20 Best Window Companies in St. Charles, MO (2025 Reviews)
Thinking about improving your house’s insulation? The best window replacement companies can help.
We analyzed all the top-rated window companies in St. Charles and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
The EcoWatch Reviews team is all about finding solutions for eco-conscious homeowners in St. Charles. Poor windows can make your home uncomfortable in the summer or winter.
Thankfully, helping you save energy with more efficient windows also helps our goals of conserving energy and the resources it takes to generate it.
We’ve put together this list of the best installation companies to help you in your research, so you can not only enjoy brand-new windows, but also save money on your power bills.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Best Energy-Efficient Features
Champion
- Many years of experience
- Low prices relative to competitors
- Limetime warranty
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best Window Installation & Replacement Companies in St. Charles
The EcoWatch team examined dozens of companies that serve the St. Charles area to find the top window installation companies by our standards. We assessed the companies based on their energy-efficient offerings, coverage area, price, local experience, customer service and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World has windows expertise in St. Charles. Window World has over 27 years of industry experience, and it currently provides services to 200 locations nationwide.
If you’re looking for a company that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital, this may be the perfect provider for you.
Energy Efficiency of Window World WindowsIts high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home. Not all of Window World’s offerings are Energy Star certified, so be sure to mention that you’re interested in Energy Star windows when inquiring.
How much does Window World cost in St. Charles?Prices aren’t displayed on Window World’s website, but it's known for offering some of the most affordable window installations around. The best way to know for sure is to ask for a free quote from the company.

Renewal by Andersen
Great industry reputation
Award-winning company
Member of US Green Building Council
Manufactures products in-house
No lifetime warranty
More expensive than competition
Renewal by Andersen has the best availability in St. Charles. Andersen has over 27 years of industry experience, and it currently provides services to nearly every state except Mississippi and West Virginia.
If you’re looking for a company that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started, this may be the perfect provider for you.
Energy Efficiency of Renewal by Andersen WindowsA handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019. Not all of Andersen’s offerings are Energy Star certified, so be sure to mention that you’re interested in Energy Star windows when inquiring.
How much does Renewal by Andersen cost in St. Charles?Prices aren’t displayed on Andersen’s website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. The best way to know for sure is to ask for a free quote from the company.

Window Nation
Award-winning company
Manufactures products in-house
Custom designs
Wide variety of products and services
Installation not covered by warranty
Limited service area
Window Nation has the best residential windows in St. Charles. Window Nation has over 16 years of industry experience, and it currently provides services to residents within 75 miles of its showrooms, which are in 13 states.
If you’re looking for a company that gives customers the opportunity to view products and to speak to a representative in person in its showrooms, this may be the perfect provider for you.
Energy Efficiency of Window Nation WindowsEach product has windowpanes coated with a Low-E (low emissivity) glaze that prevents damaging UV rays from heating your home. Plus, the spaces between double- and triple-pane windows are filled with argon gas that’s been proven to improve home insulation. Not all of Window Nation’s offerings are Energy Star certified, so be sure to mention that you’re interested in Energy Star windows when inquiring.
How much does Window Nation cost in St. Charles?Prices aren’t displayed on Window Nation’s website, but based on customer feedback, you can expect to pay between $300 and $525 per window installed, making it a more affordable option compared to competitors. The best way to know for sure is to ask for a free quote from the company.
We strive to be unbiased and transparent by listing pros and cons for each installer. Additionally, any partnerships do not influence our reviews.
