20 Best Window Companies in Union, MO (2025 Reviews)
Are you looking to upgrade your windows? Our guide to the top window installation companies can help you pick the right one for you.
We analyzed all the top-rated window companies in Union 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
Whether you're doing home renovations or have windows that need repairs, windows play an important role in conserving electricity in your home. When it’s the middle of summer, your outdated and leaky windows could be making your home harder to cool and costing you more in power bills.
Thankfully, helping you save energy with efficient windows also helps our goals of conserving energy and the resources it takes to make it.
As windows have such a large impact on your home, choosing the best company for you is a big choice to make. That’s why the EcoWatch team has curated this list of the best window replacement companies, so you can make an informed decision more easily.
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 Union
The EcoWatch Reviews team researched several window providers in Union to find the top ones for our readers. The companies mentioned in this article scored best in our review categories, which include energy-efficient offerings, customer service, local expertise, availability, price 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 offers windows expertise in Union. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has been in the window installation business for about 27 years.
You may want to consider going with Window World if you're interested in a installer that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital.
Energy Efficiency of Window World WindowsThere are a wide variety of window types available from Window World, some of which are Energy Star products. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.
How much does Window World cost in Union?Prices aren’t available on Window World’s website, but it's known for offering some of the most affordable window installations around. You can ask for a free quote on its website for more information about the cost.

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 offers the best availability in Union. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window installation business for about 27 years.
You may want to consider going with Andersen if you're interested in a installer that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started.
Energy Efficiency of Renewal by Andersen WindowsThere are a wide variety of window types available from Renewal by Andersen, some of which are Energy Star products. A 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.
How much does Renewal by Andersen cost in Union?Prices aren’t available 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. You can ask for a free quote on its website for more information about the cost.

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 offers the best residential windows in Union. It's a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. Window Nation has been in the window installation business for about 16 years.
You may want to consider going with Window Nation if you're interested in a installer that gives customers the opportunity to view products and to speak to a representative in person in its showrooms.
Energy Efficiency of Window Nation WindowsThere are a wide variety of window types available from Window Nation, some of which are Energy Star products. Each 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.
How much does Window Nation cost in Union?Prices aren’t available 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. You can ask for a free quote on its website for more information about the cost.
We try to be unbiased and transparent by including pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.
More Window Companies in Union
Renewal by Andersen
Maryland Heights, MOGood Customer Service
Free assessment
Timely Service
Educational Website
Price Transparency
Services Offered
Double-Hung
Bay Windows
Window Replacement/Installation
Skylights
Glass Doors
Champion Replacement Windows of St. Louis
Fenton, MOFree assessment
Price Transparency
Good Customer Service
Services Offered
Glass Doors
Double-Hung
Window Replacement/Installation
Bay Windows
Window Nation
Overland, MOEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Double-Hung
Glass Doors
Vinyl Frames
Bay Windows
Custom Window Designs
Energy-Efficient Options
Home Comfort Exteriors
St Peters, MOPrice Transparency
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Building Envelope Experts
Fenton, MOPrice Transparency
Timely Service
Good Customer Service
Free assessment
Educational Website
Services Offered
Custom Window Designs
Window Replacement/Installation
Glass Doors
Double-Hung
Vinyl Frames
Energy-Efficient Options
Bay Windows
Chaney Windows And Doors
Maryland Heights, MOEducational Website
Good Customer Service
Price Transparency
Free assessment
Services Offered
Vinyl Frames
Bay Windows
Window Replacement/Installation
Energy-Efficient Options
Wood Frames
Glass Doors
Colonial Construction
St. Louis, MOGood Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Gateway Door and Contracting
St Charles, MOEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Windows Doors & More LLC
St Charles, MOGood Customer Service
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Gateway General Contractors
O'Fallon, MOPrice Transparency
Educational Website
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Cardinal Contractors
St. Louis, MOPrice Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
STL Windows and Doors
Earth City, MOTimely Service
Free assessment
Price Transparency
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Glass Doors
Double-Hung
Bay Windows
Quality Installation
Swansea, ILGood Customer Service
Free assessment
Services Offered
Glass Doors
Window Replacement/Installation
Butler Home Improvement
Collinsville, ILPrice Transparency
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Roark Glass LLC
Vienna, MOPrice Transparency
Services Offered
Window Replacement/Installation
Jones Home Improvements
Cottleville, MOFree assessment
Price Transparency
Good Customer Service
Services Offered
Window Replacement/Installation
Jacob Sunrooms, Exteriors & Baths
Fenton, MOFree assessment
Good Customer Service
Educational Website
Price Transparency
Services Offered
Vinyl Frames
Fiberglass Frames
Glass Showers
Energy-Efficient Options
Window Replacement/Installation
Glass Doctor of St. Charles, MO
St Charles, MOGood Customer Service
Price Transparency
Educational Website
Services Offered
Glass Repair
Custom Glass
Window Replacement/Installation
Tempered Glass
Window Repair
Glass Doors
Mirrors
Energy-Efficient Options
Glass Showers
Mills Window & Door Showroom
Fenton, MOPrice Transparency
Free assessment
Good Customer Service
Services Offered
Glass Doors
Window Replacement/Installation
Lyons Glass Company
Alton, ILGood Customer Service
Price Transparency
Free assessment
Services Offered
Glass Repair
Window Replacement/Installation
Mirrors
Glass Doors
Glass Showers
Tempered Glass
Calculate how much you can expect to pay for window installation and replacement in Union, 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 Union Saves You Money
By upgrading to energy-efficient windows, you and your family can enjoy several benefits, including:
- Reduce your carbon footprint: Since energy-efficient windows improve the insulation in your house, you can reduce your carbon footprint by about 12%, according to Energy Star.
