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.

Visit our HUGE showroom!

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.

We Have Earned National Best Of The Best Award

With over 50 years of experience providing custom windows and doors, DeFinis And Sons Windows & Doors has become the largest window and door installation company serving the Delaware Valley. In need of new windows or doors? Look no further! No one comes close to our knowledge, expertise, and professional installation.

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

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!

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