More Window Companies in St. Charles
Renewal by Andersen
Maryland Heights, MOEducational Website
Timely Service
Price Transparency
Good Customer Service
Free assessment
Services Offered
Bay Windows
Double-Hung
Skylights
Glass Doors
Window Replacement/Installation
Champion Replacement Windows of St. Louis
Fenton, MOPrice Transparency
Free assessment
Good Customer Service
Services Offered
Bay Windows
Window Replacement/Installation
Double-Hung
Glass Doors
Window Nation
Overland, MOPrice Transparency
Free assessment
Educational Website
Good Customer Service
Services Offered
Bay Windows
Custom Window Designs
Window Replacement/Installation
Vinyl Frames
Energy-Efficient Options
Double-Hung
Glass Doors
Gateway Door and Contracting
St Charles, MOEducational Website
Good Customer Service
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Windows Doors & More LLC
St Charles, MOFree assessment
Educational Website
Good Customer Service
Services Offered
Energy-Efficient Options
Window Replacement/Installation
Chaney Windows And Doors
Maryland Heights, MOEducational Website
Free assessment
Price Transparency
Good Customer Service
Services Offered
Wood Frames
Vinyl Frames
Energy-Efficient Options
Glass Doors
Bay Windows
Window Replacement/Installation
Home Comfort Exteriors
St Peters, MOPrice Transparency
Good Customer Service
Free assessment
Services Offered
Energy-Efficient Options
Window Replacement/Installation
Building Envelope Experts
Fenton, MOFree assessment
Timely Service
Price Transparency
Educational Website
Good Customer Service
Services Offered
Energy-Efficient Options
Vinyl Frames
Custom Window Designs
Glass Doors
Bay Windows
Window Replacement/Installation
Double-Hung
Colonial Construction
St. Louis, MOGood Customer Service
Educational Website
Services Offered
Window Replacement/Installation
STL Windows and Doors
Earth City, MOPrice Transparency
Free assessment
Good Customer Service
Timely Service
Educational Website
Services Offered
Window Replacement/Installation
Double-Hung
Glass Doors
Bay Windows
Cardinal Contractors
St. Louis, MOGood Customer Service
Price Transparency
Free assessment
Services Offered
Window Replacement/Installation
Gateway General Contractors
O'Fallon, MOPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Butler Home Improvement
Collinsville, ILPrice Transparency
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Quality Installation
Swansea, ILFree assessment
Good Customer Service
Services Offered
Glass Doors
Window Replacement/Installation
Glass Doctor of St. Charles, MO
St Charles, MOPrice Transparency
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Glass Showers
Mirrors
Glass Repair
Window Repair
Glass Doors
Custom Glass
Tempered Glass
Jones Home Improvements
Cottleville, MOFree assessment
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Jacob Sunrooms, Exteriors & Baths
Fenton, MOFree assessment
Educational Website
Good Customer Service
Price Transparency
Services Offered
Energy-Efficient Options
Glass Showers
Fiberglass Frames
Window Replacement/Installation
Vinyl Frames
Mills Window & Door Showroom
Fenton, MOGood Customer Service
Price Transparency
Free assessment
Services Offered
Window Replacement/Installation
Glass Doors
Lyons Glass Company
Alton, ILPrice Transparency
Good Customer Service
Free assessment
Services Offered
Glass Doors
Glass Repair
Window Replacement/Installation
Glass Showers
Tempered Glass
Mirrors
L&D Wilson's Siding & Roofing Inc
Lebanon, ILGood Customer Service
Price Transparency
Timely Service
Free assessment
Services Offered
Window Repair
Double-Hung
Window Replacement/Installation
Energy-Efficient Options
Calculate how much you can expect to pay for window installation and replacement in St. Charles, MO using our customized window cost calculator.
Estimates will vary based on window dimensions and other unique factors to your home. Getting in touch with a local window installer is the best way to get an accurate cost estimate for your home.
How Installing Energy-Efficient Windows in St. Charles Saves You Money
Switching to energy-efficient windows can improve the comfort of your home and help you save on power bills. Here are more details about how switching out your windows could help you:
- Protect your investment: Upgrading your windows is an important part of maintaining your property and its real estate value, especially if your home is on the older side.
- Reduce your carbon footprint: Reducing how much energy you use also lowers your indirect greenhouse gas emissions. You could reduce it by 763 pounds per year on average.
- Save money on energy bills: Once you switch to energy-efficient windows, you can see a reduction in your bills by about 12% since you’ll require less energy to heat or cool your house.
- Protect your valuables from fading: The low-emissivity coatings on many energy-efficient windows filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.
