’re retrofitting a single office or multiple flats, addressing condensation forming across shared walls and common areas is essential to long-term asset protection.
Choosing the right partner for these upgrades is essential to achieving a compliant and effective result.
The professional solution to winter condensation
Persistent condensation is more than just a seasonal annoyance. It’s a sign that your current windows aren’t insulating or ventilating effectively, particularly during cold weather. Temporary fixes may help reduce the symptoms, but long-term comfort comes from upgrading the window system itself.
WA Custom Glass is WA’s first AGGA-accredited glazing company, offering:
- Custom retrofit glazing for homes, strata and commercial buildings
- High-performance double-glazed and Low-E glass solutions
- Weather-resistant installation techniques
- Full compliance with building codes and strata requirement
- A 10-year warranty on all products and installation
- Locally manufactured glass, including trusted partners like Jason Windows
Our experienced team can assess your current windows and provide a solution tailored to your building, budget and lifestyle.
Book your free quote today
Say goodbye to foggy glass and hello to clearer, warmer windows this winter. Contact WA Custom Glass for a free consultation and discover the best long-term solution for your home or building.
Call today or request your free quote online.
