Replacement Windows | Infinity from Marvin Windows

Consult with us today for your fiberglass window or door replacement needs. We’re happy to help!

Fill out my online form.

Reasons to Replace Your Windows

Moisture issues and water damage:  If you’ve seen water between glass panes, leaking, water stains, or evidence of wood rot - those can be signs that excess moisture is accumulating where you can’t see it. This can lead to damage, including mold, mildew, and warping. While some condensation is normal, an excess of moisture often points to a problem.

Energy efficiency and comfort:  If you have to wrap up in a blanket just to sit near your windows, it may be time to think about energy efficiency. Newer windows and doors can eliminate invisible drafts and inconsistent temperature swings — saving you an average of $301-$783 a year.*

Not working properly:  Older windows have a tendency to refuse to open or have a hard time closing. This is an early sign of problems to come. You may be able to fix the issue with cleaning or repairs, but save yourself the headaches and consider new options. Since broken windows and doors are entry points into your home, you’ll want to address them immediately.

Recommended Replacement Windows

Replacing windows and doors can seem like a confusing and time-consuming process. Infinity from Marvin  is the number one fiberglass replacement windows and doors we recommend.  Infinity is focused on streamlining your experience from start to finish — all to help you get the perfect windows for your home. Because some decisions should only be made once.


What to expect

Prior to installation:   Make a plan to know who will be home when the window installation team arrives and how to keep children and pets safe and sound. Plus, do an assessment of your curtains/blinds, furniture, rugs, and other items that may need to be moved on installation day.

Day of installation:  Do a walk-through with the installation team to point out special considerations of your home — both inside and out — where the crew may be working.

Post-installation:  Before the installation team leaves, inspect the area, and make sure everything has been cleaned up to your satisfaction. They’ll walk you through how to operate your new windows and doors.


Window Inspiration

Every room has possibilities. Infinity offers window styles, colors, and features that bring these possibilities to life. Our revolutionary Ultrex® fiberglass material matches durability with performance. Browse our collection and know that each of our window styles is customizable to get the exact look you want.


Door Inspiration

Inviting the world into your home never looked so good. Infinity doors create striking and seamless transitions, outside and in. With customizable styles, colors, and features, our doors offer endless possibilities for your home. Enjoy smooth operation and lasting durability with our Ultrex® fiberglass doors.

Will replacement windows add value to my home?

Installing new energy-efficient windows can reduce your heating and cooling bill, improve the appearance of the exterior of your home, and give you year-round comfort for you and your family. Prices vary widely on replacement windows depending on material, features, options and installation quality. To break your project into affordable payments — or tackle your project in phases as your budget allows — financing options are available. Plus, when selling your home, new windows and doors provide an average 73% return on investment* which ranks higher than most interior renovations. Investing in replacement windows and doors from Marvin Infinity, without a doubt new windows add value to your home.

What window is best for my home in Colorado?

Here's the best part - we offer Marvin Windows full line, including Marvin Infinity windows.  Infinity from Marvin is the best fiberglass replacement window on the market.  No one but Marvin has the Patented Ultrex fiberglass that the Infinity window is made of.  And we have the proof.

When is the best time to replace your windows and doors?

We install all year long so that is up to you when you want your windows installed.

What is the installation process?

Whether this is your first time, or you’ve replaced in the past, Gravina's Window Center of Littleton wants to help answer those and many other questions you may have.  We have been around a long time and have seen almost every window remodeling situation. Why not let our expertise and longevity help you in planning your window replacement project?


As a Infinity from Marvin Diamond window replacement dealer, our customers know what they are going to get. We are a remodeling and home improvement contractor serving Colorado residents since 1973. We offer a comprehensive portfolio of home improvement services which include consultation, Marvin Windows, Infinity from Marvin replacement windows, Marvin patio doors, fiberglass entry doors, and James Hardie Fiber Cement Siding.  Regardless of whether you need a simple update or are interested in adding a whole-house renovation, we know you will be satisfied with your new windows and doors to match, Gravina’s can deliver for you.


* “2017 Cost vs Value Report” Remodeling,