Andersen Windows

Compare Window Products, Installation & Warranty Coverage

Homeowners considering Andersen windows need more than a product name. The right replacement depends on the opening, frame condition, window style, glass, material, installation method, and warranty coverage.  is an Andersen Certified Contractor, providing residential replacement window estimates and installation for Andersen products backed by Andersen's own warranties.

We’ve served homeowners since 1977 and completed work for more than 1.2 million customers across 11 states. That experience helps us identify the practical questions that should be answered before you select a window or installation provider.

Understanding Andersen Window Series & Materials

Andersen product families include the 100 Series, 200 Series, 400 Series, A-Series, and E-Series. These names are useful starting points, but product availability varies by provider. Materials, configurations, finishes, glass options, and intended applications vary among the series. Andersen also publishes an Andersen Window Selection Magazine as well.

Some Andersen products use Fibrex composite, a material Andersen developed from reclaimed wood fiber and thermoplastic polymer that the company states is twice as strong as vinyl. Other products incorporate wood, vinyl, aluminum, or combinations of materials. Rather than choosing by series name alone, consider how the complete window fits your opening and meets your preferences for appearance, maintenance, and operation.

Our own replacement window offerings include double-hung, casement, slider, garden, bow and bay, awning, specialty, transom, and basement hopper windows. Castle Windows-branded windows are designed, engineered, tested, and manufactured in our North American factories. Andersen windows are manufactured separately by Andersen Corporation and installed by Castle Window's Andersen Certified Contractor crews.

What It Means to Choose an Andersen Certified Contractor

Not every installer who sells Andersen products has earned Andersen Certified Contractor status, and the distinction affects both the quality of your installation and the warranty protection behind it. 

To earn and keep Andersen Certified Contractor status, an installer must complete Andersen's hands-on installation training, meet Andersen's installation standards and program requirements, and maintain ongoing access to Andersen's product support and technical resources. Certified Contractors receive continued product information and on-site support directly from Andersen. 

That certification carries a direct benefit for homeowners: when an Andersen Certified Contractor installs your windows, Andersen backs the installation itself with a 2-year limited warranty, separate from and in addition to the manufacturer's warranty on the windows. An installer without certified status can still sell Andersen products, but the installation isn't eligible for that coverage — worth confirming when you compare quotes. 

Castle Windows holds Andersen Certified Contractor status. Our installation crews have completed Andersen's training, and installations are eligible for the certified installation warranty described below.

Why Homeowners Choose Andersen

Andersen has designed and manufactured windows since 1903 and holds more than 100 patents for innovations that have shaped the window and door industry, including Perma-Shield cladding and Fibrex composite material. 

Independent brand research backs up that track record. Andersen has been the most-used window brand among builders for 25 years and among remodelers for 17 years, and Andersen Corporation was named a 2024 ENERGY STAR Partner of the Year. Homeowners and contractors consistently rank Andersen among the most trusted and most recommended window and door brands. 

Andersen also backs its products with ongoing support after installation: more than 200 trained call center agents, 24/7 online support, and a nationwide network of roughly 1,000 service providers available for on-site needs.

Frequently Asked Questions

How Does Castle Windows Install Andersen Replacement Windows?

Castle Windows is an Andersen Certified Contractor, meaning its installation crews have completed Andersen-specific training and follow the manufacturer's installation standards. The installation process includes preparing the opening, setting and securing the window, insulating and sealing the perimeter, completing necessary finishing work, and checking operation.

What Andersen Window Series Does Castle Windows Install?

Castle Windows installs select Andersen products, including the Andersen 100 Series and 400 Series. The available materials, configurations, finishes, glass options, and other features vary by product series and project. During an estimate, the team can help determine which available Andersen products fit your home's openings and requirements.

What Is the Difference Between Andersen 100 Series and 400 Series Windows?

The Andersen 100 Series uses Fibrex composite material, while the 400 Series can combine a natural wood interior with a low-maintenance exterior. The two series also differ in available styles, configurations, finishes, and other design options. Comparing the specific features and installation requirements can help determine which series is appropriate for a particular opening.

Are Andersen Windows Energy Efficient?

Andersen windows are available with different glass and configuration options designed to support energy efficiency. Actual performance depends on the selected window, glass package, installation, existing opening, and other characteristics of the home. Castle Windows can discuss available Andersen options as part of a replacement window estimate.

What Is Fibrex Material in Andersen Windows?

Fibrex is an Andersen composite material made from wood fiber and thermoplastic polymer. Andersen uses Fibrex in products such as its 100 Series windows. The material is designed to provide durability while requiring less maintenance than traditional painted wood.

Can Andersen Windows Be Customized?

Yes. Andersen windows are available with different styles, configurations, colors, finishes, glass options, hardware, and other features, depending on the product series. The appropriate choices can vary based on the existing opening, architectural style, ventilation needs, and desired appearance.

Does Castle Windows Provide a Warranty for Andersen Windows?

Andersen windows installed by Castle Windows are covered by Andersen's applicable limited product warranties rather than Castle Windows' lifetime warranty for its own vinyl windows. Andersen's warranty terms vary by product and component. Andersen Certified Contractor installations may also receive separate coverage for the installation itself, so homeowners should review the applicable warranty documents for complete terms and exclusions.

What Does Andersen Certified Contractor Mean?

An Andersen Certified Contractor has completed Andersen's installation training and meets the requirements of its certified contractor program. Certification provides installers with product information, technical resources, and access to Andersen support. For homeowners, it also means the installation is performed by a contractor trained specifically to work with Andersen products and installation methods.

How Much Do Andersen Replacement Windows Cost?

The cost of Andersen replacement windows depends on factors such as the product series, window size, style, glass, materials, configuration, customization, number of windows, and installation requirements. Because these factors can vary substantially between homes, a project-specific estimate is the best way to determine the expected cost.

How Do I Get an Estimate for Andersen Replacement Windows?

Castle Windows offers free estimates for replacement window projects. An estimate provides an opportunity to review the existing openings, discuss Andersen window options, compare configurations and installation requirements, and understand the applicable warranty coverage before deciding whether to proceed.

Start with a Clear Window Comparison

Request a free estimate to discuss your replacement goals, review applicable window options, and confirm whether Andersen products are currently available for your project. Our team can provide a clearer basis for comparing materials, styles, installation scope, and Andersen's warranty coverage.