When it comes to replacing your windows, you want something that’s not only beautiful but built to last. That’s exactly where Infinity from Marvin stands out. These windows are crafted from Ultrex® fiberglass—a material that’s stronger than vinyl, more durable than wood, and engineered to handle everything the Texas climate throws its way. Infinity from Marvin offers sleek, low-profile frames, clean lines, and customizable finishes that elevate your home’s style while delivering long-term performance.

But with premium quality comes an important question: How much do Infinity from Marvin windows actually cost?

To help you get real answers, we sat down with Ryan “Hooch” Houchen, our Sales Leader here at Southwest Exteriors. In this article, we’ll break down what we learned from that conversation—everything from what drives the cost of these windows to how they compare to other options. Whether you’re replacing one window or planning a full home upgrade, you’ll walk away with the clarity and confidence to make the best decision for your space—and your budget.

What Impacts the Cost of Infinity from Marvin Windows?

When you’re investing in Infinity from Marvin windows, you’re not just paying for a generic window - you’re paying for something that’s tailored to your home, your style, and your long-term needs.

1. Custom Fabrication

Unlike off-the-shelf options, every Infinity window is made to order. There are no standard sizes here, each window is precisely measured and custom-built to fit your home perfectly. This level of precision ensures a seamless fit and beautiful finish, but it also plays a role in the overall cost.

As Hooch puts it, “Really, there is no such thing as standard in our vocabulary…everything is custom fabricated.”

2. Size and Style

Infinity from Marvin prices their windows based on united inches—a simple formula that adds the width and height of the window together. Naturally, the larger the window, the more material and labor it requires, which raises the cost.

The style also matters. More intricate designs like casement or picture windows typically cost more than basic double-hung or single-hung styles. The more complex the design, the more craftsmanship it demands.

3. Aesthetic Customization

Infinity windows offer a wide range of aesthetic choices, and each one affects the price. From frame colors to hardware finishes to grill styles, your selections shape both the look and the cost.

4. Installation Details

At Southwest Exteriors, we don’t just pop in your new windows and call it a day. We include thoughtful details like custom trim work and advanced sealing techniques to ensure everything looks beautiful and performs flawlessly.

We use top-tier caulking materials and sealing methods to keep your windows weather-tight for years to come. While these extras add a bit to the upfront cost, they make a big difference in longevity and peace of mind.

“At Southwest Exteriors, we don’t just install the window—we finish it out to match the quality of the product,” Hooch said. “We use a trim piece that snaps into the kerf—a groove in the frame—to create a seamless, beautiful exterior finish. And we use top-tier caulking and sealing so your install performs as well as it looks.”

5. Quantity and Payment Method

If you’re replacing several windows at once, you’ll benefit from built-in volume discounts. For example, ordering four or more windows can unlock significant savings.

What’s the Price Range for Infinity from Marvin Windows?

Infinity from Marvin windows are a premium investment, but not all windows are priced equally. The total cost depends largely on the level of customization you choose. To make things easier, we’ll break down the cost range into a Low Customization and a High Customization option.

“We don’t call one a ‘basic’ option and the other ‘premium,’” Hooch emphasizes. “All Infinity windows are premium quality. It’s just about how customized you want to get with the design.”

Low Customization vs. High Customization

A low customization option might look like a Single Hung, white frame window with white or brass hardware. That would run you about $3,000 retail – before any discounts are applied. If you add grilles (grids) you would see around a $1,000 price increase.

A high customization option might look like a Casement window with a black frame and matte black hardware, and would run you closer to $3,400. If you add grilles (grids) you would see around a $700 price increase.

At Southwest Exteriors, we offer you a substantial 25% discount if you pay in cash. If you choose a financing option (like, for example, our 6 year, 0% interest option), other discounts are available, depending on which financing option you choose.

No matter which route you choose, you’re getting a top-tier window that will not only last, but still look beautiful and perform well for up to 50 years.

On top of that, we offer a lifetime warranty that covers any and all installation or manufacturing defects for as long as you own your home – yes, as long as you own your home, not the “useful life” of the product.

