Condensation on windows is a common problem in many homes, especially during the colder months. Fogged-up windows may seem harmless, but condensation can lead to bigger problems if left untreated. Luckily, there are a few simple fixes you can try at home.
In this guide, we examine what causes condensation on windows and share some quick-fix tips for stopping it. We’ll also uncover some long-term solutions and provide guidance on when it may be necessary to seek professional help.
Ready to de-fog those windows and wipe away your worries once and for all? Let’s dive in! This guide covers:
What is condensation, and what causes it?
8 Simple fixes for condensation on windows
How to stop condensation on windows: long-term solutions
Why is it important to stop condensation?
When to call in a JustFix professional
What is condensation, and what causes it?
Put simply, condensation is water droplets forming on a surface. It happens when warm, moist air meets a cold surface, like your window glass or a mirror. The moisture in the air cools down when it hits the glass, so it turns into liquid and makes the glass look foggy and wet with droplets.
Think about how a cold drink looks on a warm day. When an iced drink is left in the sun, the outside of the glass quickly becomes covered in droplets. A similar thing can happen to your windows; droplets form because of temperature differences.
You might notice condensation more during the winter. This is because it’s often cold outside but warmer in your home, creating the contrasting conditions that condensation loves.
Common causes of condensation
There are a few reasons why condensation might be on your windows. Here are the most common causes of condensation:
1. High humidity
Daily activities like cooking, showering, drying clothes indoors, and even breathing all contribute to indoor humidity. When humidity increases, moisture is more likely to build up on cold surfaces like windows.
2. Temperature differences
Condensation increases during winter when the air outside is cold and the heating is on. The significant temperature difference between inside and out creates the perfect environment for condensation to form.
3. Poor ventilation
Rooms like bathrooms and kitchens are prone to condensation because of the moisture created through daily use. Without good ventilation, this moisture has nowhere to go, so it collects on the windows instead.
4. Single-glazed or poorly insulated windows
The glass on single-glazed windows is more susceptible to the cold, meaning that the temperature difference between inside and outside is more extreme. As a result, condensation is more likely to collect on the interior window.
8 Simple fixes for condensation on windows
Condensation is an inconvenience that can also lead to more serious problems like mould and poor air quality. Luckily, there are some straightforward steps you can take to tackle the problem. These methods are easy to implement and can make an immediate difference:
1. Wipe it away
The simplest solution is to wipe condensation away with a dry microfibre cloth, a squeegee, or a window vacuum. Although this won’t stop condensation from occurring, it prevents water from pooling on window sills and causing further damage to paint or woodwork. It also reduces the chances of mould building up in humid spaces like bathrooms.
2. Invest in a dehumidifier
A dehumidifier is one of the most effective tools for managing moisture in your home. They draw excess water from the air, lowering indoor humidity levels. If condensation is recurring on the same windows and glass, place your dehumidifier in this area.
From affordable dehumidifiers that are relatively cheap to run to modern models with built-in sensors to maintain a good humidity level, there’s no shortage of options on the market. Although they can be an upfront expense, dehumidifiers can save you money in the long term by preventing more costly issues.
3. Turn on extractor fans
Extractor fans are essential for managing moisture in kitchens and bathrooms. Activities like cooking, showering, and bathing release steam into the air, which collects on cold surfaces like windows, glass, and mirrors.
Always turn on extractor fans when showering or cooking, especially when frying or boiling food. Let the fan run for at least 15 minutes after you finish to ensure all moisture is removed from the air.
4. Use lids when cooking
Using lids when cooking is a simple fix for condensation in your kitchen. Covering pots and pans with lids traps the moisture inside the pot, preventing it from escaping into your kitchen.
Not only does this help reduce condensation on windows, but it also conserves heat and reduces cooking times, saving you energy.
5. Open windows
Opening windows is an easy way to improve ventilation and reduce condensation. It allows moist air to escape and fresh, dry air to circulate inside.
Even during winter, it’s a good idea to open windows for a few minutes at the start and end of each day or when you notice moisture buildup on the glass. Or, if it’s safe to do so, leave your window slightly open all the time to enable continuous airflow.
If you don’t have an extractor fan in your kitchen or bathroom, it’s essential to open windows in these rooms while showering or cooking.
6. Stop drying clothes indoors
Did you know that drying clothes indoors can contribute to condensation on windows? Wet laundry releases water into the air as it dries, which settles on cold surfaces like windows, walls, and ceilings.
Dry clothes outside on a washing line or use a tumble dryer whenever possible. If you must dry clothes indoors, ensure the room is well well-ventilated or place a dehumidifier nearby to help capture the moisture.
7. Leave windows open overnight
Condensation often forms on windows overnight when outdoor temperatures are lowest. Leaving your bedroom windows slightly open while you sleep can improve airflow.
