Castle Windows: An Andersen Certified Contractor

For nearly 50 years, Castle Windows has helped homeowners replace their windows and patio doors with products they can trust. Today, that trust is backed by an exclusive partnership: Castle Windows is an Andersen Certified Contractor, meaning every window and patio door we install comes from one of the most respected names in the industry.

Why We Chose Andersen for Our Customers

Not every window company can call itself an Andersen Certified Contractor. Andersen only extends this certification to installers who meet its standards for training, workmanship, and customer care — because we believe our customers deserve nothing less than the best.

This certification means:

• Specialized installation training. Our crews are trained specifically on Andersen's product lines, installation methods, and quality standards.
• Manufacturer-backed accountability. As a certified installer, we're held to Andersen's benchmarks for craftsmanship — not just our own.
• One trusted product family. No guessing games about quality tiers or off-brand substitutes. When you choose Castle Windows, you get genuine Andersen windows and doors, installed by a team that knows them inside and out.

The Windows We Install

Castle Windows installs some of Andersen's most trusted window series, both built around Andersen's exclusive Fibrex® composite material — a wood-fiber and polymer composite engineered to be roughly twice as strong as vinyl, while remaining low-maintenance and energy efficient.

Andersen 100 Series

The 100 Series is Andersen's budget-friendly entry point without a budget feel. Built entirely from Fibrex composite, these windows resist warping, fading, and the wear that vinyl windows are prone to over time, all while keeping installation and long-term maintenance costs low. It's an ideal choice for homeowners who want the durability of a premium material without paying premium prices.

Andersen 400 Series

The 400 Series is Andersen's most popular and longest-standing product line — and for good reason. It offers the widest range of styles, sizes, and configurations of any Andersen series we install, from classic double-hung and casement windows to bay, bow, and specialty shapes. Backed by decades of engineering refinement, the 400 Series delivers the performance, versatility, and curb appeal that most homeowners are looking for in a full window replacement project.

The Patio Doors We Install

A patio door does more than let you step outside — it's often the largest single piece of glass in a home, and it needs to perform under real wear and tear. Castle Windows installs Andersen patio doors from three series, each suited to a different combination of style and budget:

100 Series Patio Doors

Constructed from the same Fibrex composite as the 100 Series windows, these gliding patio doors offer a clean, modern look with excellent energy efficiency and minimal upkeep — a smart, durable alternative to standard vinyl sliders.

200 Series Patio Doors

The 200 Series strikes a balance between value and refinement. Depending on configuration, these doors pair a wood interior with a low-maintenance exterior shell, and they're available in both gliding and hinged (French-style) options — giving homeowners flexibility in how their indoor and outdoor spaces connect.

400 Series Patio Doors

For homeowners who want Andersen's most versatile door platform, the 400 Series offers the broadest selection of configurations, panel counts, and finish options. Like its window counterpart, the 400 Series patio door line is built for long-term performance without sacrificing design flexibility.

View These Andersen Product Guides & Photos

Andersen publishes full product guides for each series, along with selection guides that show finished installations. These are worth browsing before your estimate so you can arrive with styles and finishes already in mind.

• Andersen 100 Series Product Guide
• Andersen 200 Series Product Guide
• Andersen 400 Series Product Guide
• Andersen Windows & Doors Selection Guide
• Andersen Patio Door Selection Guide (PDF)

What Andersen Certification Means for You

When you work with a certified Andersen installer like Castle Windows, you're not just buying a window or a door; you're getting a complete system built on decades of manufacturing expertise and installed by a crew trained to Andersen's exacting standards. Every Andersen product we install is backed by Andersen's own warranty coverage for your peace of mind. Visit Andersen's website to learn more about their high-quality windows and doors. 

A Home Improvement Company Serving Families Since 1977

We’ve completed work for more than 1.2 million customers across 11 states. Our longevity matters when a project includes long-term warranty and service commitments. We’ve also received multiple Qualified Remodeler Top 500 designations.

Our customer relationships continue after installation through our service department. That continuity gives homeowners one company for their window and door purchase, installation, and covered warranty service rather than separating those responsibilities.