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
EcoWatch Local Advisors

By EcoWatch Local Advisors

Updated January 24, 2025

Why you can trust EcoWatch

Our panel of energy experts work tirelessly to create unbiased reviews and informative content to help homeowners make educated decisions. No other windows site has covered energy efficiency and sustainability as long as EcoWatch, which means we're going to help you find windows replacements that will save on your energy bill and put more money back in your wallet.

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.

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Best Availability

Renewal by Andersen

★★★★★
4.5
  • Great Industry Reputation
  • Award-winning Company
  • Member of US Green Building Council
  • Manufactures products in-house
Save $375 Off Each Window
Get Estimate

Power Home

★★★★★
4.5
  • Uses eco-friendly materials
  • Well-trained, certified installers
  • Lifetime or lengthy warranty
Next-Day Appointments Available
Get Estimate

Best for Residential Windows

Window Nation

★★★★★
4.0
  • 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 logo
Best Affordability

Window World

★★★★★
BBB Rating: A+
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Large serice area
  • Pros icon Low prices relative to competitors
  • Pros icon Great industry reputation
  • Pros icon Lifetime warranty
Cons:
  • Pros icon 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 Windows

Window 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 logo
Best Overall

Renewal by Andersen

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon Great industry reputation
  • Pros icon Award-winning company
  • Pros icon Member of US Green Building Council
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon No lifetime warranty
  • Pros icon 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 Windows

Renewal 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 logo
Best for Residential Windows

Window Nation

★★★★★
BBB Rating: A
Locations: Regional
Founded: 2006
Pros:
  • Pros icon Award-winning company
  • Pros icon Manufactures products in-house
  • Pros icon Custom designs
  • Pros icon Wide variety of products and services
Cons:
  • Pros icon Installation not covered by warranty
  • Pros icon 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 Windows

Window 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, IL
4.9
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Custom Window Designs
  • Service icon Glass Doors
  • Service icon Skylights
  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Window Replacement/Installation

Website: https://www.renewalbyandersen.com/window-company/080-chicago-il/about-us
Address: 14503 S Gougar Rd #800, Lockport, IL 60491
Phone: (866) 836-2764

Window Nation

Romeoville, IL
4.6
★★★★★
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Vinyl Frames
  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors

Website: https://www.windownation.com/chicago_showroom/
Address: 1263 Lakeview Dr, Romeoville, IL 60446
Phone: (815) 306-8024

Huskie Exteriors

Rockford, IL
5.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation

Website: https://huskieexteriors.com/
Address: 4901 W State St, Rockford, IL 61102
Phone: (815) 519-3237

NextWave Construction Windows, Siding, & Doors

Maple Park, IL
5.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Timely Service
  • Pros icon Price Transparency
  • Pros icon Free assessment

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation

Website: http://www.nextwaveil.com/
Address: 5N290 Wooley Rd Unit A, Maple Park, IL 60151
Phone: (630) 454-5689

ACE Roofing Contractors & Roof Replacement

St. Charles, IL
5.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment

Services Offered

  • Service icon Window Replacement/Installation

Website: http://www.ace-roofs.com/
Address: 8 N 3rd St Suite #3, St. Charles, IL 60174
Phone: (630) 444-7575

EXTERIORS Windows & Siding Installers

St. Charles, IL
5.0
★★★★★
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Vinyl Frames

Website: http://sidingstcharles.com/
Address: 110 N 4th Ave, St. Charles, IL 60174
Phone: (331) 210-9164

Great Outlook Glass

Dundee Township, IL
5.0
★★★★★
  • Pros icon Free assessment

Services Offered

  • Service icon Mirrors
  • Service icon Glass Showers
  • Service icon Glass Repair
  • Service icon Window Replacement/Installation
  • Service icon Glass Doors

Website: http://greatoutlookglass.com/
Address: 35W113 Frontenac Dr, Dundee Township, IL 60118
Phone: (224) 409-4421

Schmidt Exteriors, Inc.

Aurora, IL
5.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service
  • Pros icon Educational Website

Services Offered

  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Custom Window Designs
  • Service icon Energy-Efficient Options
  • Service icon Glass Doors
  • Service icon Vinyl Frames

Website: http://www.schmidtexteriors.com/
Address: 1585 Beverly Ct # 116, Aurora, IL 60502
Phone: (630) 406-0444

Your Window Solutions

Lake in the Hills, IL
5.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Double-Hung
  • Service icon Bay Windows
  • Service icon Glass Doors
  • Service icon Window Replacement/Installation

Website: https://4yourwindowsolutions.com/
Address: 8411 Pyott Rd #111, Lake in the Hills, IL 60156
Phone: (833) 367-9687

WarmDreams Windows & Doors

East Dundee, IL
5.0
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Free assessment
  • Pros icon Good Customer Service

Services Offered

  • Service icon Glass Doors
  • Service icon Custom Window Designs
  • Service icon Bay Windows
  • Service icon Double-Hung
  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation

Website: https://warmdreams.us/
Address: 206 Christina Dr, East Dundee, IL 60118
Phone: (312) 414-9298

BUZ's Windows Replacement & Installation

Algonquin, IL
5.0
★★★★★
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Price Transparency

Services Offered

  • Service icon Energy-Efficient Options
  • Service icon Window Replacement/Installation
  • Service icon Wood Frames
  • Service icon Vinyl Frames

