Basement Window Leak Repair in Virginia, the District of Columbia, and Maryland

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Professional solutions for leaking, flooding basement windows

Water will find its way into your basement in any way it can. Even if you seal off your concrete walls and install a perimeter drain, leaks can still occur through a variety of possible ways.

One of the most common ways that water floods into a below-grade space is through your basement windows. The experts at NV Waterproofing & Foundation Repair can help prevent these issues in your home. Call us today for a free estimate on leaky window repair services in Greater Washington D.C.!

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Why do windows leak?

Basement windows are most often made using inexpensive steel or wood frames. As these materials age, they will begin to break down, showing signs of rust, corrosion, and decay.

As the frames break down, the window panes begin to hang more loosely, and the frame itself begins to hang loosely in its opening in your basement wall.

Along with becoming a leaking issue, these windows will also become drafty. As your home loses conditioned air, your energy costs will rise.

Fortunately, basement window leaks can be fixed quickly, easily, and permanently by draining any leaking water into your perimeter drainage system.

Prevent future leaks with our basement window sealing system.

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Steps to install the WellDuct® System

We fix leaking basement windows with the WellDuct® Basement Window System to redirect flooding to a perimeter drain or drywell. During installation, our technicians follow these four simple steps:

  • Install a perimeter drain or drywell

    Step 1

    At NV Waterproofing & Foundation Repair, we recommend that water from your WellDuct® is directed into a French drain system. Otherwise, a small drywell can be created beneath the leaking window. If your problem is a leaking crack beneath your window, no hole will need to be created.

  • Create a drainage channel

    Step 2

    The installer will create a small hole in the wall — just underneath the window. If you have block walls, a PVC pipe will be installed in this hole and a grated opening will be installed on the outside of the pipe to help prevent clogs. A polymer will be injected around the outer edge of the pipe to help keep it sealed and in place.

  • Direct water into your perimeter drainage system

    Step 3

    A gray plastic fitting will be placed on your inside basement wall, directing water down into your perimeter drain or drywell. The top of the drain will be sealed off with a polymer injection. Plastic pegs mechanically attach the plastic fitting to your walls.

  • Seal the drain

    Step 4

    The edges of the plastic fitting will be sealed to your wall with a polymer injection. Once the workplace is carefully cleaned, your installation is complete!

Basement window maintenance

Like most things in your home, your basement windows do better with a little maintenance. While your window will still probably leak at some point in the future without a WellDuct®, here are a few things you can do to help keep water to a minimum:

  • Routinely clean out dirt, leaves, and other debris from your window wells.
  • Keep your gutters clean so runoff water does not pool around your windows.
  • Grade the soil around your home so it is sloped away from your windows — and the rest of your foundation.

It’s also worth noting that keeping a window well free of dirt, leaves, and similar debris is a good way to help prevent pest infestations. Ants, termites, and more will often build their nests in debris near a home and expand from there into your home.

Call or e-mail us today for a free waterproofing quote in Alexandria, Washington D.C., Arlington, Germantown, Gaithersburg, Silver Spring, Bethesda, Sterling, Fairfax, Ashburn, and the nearby areas in Virginia, the District of Columbia, and Maryland!

Old basement window frames easily rust and rot. Combine them with corroded, debris-filled metal window wells, and you have a real eyesore!

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What To Expect

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Customer Information

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Don't just take our word for it

See what our customers have to say about our work.

NV Waterproofing was extremely responsive and 100% committed to identifying our water problem and designing a solution. Their work was excellent. The crew was on time and organized. They were very careful to protect the exterior landscaping and the interior of our home from dirt and debris. Even two years later, they responded to a sump problem at no additional charge. NV Waterproofing does the job right and stands behind its work.