How Infinity Compares to Other Windows

When you're shopping for replacement windows, it helps to know where Infinity from Marvin lands on the spectrum. Are you paying more than average? Yes—but there's a good reason. Here's how Infinity stacks up against both high-end competitors and budget options, so you can make a confident, informed decision.

Compared to Other High-End Brands

Infinity from Marvin offers many of the same performance and aesthetic benefits as other premium window lines—but at a more approachable price point. For example, Marvin’s own Ultimate series and premium offerings from Andersen can cost two to three times more than Infinity.

Infinity gives you that clean, modern fiberglass frame with high-end energy performance, but without the extremely high price-tag.You’re still getting the same durability and design quality that those top-tier lines offer.

Compared to Budget Options

On the flip side, Infinity is up to three times more expensive than basic vinyl windows from companies like Window World. A budget window might cost $8000–$1,500 installed, whereas an Infinity window typically starts around $2,500 - $3,000 and goes up depending on size and features.

But there’s a tradeoff—and it’s not a small one.

Infinity’s Ultrex® fiberglass frame is eight times stronger than vinyl, is extremely energy efficient, resists warping, fading, and cracking over time, and will perform well for decades. The performance of vinyl windows, on the other hand, declines sharply and rapidly once they’ve been exposed to the Texas sun.

Infinity from Marvin may not be the cheapest option, but it’s far from the most expensive. It lives in that sweet spot—premium performance and custom design, without the ultra-high price tag of full luxury lines.

Common Myths About Infinity from Marvin Windows: What You’re Not Being Told

When it comes to high-performance windows, Infinity from Marvin is often misunderstood—especially by competitors who rely more on scare tactics than facts. At Southwest Exteriors, we’ve seen it all, and Hooch has heard the misconceptions firsthand.

Myth #1: Infinity windows are "overpriced" for what you get.

It’s true—Infinity costs more than a standard vinyl window. But that comparison is apples to oranges. “If you're comparing us to Window World or a big box store, yeah, it's three times more expensive,” Houchen says. “But you’re also getting exponentially better performance, longevity, and aesthetics. That vinyl window starts breaking down the moment it's installed.”

Myth #2: Infinity’s fiberglass corners are weak and prone to failure.

This one comes straight from competitors. “One of the big things other companies like to say is that fiberglass can’t hold up in the corners—that it leaks or separates,” Hooch says. “But in our experience, we’ve never had any warranty claims or failures in those areas.” Infinity windows are built with corner keys, chemical welds, and tight seals that hold strong for decades. “There’s no real evidence to support those claims.”

Myth #3: Fiberglass windows fade in the sun

Infinity’s Ultrex® fiberglass is not only stronger than vinyl—it’s the most durable frame material on the market. Unlike vinyl, which fades fast under long-term UV exposure, Ultrex will keep its color for decades.

When you're investing in something as permanent as new windows, understanding the truth behind the product—and the company installing it—can make all the difference. As Hooch puts it, “Let’s not just spend your money. Let’s spend your money in a way that gives you something you’re in love with every time you look at it.”

The Bottom Line on Infinity from Marvin Windows

Infinity from Marvin isn’t the cheapest option out there—and it’s not trying to be. These windows are built for homeowners who care about long-term value, beautiful design, and top-tier performance. If that sounds like you, then yes—Infinity is absolutely worth the investment.

It’s important to ask the right question when you’re comparing windows. Not just “How much does it cost?” but “What am I getting by paying more?”

With Infinity, the answer is clear:

You’re getting a custom-made product tailored to your home.
You’re getting the unmatched strength of Ultrex® fiberglass.
You’re getting energy efficiency that pays off over time.
And you’re getting windows that will look and perform like new for decades—even in the Texas heat.

Ready to see if Infinity from Marvin is right for your home? Schedule a free, no-pressure consultation with one of our design consultants today—we’ll walk you through your options, answer your questions, and help you design the perfect solution for your space.

How Much Do Infinity From Marvin Windows Cost?