St. Louis Basement Window Replacement

Drafts, water stains, rust, and stuck basement sashes usually point to a failing opening. For many Greater St. Louis homeowners, the most reliable fix comes through basement window replacement.

At STL Windows and Doors, we replace outdated basement windows with energy-efficient windows from ProVia, installed by our in-house team for a clean finish and long-term value.

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Hopper Window - Aspect by ProVia - In Sandstone

Drafty, Leaky Basement Windows Replacement in St. Louis – Without the Guesswork

Old basement windows fail in predictable ways: the frame loosens, caulk breaks down, and outside air starts moving through joints you cannot always see. Not only does the outside elements start to come in, but so do the outside critters if it’s bad enough.

That is why we focus on complete replacement instead of patchwork repairs when the opening, sash, or seal has already lost integrity. We install ProVia ENERGY STAR®-certified basement windows built to seal tightly and perform well in St. Louis conditions.

Properly fitted energy-efficient windows can improve comfort, reduce nuisance moisture, and support home value.

With a 10-year workmanship guarantee, turn to STL Windows & Doors for basement window replacement.

Common Basement Window Problems

The most common failures we see in basement windows often show up together and tend to worsen over time if left unaddressed. In many cases, these problems are interconnected. Once the window perimeter begins to fail, it starts a cascading effects that ultimately needs to be addressed.

Here are the key issues we regularly see:

Water intrusion around the frame: Moisture entering at the perimeter can lead to rot, mold, and structural damage.
Failed or deteriorating caulk lines: When caulking no longer bonds to masonry, it creates gaps that accelerate both air leakage and water entry.
Shifting or weakened window openings: The integrity of the opening is just as important as the window itself. New windows can’t perform properly if the surrounding structure is compromised.
Condensation and fogging between panes: Often a sign of seal failure, leading to reduced energy efficiency and visibility issues.
Musty odors and poor air quality: Typically caused by excess moisture, poor sealing, or inadequate ventilation.
Security concerns from failing locks or warped sashes: Windows that don’t close or lock properly can become easy access points.
Pest intrusion through gaps and openings: Small openings around frames or sashes can allow insects and rodents to enter the home.

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Basement Window Options We Install (And When Each One Makes Sense)

We focus on ProVia basement window solutions that balance ventilation, security, and long-term sealing. Our recommendation depends on the opening size, foundation type, and whether the basement is unfinished utility space, storage, or part of a finished basement living area.

If you are comparing styles, start with function before appearance. A basement used every day may need airflow and easy operation, while a storage area may benefit more from a fixed unit with fewer moving parts.

Option	Best for	Why it’s a good fit	Tradeoffs
Hopper window	Everyday ventilation	Tight seal, energy efficient, and a common fit for St. Louis basements	Smaller clear opening than larger styles
Sliding basement window	Wider openings	Simple operation with good horizontal airflow	Tracks require routine cleaning to stay smooth
Fixed basement window	Maximum seal	No moving parts, excellent for energy efficiency and security	No ventilation
Casement window (egress)	Basement bedrooms / code compliance	Opens fully outward for maximum clear opening, making it ideal for egress requirements	Requires adequate exterior clearance and may increase project scope

Our Top Basement Window Recommendations

While there are technically many different window styles you can use in a basement, the top styles we recommend are hopper, slider, and casement.

Hopper Windows

Hopper windows are one of the most common choices for basements because they open inward from the top, creating a tight seal when closed. They’re ideal for ventilation in smaller openings while helping keep out water, debris, and drafts.

Sliding Windows

Sliding windows work well for wider openings and provide simple, reliable operation. They allow for good horizontal airflow and are a practical option when you want more ventilation without increasing the window height.

Casement Windows

Casement windows are often recommended for basement bedrooms because they open fully outward, creating a larger clear opening. This makes them a strong choice for egress situations where safety and code compliance are required.

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What You Get With Our Basement Window Replacement

Our replacement window service includes professional removal, exact measuring, installation, sealing, and cleanup with respectful in-home service from start to finish.

A basement opening only performs as well as its fit, so we pay close attention to operation, perimeter sealing, interior trim, and exterior appearance.

Our Basement Window Replacement Process Is Simple

In-Home Evaluation & Inspection: We assess each basement window opening, take exact measurements, and inspect the buck, sill, and surrounding area for signs of moisture intrusion or structural concerns.
Product Selection & Quote: We help you choose the best window option for your space and provide a clear quote outlining scope, timeline, and warranty details.
Professional Installation: Our in-house crew handles the full installation, including proper sealing and finishing to ensure a tight, long-lasting fit.
Cleanup & Final Walkthrough: We clean the work area and walk you through the completed installation to confirm proper operation, fit, and overall quality.