Mike and Lynn F. | Columbia, MD

We bought a house in a state of disrepair, and so we've had to work with a number of contractors. I'd rank this company at the top of the list for their professionalism, knowledge, experience, and honesty. We had bowing of our basement walls that needed to be addressed. Michael came out to assess the situation, and gave us some options. After speaking with him, I felt very confident in their ability to buttress our walls. It was also a huge bonus that we were able to set up a payment plan for this job too. When the team showed up, Casey, Kevin, and Grant, they were super polite and professional. They took great care of our property, and if they had a question about anything, they asked. Also, if I had a question, Casey (the foreman), was very knowledgeable and quick to answer. They presented the work as they progressed through the job, and really, I was actually a little blown away by the scale of the project, and the speed at which they worked. What an impressive job they did! We're very confident in the work they did and will hire them again.

Ellen M.  | Takoma Park, MD

We were referred to NV Waterproofing from my brother-in-law who used them and was pleased. They came out and gave us an estimate - they were very prompt. We had the work done - it looked great and I am sure will do the job (only time will tell). We did have a miscommunication with the work (mostly on our part), but the owner had it fixed promptly and without additional cost. I would highly recommend them to anyone with water issues in their basement.

Susan C. | Washington DC, DC

NV stuck with me and made sure I was happy. Roberto Jr kept me calm as my problem persisted and kept working on a solution beyond the obvious. I highly recommend. Looking forward to a dry basement this summer.

Dean R. | Washington, DC

I am writing this letter to commend members of your organization for the waterproofing work performed on and around the foundation of my house. Despite situations beyond the control of both me and your associate, he always maintained professionalism and demonstrated why he is an outstanding representative of your organization. The crew obviously knew what had to be done and went about doing it. They were prompt in arriving at work each day, diligent in the performance of their duties (in spite of high heat and humidity), and took measures to ensure the safety around the excavated area (important because of children in the neighborhood). Unlike other construction sites I have seen, the crew maintained the area free of litter— no small measure these days! In addition, the crew always provided clear explanations of the work to be done each day, answering the questions with forthright and clear responses, never hurrying the discussion. As I was not on site while work was being done, they called me several times, taking those extra steps to keep me informed of the status of the work and aware of the tasks yet to be performed— something that is greatly appreciated. I would appreciate it if you would offer my heartfelt thanks to your able crew for the quality waterproofing work performed and the excellent communication and coordination exhibited by them.

Myra L. | Washington, DC

In my 12 years of having NV Waterproofing as a business partner, they have always proved reliable and trustworthy. They are a great value for me and my customers.

Darryl O. of Brookfield Homes, | Washington, DC

Great professional service and able to respond in timely manner to the project need.

Blake B. | Washington, DC

Brendan was very knowledgeable, professional and courteous. Highly recommend.

Cesar T. | Arlington, VA

A brief note to thank NV Waterproofing for extreme professionalism and courtesy in the manner in which my recent basement water seepage problem was addressed. From the initial contact with Jim, through the work with Roberto, Carlos and Jose, it was an overall pleasant experience – not to mention my contact with the owner and his responsiveness.

Ramesh T. | Arlington, VA

These guys were amazing. The initial visit was smooth, not pushy at all and he was even able to accommodate the relocation of a small drainage pipe. The demo to install the system was done beautifully, yes it was really good, you can tell they were precise and careful when doing so. Everything was clean, no stains on my carpet and they protected everything. No leak so far and I love it. Did I mention the price was excellent? I had 3 other companies to estimate thousands and even tried to sell extra unnecessary equipment. Thank you NV Waterproofing I have and will continue to recommend you.

Chelly Z. | Falls Church, VA

We appreciated NV Waterproofing's honesty and the men who worked tirelessly in uncomfortably cold weather. We've had one big storm since they finished and the basement walls are nice and dry. Nice work!

