Dependable And Professional
Window And Door Experts

Definis And Sons Windows & Doors is your one-call solution for a wide range of replacement Windows and Doors. Our dependable and uniformed technicians are fully insured professionals.

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.

Come See Our Window And Door Showroom!
Located in Northeast Philadelphia

Definis And Sons Windows & Doors has received the Angie’s List Super Service Award every year since 2010 including this year! Definis And Sons is rated A + by the Better Business Bureau and has received hundreds of 5-star reviews.



Best Of The Best Winner 2024 With Rich Noonan

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.



A Nice Bay Window Install

June 21, 2020

Near Krewstown in Northeast Philadelphia, the Definis and Sons team was at it again, this time we removed four older Double Hung Windows from a twin style home and installed a beautiful custom Platinum Bay Window with a Prairie grid pattern between the glass. We finished off an improved look with a shed style pent roof which was installed above along with black panel shutters.

Our Latest Improvement Projects