Why do your windows leak? Window leaks can happen for a number of reasons. Typically, window leaks are due to poorly installed windows or windows that have worn parts—causing a breakdown of sealing components. If your windows are leaking, you have a significant problem. Again, window leakage is more than just annoying—it can cause damage to your home, including mold and mildew growth, wood rot, or even foundation problems! It is true that most people only decide to change windows when their existing ones are completely useless. In that sense, winter is the best time to recognize just how bad of a shape your existing windows are in. The fickle Texas weather really puts them to the test with constantly changing temperatures.

Never ignore leaky windows. If you notice water around your windows after it rains, you should consider having your windows evaluated for repair or replacement.  Our team can assess the condition of your windows and help you determine whether you should simply repair your existing windows or replace them with new ones.

Common Causes of Window Leaks

  • Window Leaks When it is not Raining – many people notice water on their windows even when it is not raining and assume there is a leak somewhere. Chances are it is simply window condensation. 
  • Replacing Leaky Windows
    Leaks like this usually mean there is a problem with the sealed unit in the window.

    Bad Glass Seal – if you are seeing water inside your window between the panes of glass, you have a bad glass seal. This does not always mean that water is leaking into your home, but it does mean that your windows have lost their insulating gas—making them significantly less energy-efficient than they were when they were new.

  • Bad Window Sealant – If the window sealant—or caulk—around your window has cracks or gaps, re-caulk around the window and monitor what happens following the next rain storm.
  • Wall Leaks – it is possible that your window leaks are not window leaks at all. If you notice stains on the top part of the window frame, chances are the leak is due to a leak in your walls. Inspect your walls for sealing gaps or cracks and re-seal them to fix this problem.


Windows That Leak From The Top Of The Jamb

Why Do Your Home Windows Leak

The image to the left perfectly illustrates a window with water leakage as a result of issues with the wall structure. These leaks are often characterized by the appearance of dirty brown circles that are a result of water running down or collecting on the inside of walls, then coming into contact with structural components of the house. This most often doesn’t mean your windows are bad. The problem is usually somewhere higher up in the walls. A replacement installation will definitely offer you but it is still a good idea address the issue at the root and find out where the leak is coming from.

Windows That Leak From The Bottom Of The Casing

Casement Window Leaks

This is another sign of wall structure damage. What happens in these situations is the water comes down the wall on the inside, but because it has nowhere to escape, it ends up running along the edge of the window frame to the bottom. The bottom in older windows is often warped or sagged downward, causing the water to collect and pool toward the middle.

Windows That Leak Between The Window Frame And The Jamb

Window Leaks -Water Leaking Between Window & Jamb

As in the picture above, if the leak comes from between the window frame and window jamb it also means that there is an issue with the wall structure.

Windows That Leak Where The Glass Meets The Frame

Window Leaks - Houston Custom Home Windows

Window leaks are a common issue in aging homes. Remember, although it is coming through your windows, water damage is often a result of bigger structural issues.  With this in mind, professional window installers look for signs of damage or rotting in your frame, in order to prevent or troubleshoot these issues.  But even the best installers don’t always specialize in the work required to properly seal any open areas, as they may be away from the actual window. Regardless of whether your leaks are on new windows or old ones, you should always get them examined in order to figure what the solution is. Simply leaving them as is, may lead to mold growth on your frames, which is dangerous not only to the health of your home, but also damaging to the well-being of its occupants.


The easiest way to prevent your windows from leaking is to ensure that they are installed properly the first time. Always hire a certified and experienced window replacement contractor—like Renaissance where you can rest assured knowing that all of our window installers are certified and actual employees rather than subcontractors.

The next best thing you can do is install windows with superior weather resistance features. Look for windows made with moisture-resistant materials, a fusion-welded subframe, and thick multi-chamber sub frame components—incorporating these features into the windows we sell has virtually eliminated the ability for water infiltration to occur, leaving your home’s windows leak-free for life.


If you would like to have your leaky windows evaluated or replaced our experienced Houston Window Replacement Experts can assess your home’s windows and provide you with a free replacement cost estimate to have your windows replaced with new leak resistant windows. Whether you are looking for wood, aluminum-clad, vinyl-clad, or fiberglass windows, we have an option for you.

Houston Window Replacement - Window Leaks
Window Leaks -Houston Window Replacement Experts

In-Home Consultation

Contact Renaissance Windows & Doors Today To Schedule Your In-home Consultation And Let Our 20+ Years Of Experience Work For You

Speak With An Expert

Not Ready To Set An Appointment But Have A Question For One Of Our Experience Replacement Window Experts? Get In Contact With Us Here. 

Come See Us

Visit Our Houston Showroom Located In The Houston Design Center During Normal Business Hours To See Your Many Options For Replacing Your Leaky Windows. Find Us Here. 

The Renaissance Blog

Check Our Latest Blogs Here. 

Social Media: Join The Conversation

Join The Conversation With Us On Social Media At:



Google +