About Us

DeFinis and Sons is a family business established in 1959. We are meticulous craftsmen offering 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 Window & Door, 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.

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 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' 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.

Home Builders Association
of Bucks/Montgomery Counties

Call Us!

215-624-7118 or 800-322-6177

Get Directions

Visit our huge showroom!
Financing is available
jim@definis.com | sandi@definis.com 
Call Now: 215-624-7118 or 800-322-6177
Do you need professionally installed windows or doors?
super service award

Visit Our Showroom
8312 State Road

Philadelphia, PA 
Monday - Friday: 10:00am - 4:30pm

Wednesday: 10:00am - 7:00pm

Saturday: 10:00am - 3:30pm, Sunday: Closed (Family Day)

(215) 624-7118 or 1-800-322-6177

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