To keep the room warm while preventing condensation, use heavy curtains or blinds to block out draughts while leaving the window open a crack to allow moisture to escape.
8. Use anti-condensation products
Anti-condensation products are designed to reduce or prevent condensation on windows and walls. These products work by making water droplets spread out and evaporate faster. Some options include:
- Sprays: These are easy to apply directly to the glass and create an invisible layer that repels moisture. They’re particularly effective in bathrooms or other high-moisture areas
- Films: Anti-condensation window films add a layer of insulation to the glass, keeping it warmer and less prone to condensation. They are an affordable alternative to replacing single-glazed windows
- Paints: Anti-condensation paint can be applied to walls in bathrooms or kitchens to prevent excess moisture from building up
These solutions can be an excellent short-term fix, especially if condensation is only a problem for your home during the coldest, dampest parts of the year.
How to stop condensation on windows: long-term solutions
Quick fixes like the ones we’ve discussed can help reduce condensation and its negative effects, but for a permanent solution, it’s essential to address the root causes. Here are some ways to prevent condensation from occurring:
1. Upgrade to double- or triple-glazed windows
Double-glazed and triple-glazed windows are designed to reduce heat loss and keep the inner glass surface warmer, which significantly lowers condensation. Upgrading windows isn’t cheap, but it’s a surefire way to reduce condensation, provide long-term energy savings, and warm your home.
Looking for a trusted professional to upgrade your windows? With JustFix, you can find and book a local glazier in minutes!
2. Install or improve extractor fans
Extractor fans are a must for bathrooms and kitchens. These rooms need proper ventilation to handle the extra moisture produced during daily activities. If you don’t currently have extractor fans, install them and ensure they vent to the outside (as opposed to other rooms in your home). If your extractor fans aren’t working correctly, consider getting them repaired or replaced by a qualified electrician.
3. Insulate your home
Insulation is key to reducing cold spots and maintaining a consistent indoor temperature. Loft insulation, cavity wall insulation, and even draught-proofing doors and windows can make a noticeable difference. Well-insulated homes retain warmth, reducing the likelihood of condensation forming on cold surfaces.
For more ways to improve your insulation and heat up your house, read our guide: Why is my house so cold? Causes & fixes for a warmer home.
Why is it important to stop condensation?
Condensation isn’t just an inconvenience; it can cause bigger problems if you ignore it. If left untreated, condensation can:
1. Cause mould and mildew
Condensation creates damp conditions that encourage mould and mildew. This isn’t just unsightly; it can also cause health problems, particularly for people with allergies, asthma, or other respiratory issues.
If you’ve noticed mould spores in your bathroom or kitchen, it’s important to tackle them immediately. Read our guide on how to get rid of mould for expert tips and tricks you can try at home.
2. Damage windows and frames
Excess moisture can damage your windows and window frames, leading to rotting wood, peeling paint, or rust. Repairing and replacing these can be costly and make your home look messy.
3. Reduce air quality
Damp, stagnant air caused by condensation can result in musty odours and poor air quality. This can also cause problems for people with respiratory issues.
When to call in a JustFix professional
If you’ve tried every trick in the book and condensation keeps creeping up your windows, it might be time to call in the pros! Here are some signs you might need to seek help:
- If you notice moisture trapped between the panes of your double-glazed windows, it’s usually a sign of a failed window seal. This condensation can fog up your view and reduce your window’s insulation efficiency. A qualified tradesperson specialising in window repairs or replacements can fix this issue.
- If your windows are single-glazed or poorly insulated, they’re likely a major culprit behind your condensation woes. Upgrading to double-glazing can dramatically reduce condensation while improving energy efficiency. A JustFix glazier can assess your windows, recommend the best solution, and handle the upgrade.
- If you don’t have an extractor fan or yours is broken, find and book a professional electrician to solve your problem. An electrician can install or fix a fan and restore ventilation to your space.
- If condensation has led to widespread mould or mildew—especially if it covers more than one square metre— call in a handyperson. They’ll assess the damage and help restore your space to a safe and healthy condition.
Get in touch
JustFix has a team of qualified tradespeople ready to help with all your home maintenance needs, whether upgrading windows, installing a fan or tackling mould. Simply download the app or use our website to describe the job, and we’ll match you up with a local expert.
Choose a time and date that fits your schedule, and we’ll handle the rest. With a fixed hourly price and a 12-month workmanship guarantee, you can enjoy peace of mind knowing that whatever we fix stays fixed!
Taking action now will protect your home, health, and wallet in the long run. So, start de-steaming today for a clearer tomorrow.
With transparent fixed hourly rates and a 12-month guarantee on all work, you can trust us to get the job done right—no hidden surprises, just reliable service!