Why Choose STL Windows & Doors – Trusted Local Installation Backed by Strong Warranties

We are a family-owned business founded in 2014, and that matters because ownership and installation standards stay closely connected. Many window installation companies sell the project and pass it along. We use our own in-house certified installers, not subcontractors, for consistent quality and accountability.

ProVia Platinum Dealer and Certified Installer
10-year workmanship warranty
In business since 2014
Clear Communication
Local, family-owned business

What Customers Say About US

“I was extremely pleased with STL windows and doors. I got many quotes and when STL windows and doors came to give me a quote and explain the description of the job to be done, the clean up process, and the detail to be completed it was a no brainer. The lead time was longer than I expected, but they care about the final result and are passionate and knowledgeable about what they do. I had 7 basement windows replaced and Tony and Max did a great job on installation. Clean, efficient, and told me exactly what to expect. I would use STL windows and doors again.“

– Annie Allen

“STL Windows and Doors installed 4 new doors (front, back, basement and sliding double door) with new storm doors and 15 windows (of all different shapes n sizes) on our old home in the city.
The fantastic team of Andy, Tony, Jake and Curtis did a wonderful job! Our new doors n windows look terrific and will provide additional security and energy efficiency saving us $$ and piece of mind.
The team was professional, knowledgable and dependable! Work areas were cleaner than before the installation. They were great! We would definitely recommend them for any of your door or window needs!!”

– MaryEllen

“Thank Dan and Andy for installing these beautiful casement windows. You guys exceeded my expectations and made this experience so easy. I can’t thank you enough.“

– Sandy Cheung

      EXCELLENT  
   Based on 199 reviews 
    
 
 
 
   
 
 
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   Jeff Gordon 
 
 
 
 Trustindex verifies that the original source of the review is Google. Peyton and Max installed 21 new windows and a new front door. They were a pleasure to work with, especially since we had other home improvement projects going at the same time. They did meticulous work and answered all of our questions.
  
 
     Posted on Google  
   
   Mike Kelly 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a great experience with STL Windows and Doors. They we're booked up initially, but they still were able to setup an appointment and put me on the schedule.

This company has great prompt customer service, fair pricing, and great professionalism. I would highly recommend their service.
  
 
     Posted on Google  
   
   Anne Croy 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent service with initial sale and installation!!  High quality product.
  
 
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   Vivian Saied 
 
 
 
 Trustindex verifies that the original source of the review is Google. I used Stl windows and doors to replace half of the windows in my house and a sliding door. The whole process was excellent. From talking with Dan, the sale manager to the installers (Tony and his crew ) to Scheduling with Chris at the office. First of all, Chris was able to up my schedule date a week early upon my request. I'm sure he squeezed me in his tight schedule. I was very thankful. Tony and his crew were very professional, yet  friendly and considerate. They were prompt on time the 3 days they came and very efficient. They took down my window treatments and put them back up again exactly the way they were. They moved furniture and put back.  They took the time to explain how the windows opened from top to bottom as the windows had many options that my old windows didn't have. I would use them again and would definitely recommend them to my family and friends
  
 
     Posted on Google  
   
   Elizabeth Purcell 
 
 
 
 Trustindex verifies that the original source of the review is Google. Worth the wait! Price was insanely different from other bids for a single window replacement. Paid cash for a slightly better rate. Originally was going to need to wait 8 months for replacement but I got lucky & they fit me in at the 4 month marker since they had a cancellation.  Customer service from Kaleb & Tony was outstanding.  Both were very personable & made me feel confident that the job was being done well.  Great warranty! Glad to check this off my list:)
  
 
     Posted on Google  
   
   Aaron Fox 
 
 
 
 Trustindex verifies that the original source of the review is Google. STL Windows and Doors did an excellent job with our window replacement project. We live in an older home (over 100 years old) and we know there are going to be issues related to its age. The STL Windows and Doors team worked extremely hard with us to replace one of our bathroom windows that had begun to show signs of water damage. After the initial window replacement project was finished, we did communicate with their team about concerns we had with the original window frame that remained. Chelsea worked with us and a team (Tony and Caleb) came to our house within a week and replaced the frame as well. Their prices were reasonable and they had an array of choices. Overall, we highly recommend them for any window-related project you may have!
  
 
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   Jake Bloomer 
 
 
 
 Trustindex verifies that the original source of the review is Google. Experience was great, STL W+D replaced our old rear door and transom with a new eight-foot unit. It’s great to have this huge pane of glass looking out over the back yard. Installers were great and clean and shimmied the door in without removing our old casing and messing with the plaster. They know what they are doing!
  
 
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   Randall H 
 
 
 
 Trustindex verifies that the original source of the review is Google. The removal of the old window and the installation of the new window went more smoothly than I would have expected. Peyton and Max were knowledgeable, professional, and completed the installation beautifully and efficiently. Both of them did a great job with making in the new window secure, sealed, and attractive.
  
