Frederick, MD's Custom Home Remodeling Professionals

Reliable Professional
Window Contractors
in Frederick, MD

Windows can provide an excellent return on investment while keeping your home safe and secure for years. Connect with us for a free estimate.

Window Installation, Replacement, and Repair in Frederick, MD Starts here

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Great-looking windows add more than just light and air to your home. They add value and lots of other benefits too.

  • Enhanced protection and security
  • Improved energy efficiency
  • Better health and safety
  • Serious curb appeal
  • Increased value of your property


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1. Enhanced Protection And Security

Crime is more likely to occur if the windows in a building are rusted, corroded, or otherwise damaged. Choosing the correct windows can also help to limit noise which means you can enjoy more peace and quiet.

2.Improved Energy Efficiency

Windows can keep the cold out and the heat in; they can also do the opposite by keeping the cool air in and the hot air out. In both cases, energy efficiency is improved resulting in lower bills.

3. Better Health And Safety

Well-fitted windows prevent moisture and pests from getting into your home. Subpar frames won’t stop either of these, leading to structural and health issues like mold and insects. 

4. Some Serious Curb Appeal

New windows are among the most influential home features in raising the resale price and attracting buyers – who will be glad to know they won’t need to be replaced any time soon.

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Affordable Window contractor Services in Frederick, MD

Windows are a fantastic investment since they increase the value of your property while making it look better and improving security. Our top-quality window services will suit any budget and we offer some excellent finance options too, with 0% interest for up to 18 months.

When you choose Diligent for your window installation, replacement, or repair, you can expect:

  • High-quality brands like ProVia, Slocomb, and Harvey
  • Premium quality materials
  • Top-notch warranties
  • 0% financing for 18 months for qualified customers
  • Buy five new windows and get the sixth free

Windows for Any Style of Home

You can choose from a wide range of window types and styles that can be tailored to your needs. To help you picture how different types of windows would look on your house, contact us to find out more about ProVia.


Top hinged, outward-opening windows that allow plenty of ventilation.


The Casement is a classic side-hinged window, with an outward-opening design.

Double Hung

Vertically opening windows that allow both the top and the bottom parts of the window to move.


Windows that extend out from your home to provide shelving and side vents for growing plants.


These are large, single-panel windows. They don’t open but they look amazing and let light flood in.

Check out our gallery to see our work and contact us for your free estimate. 

Learn More About Our Window Replacement Services in Frederick, MD

Contact us today to find out how the Diligent Exterior Remodeling team can improve your home with energy-efficient, attractive windows.