One Window, One Price, in 30 Minutes.

Better Windows, An Honest Price

No Payments, No Interest

Better Windows, An Honest Price

One Window, One Price, in 30 Minutes.

No Payments, No Interest

Our Windows

No gimmicks, fake offers, or inflated retail prices. We give our best price upfront!

Door Installation

Energy efficient, durable, and available in a wide selection of styles and colors.


GreenSky® provides numerous financing options to cover your entire window project.

Why Keystone Is Better & Different

Customer Reviews

Our customers have only good things to say. If we mess up, we make it right!

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Our Map of Successful Jobs and Thrilled Customers, We Have The Experience You Need

I have only the highest praise for Keystone Window. I met with five different vendors when I decided to replace my windows and with each I felt somewhat uneasy that I was being taken advantage of. I dealt with pushy salespeople, pricing that was anything but transparent, and so many choices in materials that I was left with my head spinning. After a family member heard a radio ad for Keystone I decided to add one more vendor to my list and I’m so glad I did. Mike, the salesperson, came out to my condo on a Sunday morning and was extremely courteous and very straightforward. Keystone’s pricing came in thousands of dollars under the quotes provided by other vendors but the quality didn’t suffer. And to top it off, they were able to install my windows early (4 weeks after measurements were taken vs. the 5-8 weeks estimated). I’d highly recommend Keystone! Kaitlin B. of Philadelphia, PA

Our Story

Rob Mato
At Keystone Window of Pennsylvania, we are dedicated to offering the highest quality replacement windows, doors, service, and installations each and every day.

  • The only products we sell are the ones we would put in our own house.
  • We replace windows and doors all year round.
  • We are also proud to offer Andersen® replacement windows.
  • We will never use the high-pressure sales tactics that other replacement window and door companies use.
  • With measuring we are typically in and out in 30 minutes
  • No Interest Financing available

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50 Year Transferable Window Warranty that includes Labor
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  • 97% "Likely to Recommend" Rating from GuildQuality®
  • BBB Accredited with A+ Rating
  • Energy Star Certified Partner
  • lead-safe
  • Featured in Good Housekeeping
  • Earthwise Windows & Doors