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      Leaking windows and how to fix them

      07.29.2023 By Brent Beahan Windows

      A leaking window might sound like a minor inconvenience, but for homeowners around the globe, this common problem is far from it. Leaky windows can result in a wide range of issues from unsightly water stains to serious moisture damage within your home. This comprehensive guide will help you understand the common causes of window leaks, how to fix them, and how you can prevent them from occurring in the first place.


      Identifying the common causes of window leaks


      Addressing any problem, whether it’s a leaking window or something else, starts with understanding its root causes. Here are some of the most common causes of window leaks in your home.


      Old windows, wear and tear

      As time passes, your windows inevitably show signs of wear. The window seal may degrade, the frame may crack or rot, and you may suddenly find water ingress where it shouldn’t be.


      Poor installation and improperly installed windows

      Whether it’s new windows or old, poor installation can lead to window leaks. It doesn’t take much – a small leak in the corner of a window frame can let in a surprising amount of rainwater.


      Improper house wrap or window flashing

      Sometimes, the problem isn’t with the window itself but with its surroundings. If your house wrap or window flashing was improperly installed, water can find its way into your house, causing water damage over time.


      Leakage due to window flashing


      Recognising the telltale signs of window leaks


      Window leaks aren’t always obvious. Sometimes, the first signs of a problem aren’t the sight of leaking water but other subtle indicators.

      • Water stains or discolouration around the window area
      • Weep holes blocked by debris
      • Mould growth, which could suggest ongoing moisture damage
      • Window condensation, particularly between window panes
      • Feeling a draft even when the window is closed


      Rolling up your sleeves: how to fix a leaking window


      Once you’ve identified the source of the leak, it’s time to tackle the problem.


      Replacing the seal

      If the problem lies in the window seal, remove the old sealant and apply a fresh layer. Silicone sealants are a good choice as they are waterproof and durable.


      Fixing the frame

      Cracked or rotting window frames require careful handling. Small damage can be filled in, but extensive damage may call for the help of a reputable window company.


      Window installers for design flaws

      If improperly installed windows or a faulty house wrap is causing the leaks, you’ll likely need professional help. Reach out to trusted window installers to correct these issues.


      Leakage due to window design flaw


      Prevention is key: how to avoid leaking windows


      Prevention, as the saying goes, is better than cure. So, how do you prevent common problems like window leaks?


      Regular maintenance

      Make sure to check your windows and the surrounding wall regularly. Keeping an eye on the condition of your windowsill and window panes can help prevent leaks from occurring.



      Taking the time to weatherproof your windows can save you a lot of trouble down the line. Regularly check weep holes to ensure they are not blocked and use window flashing to improve the area’s water resistance.


      Who to call for a leaking window? Types of professionals for window leaks


      When a window leak is beyond a quick DIY fix, it’s time to bring in the professionals. But who to call for a leaking window? Here’s a rundown of the types of professionals who can help:



      For small leaks or minor window repairs, a local handyman might be all you need. They can usually tackle tasks like re-caulking or applying weather stripping, and they might be able to address minor issues with window frames.


      General contractors

      If your leaking window is part of a larger problem, such as extensive water damage to your wall or issues with the house wrap, a general contractor might be the way to go. They can coordinate and handle a wide variety of related repairs.


      Window installation specialists

      If you suspect the issue lies in the initial installation, or if your windows are old and in need of replacement, then a window installation specialist would be your best bet. These professionals are experts in installing windows properly, ensuring that they are both functional and well-sealed.

      Remember, the severity and nature of the leak will often determine who you should call. It’s always advisable to seek a professional opinion if you’re unsure about the extent of the issue.


      Window replacement specialist


      The importance of warranties and services


      Whether you’re buying new windows or getting existing ones repaired, warranties can play a critical role.

      A warranty is a promise from the window company, guaranteeing the quality of their product or workmanship. If your window develops a leak within this warranty period, the repair, or in some cases, replacement, would be done at no charge to you.

      Warranties typically cover defects in the window itself, such as issues with the window seal or frame. Some may also cover the installation process, which could be useful if the leak is due to improper installation.

      As a homeowner, it’s crucial to understand what your window warranty covers. Always read the fine print and ask questions if anything is unclear. Warranties can be a valuable tool in your arsenal when tackling leaking windows.


      The invisible costs of leaking windows


      Leaking windows can lead to a host of problems, including increased energy costs, damage to your house, and a decrease in your property’s value. Investing in proper window installation and maintenance is essential for any homeowner.

      A leaking window may seem like a small issue at first, but if not handled properly, it can lead to much more serious problems. With regular inspection, timely maintenance, and a little bit of know-how, you can prevent leaks and protect your home.

      If you’ve got a problem with a leaking window and are looking to tackle the problem head-on – contact WA Custom Glass for all of your retrofit or renovation needs. As your trusted window and door specialists, we offer guarantees and warranties on all of our products and services, giving you peace of mind when it comes to our workmanship and the longevity of your new windows or doors. Explore our range of windows, or, contact our friendly professionals for a free quote and consultation, today!

      Brent Beahan

      Brent Beahan

      Brent is a highly experienced General Manager in the glass and glazing industry, with an impressive 20+ year career under his belt. Having earned a Certificate III in Glass and Glazing and the esteemed title of Master Glazier, Brent possesses a wealth of knowledge and expertise in the field. As General Manager, his role involves overseeing all company departments, including Production, Supply, Sales, Scheduling, and Installations. His creativity, knowledge and passion for glass exemplify him as a leader in the industry.

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