If you are shopping for replacement windows in Knoxville right now, you have probably gotten a quote that made you put the paper down and walk away for a minute.
You are not crazy. Window prices have climbed hard. And the way most of the big companies sell makes it very difficult to tell whether you are getting a fair number or not.
So let us just put it all on the table. What the big brands cost. Why they cost that. What we sell instead. And where we are honestly not a better fit, because there are a couple of places where we are not.
First, the Big Three Actually Make Good Windows
We want to start here because a lot of local companies will not say it.
Andersen, Pella, and Marvin are three of the most respected window manufacturers in the country. They have been around for over a hundred years each. They have real engineering behind them. If you buy one and it is installed correctly, you are going to have a good window.
We are not here to tell you their products are junk. They are not.
What we are here to explain is where your money actually goes when you buy one, because that is a very different conversation.
What These Brands Cost in 2026
Here are the ranges being reported by cost guides this year. Your actual quote depends on your window count, your opening sizes, and how much trim work your house needs.
| Brand or Line | Typical Installed Cost Per Window | Frame Material |
|---|---|---|
| Renewal by Andersen | $1,500 to $5,000 | Fibrex composite only |
| Andersen 100 Series | $400 to $650 | Composite |
| Andersen 400 Series | $600 to $950 | Wood with vinyl cladding |
| Andersen A-Series | $900 to $1,400 | Wood with aluminum cladding |
| Andersen E-Series | $1,200 and up | Full custom |
| Pella | $550 to $2,500 | Vinyl, fiberglass, or wood |
| Marvin | Premium end | Clad wood and fiberglass |
Renewal by Andersen
Commonly reported at $1,500 to $5,000 per window installed. A whole house project of 10 to 15 windows frequently lands between $15,000 and $35,000.
Andersen (the main brand, not Renewal)
This one surprises people, because the numbers are very different.
- 100 Series, which is their composite line: roughly $400 to $650 per window installed
- 400 Series: roughly $600 to $950 per window installed
- A-Series, wood and aluminum clad: roughly $900 to $1,400 per window installed
- E-Series, full custom: $1,200 and up
Pella
Roughly $550 to $2,500 per window installed depending on the series and the frame material. Pella’s own published installed range runs about $800 to $2,200.
Marvin
Marvin sits at the premium end. They are best known for clad wood and fiberglass, and those materials carry a higher price than vinyl or composite no matter who builds them.
Wait. Why Is Renewal by Andersen So Much More Than Andersen?
This is the single most useful thing a Knoxville homeowner can understand before they take a sales appointment, so read this part twice.
Andersen and Renewal by Andersen are not the same purchase.
Andersen Corporation is the manufacturer. You can buy Andersen windows through lumber yards, dealers, and builders.
Renewal by Andersen is their replacement window division, and it is sold and installed through a network of independently owned affiliates. When you sign a Renewal by Andersen contract, you are contracting with that local affiliate business, not with Andersen Corporation directly.
That model has real costs baked into it:
- Heavy national advertising, which you have definitely seen
- Fees paid up the chain by the local affiliate
- A commissioned in home sales process, usually a long appointment at your kitchen table
- Pricing that generally comes only after an in home consultation, not from a published price list
None of that is illegal or shady. It is a business model, and it is a model that has put a lot of good windows in a lot of houses.
But every one of those costs lives inside the number on your quote. You are not just buying a window. You are buying a share of the advertising and the sales infrastructure that brought that window to your kitchen table.
One more thing worth knowing. Renewal by Andersen sells one frame material, a composite called Fibrex. If you want vinyl, or wood, or fiberglass, they are not the company for that. That is not a knock. It is just a fact about what is on their menu.
So What Do We Sell?
Tennessee Window and Door Works is an authorized Knoxville dealer for Home Guard Industries, a family owned window manufacturer in Grabill, Indiana.
Home Guard has been building doors and windows for over 40 years. Still family owned. They describe themselves as debt free. They build in a 170,000 square foot plant on 22 acres in a town of about 900 people.
Grabill is known for its custom cabinet shops and hand work, and that is the labor pool building your windows. Home Guard calls what they do Amish craftsmanship, and they define it as precision, discipline, and pride in every detail. No shortcuts, no compromises.
We can install other brands too, and we will quote them if you ask. Home Guard is our main manufacturing partner because it is the window we believe in most.
If you want the full breakdown of who Home Guard is and what is inside their windows, we wrote all of it down on our Home Guard partnership page.
Jeff Ludy at The Window Experts, who reviews window brands on YouTube and does not sell Home Guard, called them a “boutique” manufacturer focused on quality, service, and innovation. He says in his video that he takes no payment for his reviews. You can read his full write up here.
Here is his walkthrough of the Innovations line:
An Honest Apples to Oranges Warning
We are going to be straight with you about something most comparison articles will not admit.
