Replacement Windows & Doors

25 years of experience serving Maryland, DC and surrounding area.


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The Best Options Suited to Your Needs

With so many products and materials on the market today, making sense of what is best for you and your home can be frustrating and time consuming.  Energy efficiency, warranty, durability, maintenance needs and aesthetics can vary widely from one manufacturer to another. 

At Cozi, we sell and professionally install a wide range of replacement window and door products from the finest manufacturers including:

  • Andersen
  • Marvin
  • Simonton
  • Paradigm
  • Simpson
  • Provia  

Our goal is to provide knowledge and refine the options in order to deliver the best quality and value to satisfy your home improvement needs.  We encourage you to contact us for a free, no-obligation consultation and let our experience and knowledge help guide you to the products that are right for your project. 

After meeting with three window companies, our choice was clear – Cozi Company. From our first meeting, until the project’s completion, we knew we made the right decision. Our best experience with a home improvement contractor by far!

William & Antoinette, Bethesda, MD


We have had several Home Improvement projects in our home over the last few years with no real complaints. Cozi, however, set the new standard for customer service and quality work. We are so happy we found you. Thank you again.

Neil & Beth, Rockville, MD


After working with Cozi in our last home, we had no question who to call for work when we moved. I have no hesitation referring Cozi Company to anyone replacing windows and doors

Lorie, Rockville, MD