20 Best Window Companies in Flagg, IL (2024 Reviews)
Looking to improve your property’s value? The top window replacement companies can help.
We analyzed all the top-rated window companies in Flagg 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
Although renewable energy sources like wind and solar are important when it comes to lowering your carbon footprint, improving your home’s energy efficiency can also have a large impact on home energy conservation. Potential leaks or drafts from your windows can make your AC or heater work extra hard in the summer or winter.
Thankfully, saving you money with more efficient windows also aligns with our goals of conserving energy and the resources it takes to generate it.
We’ve put together this list of the top installation companies to help you in your research, so you can not only benefit from brand-new windows, but also save money on your electric bills.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Window Installation & Replacement Companies in Flagg
The EcoWatch team examined dozens of providers that service the Flagg area to find the best window installation companies that fit our standards. The companies mentioned in this article passed our review standards for energy-efficient offerings as well as price, local expertise, customer service and beyond.

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 provides windows expertise in Flagg. This company has been operating since 1995 and currently services 200 locations nationwide. Its reputation is backed by several positive reviews on customer review websites.
It 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 WindowsWindow World appeals to eco-conscious consumers by providing energy-efficient window offerings. 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 Flagg?Prices aren’t mentioned on Window World’s website, but it's known for offering some of the most affordable window installations around. Receiving a free quote on its website is the best way to know for sure.

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 provides the best availability in Flagg. This company has been operating since 1995 and currently services nearly every state except Mississippi and West Virginia. Its reputation is backed by several positive reviews on customer review websites.
It 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 WindowsRenewal by Andersen appeals to eco-conscious consumers by providing energy-efficient window offerings. 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 Flagg?Prices aren’t mentioned 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. Receiving a free quote on its website is the best way to know for sure.

