Castle Windows - Mid-Atlantic offers premium replacement windows and doors, expert installation, and a true lifetime warranty.
Mechanicsburg Window & Door Company
Delivering Expert Craftsmanship & Quality Service Since 1977
At Castle Windows - Mid-Atlantic, we're proud to be your trusted choice for high-quality windows and doors. Whether you want to replace your drafty, outdated windows or elevate your security and curb appeal with a new entry door, you can turn to us with complete confidence.
But windows and doors aren't all that we do. Our expertise extends to roofing and siding, too. No matter the job, we source high-quality products and use proven craftsmanship techniques to deliver results that are made to last.
If you're ready to start your window project or another home improvement, reach out today. We offer free estimates and financing. Plus, we back our work with an unbeatable lifetime warranty.
Reach out today to request a free estimate and get your window, door, siding, or roofing project started.
The Trusted Window & Door Provider
Choose The Window People

We've Partnered with Andersen Windows & Doors
As a leader in the window and door industry, it made perfect sense for us to partner with Andersen. Their products are made for the long-run. In fact, Andersen's proprietary Fibrex® material has twice the strength of standard vinyl. This means windows and doors that stay strong, no matter what the weather brings.
Not only does our partnership give you access to Andersen's proven products, but it also means tour team is specifically trained to install and service them. This matters because even the best windows or doors will underperform if they're installed improperly.
When you want the best, choose a company that's partnered with the best. Go with .
How Can We Upgrade Your Windows & Doors?
We install a wide array of windows and doors that we can customize based on your home's architecture, your personal style, and any other need. If you can envision it, we can make it a reality. Check out some of our past work to see what our team of experts can do for you.
More Ways to Love Your Home
Beyond windows and doors, we're your go-to for siding updates and roof installations and replacements. Across all our services, we strive to deliver real value for our customers. We do that by improving curb appeal, elevating energy efficiency, and providing long-lasting security.

What to Expect From Our Installation Process
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1Consultation
We start with an in-home consultation, where we'll assess your needs and budget and walk you through your product options.
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2Design & Product Sourcing
We'll help you choose the perfect design for your windows, doors, or any other product. Then, we'll source your products, making certain that they meet each and every one of your specifications.
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3Installation
When installatin day comes, we'll work meticulously to deliver results that enhance your home's beauty, longevity, and security.
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4Cleanup/Ongoing Care
To finish each job, we asses our work, clean any messes, and provide tips for ongoing care. If something isn't quite right, all you must do is give us a call.
Why Choose Castle Windows - Mid-Atlantic
Castle Windows - Mid-Atlantic has provided expert-level home improvement services for decades. When you work with us, you'll get the following.
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Certified Andersen Partners
Professional installation from a Premier Andersen Certified Contractor
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Professional Installation
Our installation team has extensive experience as well as the knowledge and tools needed to ensure a precise fit.
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Our Unbeatable Lifetime Warranty
At Castle Windows - Mid-Atlantic, we offer a TRUE lifetime warranty on all our windows and doors, covering both products and labor, ensuring your peace of mind and setting us apart in the industry.
What Our Customers Say
72,000+ verified reviews across the country. Here's a few from this week.
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Installation and window quality
"We had 4 new doors installed and they are not only beautiful but function great."
MMarietta Dantonio-Madsen Verified Customer
Castle Windows Bring New Life to Your Home
Enhance your home's beauty and security with Castle Windows - Mid-Atlantic. Contact us for a consultation with our skilled specialists and start transforming your home into the castle you've always dreamed of. Experience the Castle difference today!
FAQs About Window and Door Replacement
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Are all-wood windows a good choice for an older or historic home?
They can be a good architectural fit where natural materials, traditional proportions, and existing trim are important. The project may also require attention to sash dimensions, decorative details, opening condition, and local preservation requirements. A consultation can help determine whether repair, an insert window, or full-frame replacement better fits the home and project goals.
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Is installation work available year-round?
Yes. Our installation crews work year-round. Ask about shifts, employment classifications, and seasonal workloads for a specific position.
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How do awning windows compare with casement windows?
Both styles open outward, but awning windows are hinged at the top while casement windows are hinged at the side. The better fit depends on the opening, preferred ventilation direction, privacy needs, exterior clearance, and how you want to operate the window.
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Are Castle Windows locations independently operated?
We can’t confirm from the available information whether individual locations are independently operated or managed through one corporate structure. Contact us directly if the operating structure or responsibility for service in your area affects your project or warranty request.
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Does Raynor provide a residential garage door warranty?
Raynor warranty coverage varies by product, component, purchaser, property type, and installation circumstances. Review the manufacturer’s written warranty for the exact product selected. Also confirm whether the installer provides separate coverage for labor or installation-related concerns, since manufacturer and installer responsibilities aren’t necessarily the same.
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What is the difference between double-hung and single-hung windows?
Both styles have vertically arranged sashes. A double-hung window allows both the upper and lower sashes to move, while a single-hung window typically has only one movable sash. The appropriate choice depends on ventilation preferences, cleaning access, design, budget, and the existing opening.