How to Repair Double Glazed Windows

Double glazing that is draughty or difficult to open or has sagged, dropped or sagged might require repairs. Hinges mechanisms, handles, and seals can all be repaired or replaced by a qualified tradesman.

It is possible to perform some repairs yourself but it can be time-consuming than having a professional do it for you. It is also safer.

1. Broken Panes

Double pane windows rely on the space between them to create an airtight seal. This keeps warm air inside and the cold outside. This seal can become damaged when exposed to extreme temperatures or a physical impact. This is why it's crucial to repair cracks in double pane windows as soon as they begin to appear. A small crack can get worse over time, leading to a broken double pane window.

It's best to contact an expert if you've got a broken window. They'll be able to locate a replacement window that fits your frame. They'll then install the new window and ensure it's secure. It's also important to remove the old putty and glazing points prior to installing windows.

Wearing protective eyewear and gloves is recommended for this job. To remove the old putty, use the paint scraper using the pull-type or an old chisel. To ensure that the putty doesn't crack, you can hold a heat gun over it to gradually soften it. After the putty is removed, you will have to clean the grooves and sand them. You can then apply silicone caulk for durability.

It is best to purchase an entirely new window glass from your local hardware or home improvement store. Measure the width and height to determine what size window you need for your home. Make sure you subtract 1/8 inch from all sides, so you will have the exact measurements required for the replacement window. You may end up with windows that don't fit properly and expose your home to elements.

2. Condensation

Many owners of double glazing will experience condensation at some point in the lifespan of their windows. It is typically caused by an absence of air circulation or humidity problems which can cause cold surfaces like windows to draw moisture. This is especially a problem in bathrooms where excess steam can flow through the window, and cool to form condensation.

This moisture could cause heat loss from your home, which could increase your energy costs. If this condensation is left untreated, it can cause mould and damp in your home.

Open your windows every day in the morning, unless it's extremely cold. and make sure you have the trickle vents in place when you leave. You can also use a dehumidifier at home to absorb excess water and stop it from forming on cold surfaces, like your double-glazing.

In more serious cases, you may need to replace your double glazed windows completely in the event that the seal between the two panes is broken. This is a costly fix but it will make your home or building efficient in energy use and also warmer. If you've had double-glazed windows installed, make sure to see if they are still covered under warranty, because this means that the windows will be replaced at no cost by the installers. Avoid trying DIY fixes for condensation as this could be a violation of your warranty.

3. Leaks

If you notice drops of water or a mist between your double glazing panes this could be an indication that the seals are not working correctly. It doesn't suggest that you need to replace the window. It is fixable by replacing the caulking.


The most common cause of this issue is the fluctuating temperatures that cause the frames of double-glazed windows and doors to expand and contract. This can result in gaps in the frame, which could eventually allow water into the home.

Another reason is that, over time, the gas that insulates the window may be dislodged, which could result in a draft and allow moisture to enter the home. If you notice that your double glazed windows are becoming difficult to shut or open and are unable to close, then wiping them down with cold water can temporarily solve the issue until warmer weather is back.

The majority of double-glazed doors and windows are covered by a guarantee from the company that installed them. If you have any problems with double glazing covered by this guarantee, get in touch with them as soon a possible. It is best to do this via phone or in person, and then followed up by an email describing the problem and the date at which it first became apparent. This will help avoid confusion in the future if there is a dispute over what is or isn't covered under your guarantee. It will also ensure that your complaint is taken seriously by the company that carried out the work. If you've not received a satisfactory answer from the company who sold you your double glazing, it could be worth looking for an alternative tradesman recognized by Checkatrade.

4. Hardware damaged

A double-glazed window consists of two glass panes separated with spacer bars and a gap that is filled with an insulating gas. It is encased in a frame of aluminum, uPVC, or wood. Over time the hardware can become loose. A window or door that will not open is a frustrating issue.

The cost of replacing a double-glazed window can be expensive. Window repair companies charge between $50-$80 an hour to take out and replace the window. The price is based on the size, thickness, and shape of the window as well as quality and design of the frame and sash. The price will also be impacted by the type of window used, single or double hung, or sliding. Repairing windows that are higher or require roof access may be more expensive as the technician will require extra safety equipment and precautions.

When a double glazing window is repaired, the installer will clean the surface of the new pane before sealing it. They will then apply a small amount of silicone around the edges to ensure the seal is water-tight. This is particularly important for windows that are located on the ground of a structure, as condensation may build up in the frame's bottom.

Another method to ensure your windows look good is to paint them regularly using the highest quality paint. This will keep them looking new and shiny for longer, and shield them from UV rays. Double-glazed windows also make your home more quiet and improve its value when sold by making it more energy efficient and comfortable for potential buyers to live in.

5. Glass that is damaged

Double-glazed windows are designed to provide insulation for your home and keep cold air out and warm in. This helps reduce the amount of sunlight that enters a space and protects your furniture from damage caused by the sun. But sometimes, glass can get broken. Perhaps a pebble bounces off a lawnmower or a strimmer and cracks the pane. Or maybe a kid throws a ball against it or a collision occurs. Whatever the cause an unbroken window could cause a lot of inconvenience.

A cracked or damaged pane can be repaired with epoxy or similar products. Before applying the new epoxy, it is necessary to clean and eliminate the old putty. This can be done using a cotton rag soaked in linseed oil or the heat gun to soften and loosen the putty. Then, you can scrape away the splintered glass and cut the edges to remove any traces of old putty from the frame.

Apply the epoxy to the crack and spread it across the entire surface. Press it down firmly, pressing it into the crack. Let the epoxy dry completely before putting in the new pane. Make sure that the replacement is a similar size to the original. If you are replacing a leaded glass panel, be sure to bend the H-shaped lead back over it.

If lock repair glasgow at ease with DIY window repairs or if your windows are damaged beyond repair, it is best to hire a professional. Fortunately, it is easy to find a skilled and dependable tradesperson using the online service Checkatrade. Enter your postcode along with the details of the project and you'll be connected in a matter of minutes with local experts.