We are OPEN for business! Call today to a schedule a consultation!
We've changed our name! To better describe our commitment to superior service, SI Windows - Phoenix is now

You're Important to Us!


Thank you for visiting our website and I sure hope we can earn your business.

An observation about Phoenix, Scottsdale, Fountain Hills, Paradise Valley, Gilbert, and valley area homeowners, they’re cave dwellers!  Shutters, blinds, drapes, shades and sunscreens are all what we call “Advil” for terrible heat conducting windows.  If this describes your situation, it’s time to get your view back!

capstone replacement windows in scottsdale az 1024x791

I think it’s fair to say that most homeowners we talk with are frustrated at the scattered information they get from on-line research.  It’s simple, instead of making your decision based on a couple of lengthy, grinding, in-home presentations and gimmicky “triple lifetime warranties”, let science and common sense lead you to literally the finest engineered window frame and replacement solution that is made in the United States, Infinity from Marvin’s Ultrex fiberglass frame.

For most folks, engineering comparisons like tensile strength, CTE, AAMA 624 ratings, and flexural modulus aren’t common decision-making factors, but they really should be!  Infinity from Marvin’s fiberglass frame is a thermoset, which means it becomes permanently hard and rigid when heated or cured.  Vinyl frames and hybrid vinyl composite frames are thermoplastics. Thermoplastics have the property of softening when heated.  Consider a plastic pool toy or a plastic lawn chair, at best they only last a few seasons.  Do plastic window frames with continuous glass pressure weight seem like a good idea in the desert?

Infinity from Marvin replacement windows will “remodel your home with new windows” and be durable enough for Arizona’s extreme climate.  Please take the time to schedule a consultation and learn about Infinity from Marvin and our obsessive desire to make our customers experience amazing!

Let’s build something together.

Get in touch!