- Save money on electricity bills: According to the Department of Energy, heat gained or lost through windows accounts for about 25-30% of residential energy use. Replacing your windows with energy-efficient models can help reduce how much energy is used in your home, therefore saving you about 12% more on your bills.
- Protect your investment: If your home is on the older side, your windows are most likely outdated. Upgrading your windows can improve the insulation in your home and also help raise the value of your house if you decide to sell.
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which filter out damaging UV rays, reducing fading of your furniture, carpet and other valuables.
Estimated Cost of Window Replacement in Union
Each window installation company provides varying services and has varying prices based on a few factors.
How Much Do New Windows Cost?
Typically, homeowners in Union can anticipate that most window installations will range from $250 to $1,200, with the average cost sitting at about $600. This is because window installations are based on several factors specific to your home, including the size, material and number of windows you need to install, as well as where your property is located.
It’s important to keep in mind that windows with the best efficiency may cost more upfront but can save you hundreds of dollars via returns on your energy bills. Investing in Energy Star certified windows can save Union homeowners $374+ a year when replacing single-pane windows.
Something else that affects the total cost is the material you choose for your frame. Aluminum frames are usually the least pricey and are sturdy and light, but they offer poor insulation. On the other hand, wood frames cost the most, as they are aesthetically pleasing and offer decent insulation. Fiberglass and vinyl frames provide good insulation as well and cost somewhere between the other two.
What Services do Window Installers Offer?
When considering window replacements, in general there are two kinds that your provider will offer: full-frame and pocket installations.
A full-frame installation is a total window replacement. This service involves removing the old window, the sill, and the exterior and interior trim. It can also involve additional materials, like insulation and drip edges, which increase the total cost of the project. Also worth noting: you may have to touch up the paint around the window after a full-frame installation. Pocket installations are on the simpler end and won’t cost as much because they entail simply replacing the window within its existing frame. But if the frame has any damage, you may have to get a full-frame installation instead.
Your window installation company can help you choose which type of installation you need.
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 Union
In our search to make your home improvements easier and more eco-friendly in Union, the EcoWatch team examined dozens of companies before settling on these. We’ve decided to evaluate the best window installation companies in Union mostly based on energy efficiency, as it’s what’s best for the environment and for you as a homeowner. Energy Star certified windows have been shown to cut your power bills by hundreds of dollars. Along with energy efficiency, our rating methodology is based on the following factors:
Service Area
This one is self-explanatory, but we’ve chosen to highlight window installers that serve Union so you can find a quality window installation company near you.
Work Quality
We’re willing to bet that you’re looking for a company to do a great job installing windows. We’ve vetted each installer featured in our guide to ensure its technicians are well-qualified and that the company has gotten a lot of positive customer feedback to vouch for its service.
Customer Reviews
We analyzed patterns in recent online reviews to determine the companies with the highest rates of customer satisfaction. Customer satisfaction might be the factor we place the most value on, as it indicates the quality of services across nearly every category, including cost, warranty, quality of parts, professionalism, quality of installation and more.
Cost
Cheaper windows certainly don’t mean better windows, but we know many of our readers want to keep costs low when possible. When analyzing the prices of providers, we awarded higher points to companies with reasonable prices and accessible financing rather than “cheaper” services.
Warranty
Protecting your investment in new windows is important. For that reason, window installation companies with 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 installation companies that have more years of experience earn higher rankings by our standards. We like to see at least ten years of experience.
Union, MO Window Replacement FAQs
What is the typical cost to replace windows in a home?
The national average cost of installing a single window is around $600 but can range from $200 to $1,200, based on a variety of factors. The price is often influenced by the type and material of the window, the location of your property and the size 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 are the most common types of replacement windows?
There are various kinds of windows you can get for your home, such as awning windows, transom windows, casement windows, double-hung and single-hung windows, bay windows, picture windows and slider windows.
Do you really have to use a window installation company?
Unless you have experience with home improvement projects and have the tools needed to replace your own windows, we recommend hiring the pros. The process of installing windows is quite involved and can take anywhere from four to six hours for a single window. Although it’s tempting to try to save some money by doing it yourself, hiring a professional is a faster, more efficient and safer alternative.
Should I replace my windows all at the same time?
If your windows are more than 20 years old, it’s most likely time to replace all of them. By that point, they are often less efficient, draftier and/or more damaged than new windows. Replacing your windows all at the same time will involve less paperwork and less time.