Website: http://replacementwindowsalgonquin.com/
Address: 1435 Geringer Rd, Algonquin, IL 60102
Phone: (224) 689-8046

Goverla Windows and Doors

Fox River Grove, IL
5.0
★★★★★
  • Pros icon Free assessment
  • Pros icon Educational Website
  • Pros icon Price Transparency

Services Offered

  • Service icon Bay Windows
  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Pocket Windows
  • Service icon Wood Frames
  • Service icon Double-Hung
  • Service icon Glass Doors
  • Service icon Vinyl Frames

Website: https://www.goverlausa.com/
Address: 601 Hunters Way, Fox River Grove, IL 60021
Phone: (847) 630-6444

Two Panes Glazing, LLC

Wheaton, IL
5.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Good Customer Service
  • Pros icon Free assessment
  • Pros icon Educational Website

Services Offered

  • Service icon Window Replacement/Installation
  • Service icon Energy-Efficient Options
  • Service icon Window Repair
  • Service icon Glass Doors

Website: https://www.twopanesglazing.com/
Address: 5 Wheaton Center #220, Wheaton, IL 60187
Phone: (630) 488-9280

New Edg Window Replacement

Naperville, IL
5.0
★★★★★

    Services Offered

    • Service icon Window Replacement/Installation
    • Service icon Window Repair

    Website: http://windowsreplacementnaperville.com/
    Address: 1717 N Naper Blvd #200, Naperville, IL 60563
    Phone: (773) 676-0659

    Chicago Windows Solutions

    Schaumburg, IL
    5.0
    ★★★★★
    • Pros icon Free assessment
    • Pros icon Timely Service
    • Pros icon Price Transparency

    Services Offered

    • Service icon Window Replacement/Installation
    • Service icon Glass Doors
    • Service icon Vinyl Frames
    • Service icon Bay Windows
    • Service icon Double-Hung

    Website: https://www.chicagowindowssolutions.com/
    Address: 1421 Wright Blvd, Schaumburg, IL 60193
    Phone: (773) 754-5645

    BUZ Windows Replacement & Installation

    Carol Stream, IL
    5.0
    ★★★★★
    • Pros icon Free assessment

    Services Offered

    • Service icon Bay Windows
    • Service icon Glass Doors
    • Service icon Double-Hung
    • Service icon Energy-Efficient Options
    • Service icon Window Replacement/Installation

    Website: http://windowscarolstream.com/
    Address: 513 Concord Ln, Carol Stream, IL 60188
    Phone: (630) 716-2120

    Hoffman Window Replacement Company

    Hoffman Estates, IL
    5.0
    ★★★★★
    • Pros icon Price Transparency
    • Pros icon Good Customer Service
    • Pros icon Timely Service
    • Pros icon Free assessment

    Services Offered

    • Service icon Energy-Efficient Options
    • Service icon Vinyl Frames
    • Service icon Window Replacement/Installation

    Website: http://hoffmanwindowinstallation.com/
    Address: 760 Hill Dr #311, Hoffman Estates, IL 60169
    Phone: (224) 385-1658

    Rite Way Glass & Mirror

    Woodridge, IL
    5.0
    ★★★★★
    • Pros icon Good Customer Service
    • Pros icon Educational Website
    • Pros icon Free assessment
    • Pros icon Price Transparency
    • Pros icon Timely Service

    Services Offered

    • Service icon Glass Doors
    • Service icon Window Repair
    • Service icon Window Replacement/Installation
    • Service icon Tempered Glass
    • Service icon Mirrors
    • Service icon Glass Showers
    • Service icon Energy-Efficient Options
    • Service icon Screen Repair

    Website: http://www.ritewayglass.com/#!contact/ccyf
    Address: 6750 IL-53, Woodridge, IL 60517
    Phone: (630) 960-4420

    Royal Craft Home Remodelers Inc.

    Downers Grove, IL
    5.0
    ★★★★★
    • Pros icon Educational Website
    • Pros icon Free assessment
    • Pros icon Good Customer Service

    Services Offered

    • Service icon Window Replacement/Installation

    Website: https://royalcraftremodelers.com/
    Address: 1525 Ogden Ave, Downers Grove, IL 60515
    Phone: (630) 725-1000

    Screen Medix

    Palatine, IL
    5.0
    ★★★★★
    • Pros icon Free assessment
    • Pros icon Educational Website
    • Pros icon Good Customer Service

    Services Offered

    • Service icon Glass Doors
    • Service icon Window Replacement/Installation
    • Service icon Screen Repair
    • Service icon Window Repair

    Website: http://www.screenmedix.com/
    Address: 546 E Northwest Hwy Suite 105, Palatine, IL 60074
    Phone: (847) 495-8292
    Flagg Window Cost Calculator

    Calculate how much you can expect to pay for window installation and replacement in Flagg, IL using our customized window cost calculator.

    Estimated Window Cost:
    161 homeowners have requested a free estimate in the last 3 days.

    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.

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    Best Availability

    Renewal by Andersen

    ★★★★★
    4.5
    • Great Industry Reputation
    • Award-winning Company
    • Member of US Green Building Council
    • Manufactures products in-house
    Save $375 Off Each Window
    Get Estimate

    Power Home

    ★★★★★
    4.5
    • Uses eco-friendly materials
    • Well-trained, certified installers
    • Lifetime or lengthy warranty
    Next-Day Appointments Available
    Get Estimate

    Best for Residential Windows

    Window Nation

    ★★★★★
    4.0
    • 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.