Home Guard builds vinyl windows. Renewal by Andersen builds Fibrex composite. Marvin and Pella’s premium lines are clad wood and fiberglass.
Those are different materials. Comparing them on price alone is not a fair fight, and any company that tells you their vinyl window is identical to a clad wood Marvin is not being honest with you.
What we will tell you is this. For the overwhelming majority of Knoxville homes, a well built vinyl window with good glass is the right answer. It performs. It does not rot. It does not need painted. And it costs a fraction of clad wood.
Where vinyl is not the right answer is a historic home with strict architectural requirements, or a homeowner who specifically wants real wood on the interior. In those cases, go look at Marvin. We will tell you that to your face.
Where a Home Guard Window Competes Hard
Now here is where we think we win on the merits, not just on price.
The Glass Is From the Same Tier as Anybody’s
There are over a thousand window makers in the United States. There are only a handful of companies that make the glass. Cardinal Glass is widely regarded as the best of them.
Home Guard uses Cardinal insulated glass units. The glass comes in more than one package. Which one is right for you depends on the direction the window faces and how much sun it takes. We bring the ratings with us and go through them with you in person, so you do not pay for glass you do not need.
The Frame Is Not Hollow and Not Cheap Vinyl
Home Guard uses premium virgin vinyl, never recycled. Recycled vinyl costs less and is more likely to yellow, warp, and get brittle. The frames and sashes are thick walled and precision welded at the corners to keep air and water out.
The frames are insulated with Insul-Core rather than left hollow. The corners are fusion welded, so they are one piece instead of screwed together. And the meeting rail is reinforced with Innergy, a soy based composite. Home Guard states it performs 700 percent better than aluminum, and the reason you would want composite rather than metal there is simple: metal conducts heat straight through your window. Composite does not.
The Seal Is the Part That Matters Most
Windows do not usually die from the frame. They die at the seal. Once the seal fails, moisture gets between the panes and you have that permanent fog.
Home Guard reports that in independent lab testing simulating 50 years of heat and cold cycling, their Conservision and Endur combination failed at 0.5 percent, while conventional single seal butyl units failed at 55 percent.
That is Home Guard’s published figure from their own testing, and we are giving it to you as their claim rather than as an independent finding. What we will add is that they put a lifetime seal failure warranty behind it, and no manufacturer warranties something they expect to come back.
The Warranty Covers Broken Glass
This is the one that gets people. The Home Guard warranty covers accidental glass breakage for as long as you own and live in the home. Kid puts a baseball through it, that is covered. It also covers the vinyl, the moving parts, the sealed glass unit, and the screens. Like any warranty it has terms and limits you should read. We bring the full document to your free in home consultation and go through it with you before you sign a thing.
FlexScreen Comes Standard
Every Home Guard window ships with FlexScreen. It is the spring steel screen that was on Shark Tank. It squeezes in, pops out, and does not kink like the flimsy aluminum frame screens you have been fighting with. Home Guard says they were the first licensee in the world.
The Real Difference Is Where Your Money Goes
Let us say it plainly.
When you buy from a national brand through an affiliate or franchise network, your price covers the window, the install, the national ad budget, the fees paid up the chain, and the commission for the rep who spent three hours in your kitchen.
When you buy from us, your price covers the window and the install.
We are a local Knoxville company buying direct from the plant. There is no franchise taking a cut. There is no television budget. We grow because people in Farragut and Powell and Maryville tell their neighbors, and that is a marketing plan that costs us nothing and costs you nothing.
We went deeper on what changes when you hire a local company instead of a national one here: Local vs. national window companies in Knoxville.
We wrote out that whole chain in plain terms. Read why we buy direct from the manufacturer.
Seven Questions to Ask Every Window Company
Take this list to every quote you get, including ours.
- Ask for the NFRC label on the exact window being quoted. Whole window U-factor and SHGC, not center of glass.
- Ask who makes the glass. If they cannot tell you, that tells you something.
- Ask whether the vinyl is virgin or recycled.
- Ask if the corners are fusion welded or mechanically fastened.
- Ask for the warranty document, not the warranty summary in the brochure. Read the transfer terms and read whether labor is covered.
- Ask whether the price expires. A real price does not drop twenty percent because you said you want to think about it.
- Ask who is doing the installation. A great window installed badly is a bad window. In our experience installation quality is the single biggest factor in whether you are happy in five years.
If another company answers all seven of those better than we do, hire them. We mean that.
Come Look at One
We will bring a real Home Guard window to your house in Knoxville. Not a brochure. You can open it, lock it, tilt it in, and hold it next to the window you have now.
Then we give you one number, written down, that does not change.
Want to know more about the window first? Read about our Home Guard partnership.
Get My Free Quote or call (865) 300-4884
Prices in this article reflect published cost guide ranges as of 2026 and are not quotes. Your price depends on your home. Last updated September 2026.