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 provides the best residential windows in Flagg. This company has been operating since 2006 and currently services residents within 75 miles of its showrooms, which are in 13 states. Its reputation is backed by several positive reviews on customer review websites.
It gives customers the opportunity to view products and to speak to a representative in person in its showrooms.
Energy Efficiency of Window Nation WindowsWindow Nation appeals to eco-conscious consumers by providing energy-efficient window offerings. 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 Flagg?Prices aren’t mentioned 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. Receiving a free quote on its website is the best way to know for sure.
We have tried to remain unbiased and transparent by listing pros and cons for every installer. Additionally, any partnerships do not affect our reviews.
More Window Companies in Flagg
Renewal by Andersen of Chicago
Lockport, ILPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Custom Window Designs
Glass Doors
Skylights
Double-Hung
Bay Windows
Window Replacement/Installation
Window Nation
Romeoville, ILEducational Website
Services Offered
Double-Hung
Custom Window Designs
Energy-Efficient Options
Vinyl Frames
Bay Windows
Window Replacement/Installation
Glass Doors
Huskie Exteriors
Rockford, ILPrice Transparency
Free assessment
Good Customer Service
Services Offered
Energy-Efficient Options
Window Replacement/Installation
NextWave Construction Windows, Siding, & Doors
Maple Park, ILGood Customer Service
Timely Service
Price Transparency
Free assessment
Services Offered
Energy-Efficient Options
Window Replacement/Installation
ACE Roofing Contractors & Roof Replacement
St. Charles, ILGood Customer Service
Free assessment
Services Offered
Window Replacement/Installation
EXTERIORS Windows & Siding Installers
St. Charles, ILFree assessment
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Vinyl Frames
Great Outlook Glass
Dundee Township, ILFree assessment
Services Offered
Mirrors
Glass Showers
Glass Repair
Window Replacement/Installation
Glass Doors
Schmidt Exteriors, Inc.
Aurora, ILPrice Transparency
Free assessment
Good Customer Service
Educational Website
Services Offered
Bay Windows
Window Replacement/Installation
Custom Window Designs
Energy-Efficient Options
Glass Doors
Vinyl Frames
Your Window Solutions
Lake in the Hills, ILPrice Transparency
Free assessment
Educational Website
Services Offered
Double-Hung
Bay Windows
Glass Doors
Window Replacement/Installation
WarmDreams Windows & Doors
East Dundee, ILEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Glass Doors
Custom Window Designs
Bay Windows
Double-Hung
Energy-Efficient Options
Window Replacement/Installation
BUZ's Windows Replacement & Installation
Algonquin, ILGood Customer Service
Free assessment
Price Transparency
Services Offered
Energy-Efficient Options
Window Replacement/Installation
Wood Frames
Vinyl Frames
Goverla Windows and Doors
Fox River Grove, ILFree assessment
Educational Website
Price Transparency
Services Offered
Bay Windows
Window Replacement/Installation
Energy-Efficient Options
Pocket Windows
Wood Frames
Double-Hung
Glass Doors
Vinyl Frames
Two Panes Glazing, LLC
Wheaton, ILPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Window Repair
Glass Doors
New Edg Window Replacement
Naperville, ILServices Offered
Window Replacement/Installation
Window Repair
Chicago Windows Solutions
Schaumburg, ILFree assessment
Timely Service
Price Transparency
Services Offered
Window Replacement/Installation
Glass Doors
Vinyl Frames
Bay Windows
Double-Hung
BUZ Windows Replacement & Installation
Carol Stream, ILFree assessment
Services Offered
Bay Windows
Glass Doors
Double-Hung
Energy-Efficient Options
Window Replacement/Installation
Hoffman Window Replacement Company
Hoffman Estates, ILPrice Transparency
Good Customer Service
Timely Service
Free assessment
Services Offered
Energy-Efficient Options
Vinyl Frames
Window Replacement/Installation
Rite Way Glass & Mirror
Woodridge, ILGood Customer Service
Educational Website
Free assessment
Price Transparency
Timely Service
Services Offered
Glass Doors
Window Repair
Window Replacement/Installation
Tempered Glass
Mirrors
Glass Showers
Energy-Efficient Options
Screen Repair
Royal Craft Home Remodelers Inc.
Downers Grove, ILEducational Website
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Screen Medix
Palatine, ILFree assessment
Educational Website
Good Customer Service
Services Offered
Glass Doors
Window Replacement/Installation
Screen Repair
Window Repair
Calculate how much you can expect to pay for window installation and replacement in Flagg, IL 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 Flagg Saves You Money
Switching to energy-efficient windows can help improve the comfort of your home and help you save on electricity bills. Here are more details about how switching out your windows could help you:
- Save on power bills: Since energy-efficient windows reduce how much energy you need to heat or cool your home, the switch can help you save about $309 annually on your energy bills in Flagg.
- Decrease your carbon footprint: By using less energy once upgrading to Energy Star certified windows, you’ll also be decreasing your carbon dioxide emissions by about 12%, according to Energy Star.
- Protect your valuables from fading: When you switch to energy-efficient windows that have low-emissivity coatings, your floors, carpets and furniture will fade less because of their ability to filter out damaging UV rays.
- Protect your investment: The older your home is, the more likely it is that getting new windows will benefit you. Older homes usually have windows that are outdated, drafty or maybe even damaged in some way. Updating your windows could help increase the value of your property if you decide to sell.
Estimated Cost of Window Replacement in Flagg
Each window replacement company provides various services and has varying prices depending on several factors.
How Much Do New Windows Cost?
Generally, Flagg homeowners can expect their replacement window installations to range from $250 to $1,200. The most common installations sit at about $600. This is because window installations depend on a variety of factors specific to your home, including the size, material and number of windows you need to install, as well as the location of your property.
Keep in mind that energy-efficient windows may cost more upfront, but Energy Star predicts the upgrade will save you between $101 and $583 a year when replacing single-pane windows and between $27 and $197 per year when installing double-pane, clear glass windows. Your exact savings will vary depending on your local climate, energy rates and individual home characteristics.
Getting free quotes from multiple installers is the best way to find out which one will work best for your budget.
What Services do Window Installers Offer?
The first question to ask yourself when planning a window installation is: Should you get a full-frame installation or a pocket installation?
A full-frame installation is a replacement of the full window. This service involves removing the old window, the windowsill, and the exterior and interior trim. It also involves additional materials, such as insulation and drip edges, which raise 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 (or retrofits) involve installing a new window within its existing frame, which makes pocket installations less labor-intensive and costly. But, if the frame has any rot or deterioration, you should opt for a full-frame installation instead.
Your window installation company will be able to recommend the best type for your project. In Flagg, the decision will mostly be influenced by the efficiency of your home and the condition of your existing frames.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- Member of US Green Building Council
- Manufactures products in-house
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
How We Choose the Best Window Installers in Flagg
EcoWatch reviews are different from other reviews because we examine these companies through a sustainability lens. We have evaluated the top window installers in Flagg mainly based on their energy efficient offerings, as the most sustainable option also benefits homeowners in many ways. Energy Star certified windows can cut your power bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:
Service Area
Since this is a guide for Flagg, we gave more points to companies that serve the city. There are certainly reputable providers that didn’t make the cut because of the low odds that they would serve the average homeowner in Flagg.
Work Quality
When choosing new windows, the quality and range of services often plays just as important of a role in insulation and performance as the type of window you opt for. We do give window installers higher marks if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.
Customer Reviews
Another self-explanatory yet very important review factor is customer feedback. If most customers don’t have positive things to say about their service from a certain window installation company, it won’t be featured on EcoWatch.
Cost
This one is a give-and-take: as with other services, cheap window installers may not provide the highest quality service. On the other hand, we want to make sure we’re highlighting companies that provide a variety of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important to many homeowners. That’s why window installation companies that offer lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Due to Flagg’s climate, homeowners will want to mitigate rot, water damage and low efficiency. We factored in local experience to reflect the ability of Flagg window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.
Flagg, IL Window Replacement FAQs
What is the average cost to replace windows?
The national average cost to install a window is around $600 but can range between $200 and $1,200, based on several factors. The price is usually dependent on the location of your property, the type and material of the window and the size of the window. Also, keep in mind that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
Which type of window is the best?
A window’s energy efficiency depends on several factors, including the quality of the installation and what kind of window it is. Look for Energy Star Certified windows — these are usually 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 the time and patience to do the job right, it’s possible to install your own windows. However, if you don’t have the time or know-how, we recommend hiring a professional.
What time of year is a good time to replace my windows?
Although you can install windows any time of year, warmer weather is typically better for replacing windows. Additionally, it shouldn’t be raining, since rain can make the installation harder.
How long does window installation typically take?
Since the average installation time is 30 minutes per window, around 16 windows can be installed in an 8-hour work day.