Peter V. | Falls Church, VA

Mauricio and Cristian were the initial sales reps who came to examine the issue and they took the time to test drainage that might have potentially been creating the water issue. They offered a reasonable solution (sealing the visible cracks and holes in the concrete) and I was contacted within a couple of days with an estimate and scheduling options. Sean was our tech and he did a fantastic job diagnosing the issue beyond just the cracks. He not only address all the holes and cracks in the concrete and mortar, he sealed up additional entry points above the foundation. He sourced additional materials to cover openings for cable lines. He went above and beyond and gave us measured information on how we should continue to monitor and treat this area as the house settles. He was thorough, informative, and provided excellent service in his work. I'm very glad that Sean was the technician sent to us and I would specifically request him for your projects.

Sara T. | Falls Church, VA

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Before & after photos

Check out before and after photos from some of our completed projects.

  • Sunken Concrete Step Repair in Stephens City, VA

    This Stephens City, VA homeowner was dealing with a sunken concrete front step that had settled over time, creating an uneven entryway and a noticeable tripping hazard near the front door. Sunken concrete steps can make everyday foot traffic unsafe for homeowners, guests, and delivery drivers, while also taking away from the home’s curb appeal. Our concrete repair team lifted and leveled the front step back to its proper position, creating a safer, more stable walkway and entrance. This concrete step repair helped reduce the risk of falls, improved the look of the front entry, and gave the home a cleaner, more welcoming appearance. The homeowner was thrilled with the outcome — a big transformation that improved both safety and curb appeal!

  • Basement Waterproofing in Winchestor, VA

    A homeowner in Winchester, VA, was struggling with a failing sump pump that couldn’t keep up during heavy rainstorms, leaving their basement vulnerable to water intrusion. The lack of a reliable backup system also left them worried about potential flooding during power outages. Frustrated and seeking a dependable solution, they contacted NV Waterproofing and Foundation Repair, a trusted basement waterproofing company in Winchester, VA.

    After assessing the situation, we replaced their old sump pump with a state-of-the-art TripleSafe Sump Pump system. This advanced system includes three levels of protection: a primary pump, a secondary pump for heavy water flow, and a battery backup to ensure the basement stays dry even during power outages. The homeowner now has peace of mind knowing their basement is fully protected, no matter the weather.

  • Pool Deck Leveling in Manassas, VA

    A homeowner in Manassas, VA, quickly realized their dream backyard pool was at risk when the surrounding concrete pool deck began to show serious problems. Uneven and sunken slabs created tripping hazards and unsightly cracks, making both safety and aesthetics a challenge for anyone using the space. Additionally, water from rain and pool use was pooling in low spots, causing slippery surfaces and further soil erosion beneath the deck. These issues not only threatened the safety of family and guests but also compromised the value and enjoyment of the home.

    Seeking an effective solution, the homeowner reached out to our team for a professional assessment. We identified the main cause of settlement: soil erosion under the slabs—a common issue in Manassas due to its clay-rich ground and fluctuating moisture. To address both the immediate hazards and prevent future damage, we recommended our two-part approach: the cutting-edge PolyLevel® concrete leveling system and NexusPro® Joint Sealant.

    The repair process began with drilling small holes into the affected concrete slabs, allowing us to inject high-strength PolyLevel® polyurethane foam beneath the surface. As the foam expanded, it filled voids, stabilized the soil, and gently lifted the slabs back to their original positions. The process was quick, clean, and minimized disruption, giving the pool deck a level, safe surface once again. PolyLevel® foam is waterproof and lightweight, reducing the risk of future settling and ensuring long-term durability, even in a wet poolside environment.

    To provide further protection, we sealed all cracks and joints with NexusPro® Joint Sealant. This flexible, weather-resistant sealant prevents water from seeping beneath the slabs, protecting the soil and concrete from additional erosion. The result was a clean, finished appearance that not only improved the look of the deck but also safeguarded it for years to come.

    Thanks to modern concrete leveling technology, the homeowner’s pool deck was transformed from a liability into a safe and attractive outdoor gathering space. The project was completed in a single day, with minimal mess and immediate results, giving the homeowner peace of mind and renewed pride in their backyard. If you’re facing similar issues with your pool deck in Manassas, VA, the PolyLevel® system and NexusPro® Joint Sealant offer a fast, effective, and lasting

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