Get the most durable fiberglass window on the market. Window replacement from start to finish

Replacement Windows

Boost the value of your home with energy-efficient fiberglass replacement windows. Custom-made for a flawless fit.

Patio Doors

Patio doors designed and constructed to defend your home from Colorado weather, day in and day out.

Entry Doors

Our entry doors feature unsurpassed quality and style to create the perfect focal point for your home.

Storm Doors

We have a wide variety of storm doors that can be customized to your home. We also offer door installation.

Siding

We offer James Hardie fiber cement siding with multiple options and styles, exemplifying our commitment to elegance and endurance.

Bi-Fold Doors

Bi-Fold Doors provide clean lines and more glass, without compromising performance. Featuring the widest panel doors in the industry, these doors fold open to offer wide-open views.

WINDOW INSTALLATION SERVICES

We are committed to providing you with great windows, superior installation, and exceptional results.

DOOR REPLACEMENT SERVICES

Create the perfect design for your home with a new patio door or front door. From color, to glass and hardware, find your ideal look with our many style and design options.

JAMES HARDIE SIDING

The Right Products Make All The Difference. Make Your Home Uniquely Yours with James Hardie Siding.

The Infinity from Marvin Advantage

Expands 87% less than vinyl – resists expanding and contracting in any climate
8 times stronger than vinyl – protects the integrity of your home
Resistant to leaks, seal failures and stress cracks – all things that can affect energy efficiency

Ultrex’s fiberglass windows and doors strength delivers narrow profiles for expanded views and more daylight
Our proprietary acrylic finish is fade-resistant and virtually maintenance-free
We offer a complete collection of styles, features and options to complement any home

Colorado’s Oldest Infinity from Marvin Retailer

We’ve Been Installing Windows and Doors For Over 49 years

If you’re a homeowner living in Denver and need replacement windows or doors, reach out to the oldest Infinity from Marvin dealer in Colorado – Gravina’s Window Center of Littleton.

About Us

Customer Testimonials

“Gravina’s Window Center of Littleton supplied and installed 8 Marvin Infinity windows a pair of French doors for us. The windows look good and work well. They replaced trim and painted everything. We are very pleased with the job and highly recommend.”

MICHAEL MURPHY

“Gravina’s has been an absolute pleasure working with from the initial evaluation and meeting with Justin and John. To Lisa helping me find the ebony color that looks amazing on my house.”

BRIAN SMITH

“Our experience with Gravina’s was first class in all areas from the sales force to the installers! The sales staff really listened to what we wanted and gave us exactly what we asked for – NO PRESSURE here. A very comfortable experience.”

TOM HARTLEY