 
     Posted on Google  
   
   T Baker 
 
 
 
 Trustindex verifies that the original source of the review is Google. Premium products and service at a more affordable price. Fantastic experience at every step of the process. Had some hail and tornado damage. Jared (sales) was friendly and knowledgeable about the industry. Did not hard sell, but instead provided a balanced and very detailed explanation of STL's products and services vs competitors, which felt trustworthy. Dan (owner) came out to measure the windows. My spouse said he was friendly and answered her questions. We got an unexpected scheduling break and installed much sooner than the expected wait. The installers, Peyton and Max, were friendly, efficient, and conscientious of our home. Their finish work (sealing and caulking) is better than the original for the house. They took the time to demonstrate all the features of the new windows and how to care for them. We all noticed a defect in the glazing inside one of the window sashes, which they immediately reported to the owner who, in turn, called me immediately about the manufacturer's quick replacement. Provia warrantees the vinyl, glass, hardware and screen of the window for life and this guarantee is transferable once to a new home owner. The installation has a 10-year guarantee. Also, STL has another business for window cleaning and screen replacement, which we're going to check out.
  
 
     Posted on Google  
   
   Jessica Klemp 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great company to work with! We needed four hopper windows replaced on our garage/basement and STL Windows and Doors provided the best service and most competitive pricing. The work was done quickly and professionally, and everyone we met from the company was friendly. We would recommend calling them for your window needs!

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Service Area Around St. Louis

We serve homeowners across the St. Louis metro area, including St. Charles, Jefferson, Franklin, and Lincoln counties.

FAQs About basement Windows

Here are some of the top questions we receive about basement windows. Have other questions? Give us a call.

Technically, yes, you can replace a basement window yourself if you have the right tools, experience, and knowledge of proper window installation. However, basement windows can be tricky because they often sit in concrete, masonry, or older foundation openings that are not perfectly square.

A poor fit can lead to water leaks, drafts, pest entry, security concerns, and long-term moisture problems. Unless you are experienced with measuring, sealing, flashing, and installing windows in basement openings, it is usually better to call a professional basement window replacement company like STL Windows and Doors.

Common basement window problems include water leaks, rotting frames, broken glass, rusted metal frames, poor insulation, difficult operation, drafts, condensation, and pest intrusion. In many older St. Louis homes, basement windows may also be undersized, outdated, or installed in uneven foundation openings.

Because basement windows sit close to the ground, they are more exposed to moisture, soil, temperature changes, and debris. Replacing old basement windows can help improve comfort, energy efficiency, security, ventilation, and moisture protection.

The best replacement basement window depends on the size of the opening, how the room is used, ventilation needs, security concerns, and whether the window must meet egress requirements. For many basement applications, hopper windows, sliding windows, and casement windows are popular choices because they provide practical ventilation and work well in smaller openings.

You should also consider frame material, glass efficiency, locking hardware, ease of operation, and moisture resistance. A professional installer can measure the opening, explain your options, and help you choose a basement window that fits properly and performs well in your home.

The average cost to replace a basement window ranges from a couple hundred dollars to over a thousand dollars. The price varies significantly depending on the window size, style, frame material, glass package, condition of the existing opening, and installation requirements. Simple basement window replacements are usually more affordable than larger specialty windows, but costs can increase if the opening needs repair, resizing, or additional sealing work.

The best way to get an accurate price is to schedule an in-home estimate.

Yes, basement windows are often different from regular windows because they are usually smaller, installed closer to ground level, and placed in foundation or masonry openings. They also need to handle moisture exposure, limited space, security concerns, and sometimes egress requirements.

While they use many of the same materials and glass options as other replacement windows, basement windows require careful installation to prevent leaks, drafts, and fit issues. Choosing the right basement window and having it professionally installed can make a major difference in performance, comfort, and long-term durability.

Get a Fast Quote and Lock In Your Install Date

If you are seeing drafts, leaks, rust, or a sash that no longer opens and closes correctly, fill out the form below to get started. We’re the St. Louis basement window replacement experts you can trust.

St. Louis Basement Window Replacement

Drafty, Leaky Basement Windows Replacement in St. Louis – Without the Guesswork

Common Basement Window Problems

Basement Window Options We Install (And When Each One Makes Sense)

Our Top Basement Window Recommendations

Hopper Windows

Sliding Windows

Casement Windows

What You Get With Our Basement Window Replacement

Why Choose STL Windows & Doors – Trusted Local Installation Backed by Strong Warranties

What Customers Say About US

Service Area Around St. Louis

FAQs About basement Windows

Can I replace my basement window myself?

What are common problems with basement windows?

How do I choose a replacement basement window?

What is the average cost to replace a basement window?

Are basement windows different from regular windows?

Get a Fast Quote and Lock In Your Install Date