About Us

DeFinis And Sons Windows & Doors is a family run business established in 1959. We are meticulous craftsmen providing personalized consulting and expert installation of vinyl replacement windows, steel entry doors, security storm doors, aluminum storm doors, and sliding patio doors.

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No matter what type of window or door you have in mind, we offer a comprehensive selection and will provide recommendations based on your personal preferences. At Definis And Sons Windows & Doors, you'll be presented with a variety of window and door options allowing you to choose the perfect fit for your home. We are a leader in this industry because windows and doors are our specialty. Contact us or visit our showroom and discover the difference with DeFinis And Sons Windows & Doors.

Excellence and Professionalism


All of our products come with peace of mind, since we warrant and service everything we sell, which has led us to be able to furnish you with over 42,000 references. In addition, we are able to offer you a free in-home estimate at a time that is convenient for you. No obligation, of course, or we invite you to visit our huge colorful showroom. Taking pride in our work has led us to grow and become the largest Window & Door Installation Company in the Delaware Valley. Our reputation is second to none.

Dealer of the Year


Our Dealer of the Year represents outstanding examples of companies that are committed to customers, community and the health and strength of the window and door business. We received many nominations and the winner was selected following extensive interviews with countless numbers of suppliers, customers and others. DeFinis And Sons Windows & Doors was chosen for its long-track record of leadership and innovation in serving homeowners in the greater Philadelphia market, as well as its overall reputation.

Once again, congratulations on DeFinis And Sons Windows & Doors' achievement!

Nicole Harris
Vice President and Publisher
Window & Door Magazine


Window and Door Magazine is the top trade magazine serving the window and door industry. Their headquarters are located in McLean, VA.

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