Estimated Cost of Window Replacement in St. Charles
Windows come in different shapes and sizes, so costs and services will differ tremendously. Here are the average costs and the primary services that you can find from window installation companies.
How Much Do New Windows Cost?
The average cost to install a single window is about $600 but can range from $200 to $1,200. These numbers vary depending on specific characteristics of your installation, such as size, type, material, number of windows, the location of your home and more.
Bear in mind that energy-efficient windows may have a higher price, but Energy Star estimates the upgrade will save you between $101 and $583 per year when you install single-pane windows and between $27 and $197 per year when you replace double-pane, clear glass windows. Your exact savings will vary based on your local climate, energy rates and individual home characteristics.
The cost of your window installation will also vary based on the type of window material you choose for the frames. Wood windows are typically the most expensive, though it depends on whether they are solid wood or clad with aluminum or vinyl. Fiberglass windows also tend to be a bit more expensive than vinyl, but they are more efficient.
What Services do Window Installers Offer?
The first question to ask yourself when considering a window replacement is: Do you want a full-frame installation or a pocket installation?
Full-frame installations require replacing the full window — the sill, frame, trim and all. These are most common when you want a new style for your windows or when it has a great amount of rot or deterioration. Full-frame installations are more time-consuming and will increase overall costs. A pocket installation entails replacing a window within the existing frame. So, instead of removing the whole window and rebuilding it, the contractor will just slide the replacement window (also called a retrofit or insert window) into the frame.
Your window installation company will be able to help you choose what’s best for your needs. In St. Charles, the decision will mostly be based on how old your windows are and if there’s any damage. Wood can decay if not maintained properly over the years, so it’s a good idea to have a professional check your frames and window sills.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Best Energy-Efficient Features
Champion
- Many years of experience
- Low prices relative to competitors
- Limetime warranty
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
How We Choose the Best Window Installers in St. Charles
In our search to find the most reliable, eco-friendly window installers in St. Charles, the EcoWatch team landed on the above companies as the top window installation companies in the city. Along with energy efficiency, we analyzed each installer and assigned rankings based on the following methodology:
Service Area
Since this is a guide for St. Charles, we gave more points to companies that serve the city. There are certainly other reputable providers that didn’t make our list because of the low odds that they would serve the average homeowner in St. Charles.
Work Quality
When picking new windows, the quality and breadth of services often plays just as important of a role in insulation and performance as the brand of window you choose. We do rate window installers higher if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.
Customer Reviews
Customer feedback is another super important review factor. If the majority of customers don’t have nice things to say about their experience with a certain installer, it won’t be featured on EcoWatch.
Cost
This one is a give-and-take: similar to other services, cheap window companies may not provide the highest quality service. Still, we want to make sure we’re highlighting companies that provide a range of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important. For that reason, window installation companies that have lengthy warranties for products, parts and labor rank higher with EcoWatch.
Years of Experience
Last but not least, we like to see companies that have a good track record in the industry. Window installers that have more years of experience earn higher rankings by our standards. We like to see at least ten years of experience.
St. Charles, MO Window Replacement FAQs
How much should a window install cost?
The national average cost of installing one window is about $600 but can range from $200 to $1,200, based on a variety of factors. The price is usually influenced by the size of the window, the location of your property and the type and material of the window. Also, remember that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
What kind of window is the most energy-efficient?
A window’s energy efficiency depends on a number of factors, such as the quality of the installation and what kind of window it is. Look for Energy Star Certified windows — these are typically the most energy-efficient and are certified by the U.S. Department of Energy.
Can you install your own windows?
If you’re handy and have experience with installing a replacement window, it’s possible to install your own windows. But if you don’t have the time or skills, we recommend hiring a professional.
How often do you need to replace your windows?
Windows generally last 20 to 30 years, but anytime you notice damage on your windows, it’s a good time to have them looked at by an expert to see if they need any repairs or replacements.
Should I replace all my windows at once?
If you’re upgrading your windows to get more efficient windows, replacing all your windows together is the only way to see a noticeable difference. However, if you have just a few windows that are damaged or leaky, you can replace just those.