Why Basement Windows Start to Leak

Basement windows sit low to the ground, making them one of the first places water will find if it is pooling outside. Rain, melting snow, clogged gutters, and poor grading can all push moisture toward the foundation. Over time, even a well-installed window can start to show wear.

Leaks often happen because of:

• Cracked or damaged window frames
  
• Gaps forming between the window and the surrounding wall
  
• Clogged or broken window wells
  
• Soil shifting around the foundation
  
• Old seals breaking down
  
  

Once water finds a way in, it doesn’t take long for small leaks to turn into bigger problems.

Signs Your Basement Windows Are Leaking

Not every leak will show up as a puddle. Some signs are easier to miss if you are not checking regularly. Catching these early can help you avoid major repairs later.

Watch for:

• Stains or peeling paint around the window
  
• A musty smell near the window or on the lower walls
  
• Mold or mildew starting to form
  
• Condensation trapped between window panes
  
• Soft or wet window sills
  
  

If you notice any of these, it’s a good idea to have the area checked before the next heavy rain.

What to Do If You Notice a Leak

If you see water coming in through a basement window, don’t panic—but don’t wait either. A quick first step is to block the leak temporarily using towels or cloths to help control the water and prevent it from spreading. If the leak is larger, placing a bucket or container underneath can help minimize damage until help arrives.

Once you’ve contained the water as best you can, the next step is to have the area professionally evaluated. That’s where we come in. Our team at Advanced Basement Waterproofing will inspect the window, the seals, and the area around it—both inside and out—to find out exactly where the leak is starting.

Depending on what we find, we may:

• Seal the window using professional-grade waterproof materials
  
• Replace damaged or cracked frames
  
• Install or clean out window wells and drains
  
• Improve drainage around the foundation to prevent future leaks
  
  

We focus on fixing the problem at the source so it doesn’t return the next time it rains.

How Advanced Basement Waterproofing Can Help

At Advanced Basement Waterproofing, we know how important it is to stop leaks before they lead to bigger problems. Our team takes the time to check both the window and the area around it, inside and outside, so we find exactly where the water is getting through.

We specialize in Water Sealing and Basement Window Sealing, which means we:

• Remove old, failing seals
  
• Apply high-quality waterproof materials designed for long-term protection
  
• Check and improve drainage if needed
  
• Suggest additional fixes, like window well covers, if they will help
  
  

Our goal is not just to patch the leak, but to prevent it from coming back.

Keep Water Where It Belongs

A leaking basement window can seem small at first, but over time, even minor leaks can lead to mold, damaged walls, and a musty basement. Taking care of it early with the right repair makes all the difference.

If you’ve noticed any signs of leaking, reach out to Advanced Basement Waterproofing. We’ll inspect the area, explain what’s happening in clear terms, and offer real solutions that fit your home.

Stop water at the source—and protect your home for years to come.

Common Questions