An independent comparison of the window lines we install most: what each one is good at, where each one is the wrong choice, and what it costs. Written by a company that is not required to sell you any of them.
Schedule Your Free ConsultationEvery window company in Denver will tell you their brand is the best one. They are not lying exactly. They are just answering a question nobody asked, because it is the only question they are allowed to answer.
We are independent. No manufacturer sets our quotas, and nobody upstream cares which line ends up in your house. So we can do the thing the rest of this market structurally cannot: tell you honestly what each of these manufacturers is actually good at, and where each one is the wrong choice.
Read this before anyone sits down at your kitchen table.
We can source dozens of manufacturers. The five we know cold are Sierra Pacific, ProVia, Milgard, Pella, and Amsco.
We know those five cold because we have installed enough of them along the Front Range to know how they behave here after five winters, not because anyone requires us to sell them. That distinction is the entire page.
It is also not a menu you are stuck with. We have installed other lines and can get most of what is on the market. If you have researched a brand, seen something you liked at a neighbor's house, or had a line specified by an architect or an HOA, bring it to us.
The point is not the list. The point is that the list is not a wall.
| Sierra Pacific | ProVia | Milgard | Pella | Amsco | |
|---|---|---|---|---|---|
| Primary materials | Clad wood, aluminum clad | Vinyl, and doors | Vinyl, fiberglass | Wood, clad wood, fiberglass, vinyl | Vinyl |
| Where it sits on price | Upper | Middle to upper | Middle | Middle to upper, wide range across lines | Entry to middle |
| Strongest for | Architectural and historic work, custom sizes and shapes, homes where the wood interior matters | Made-to-order build quality that reads above its price, and the best fit on out-of-square openings. Our first call on entry doors | Straightforward, well-built replacement work with a strong warranty position | Range. There is a Pella line at almost every price point, which is also the confusing part | Value driven whole home projects where window count is high and budget is the binding constraint |
| Where it is the wrong call | A twenty window budget project. The math will not work | Comparing quotes on name recognition, tight budgets, or homeowners set on a wood interior | Homeowners wanting a true wood interior | Assuming all Pella is the same. The gap between their entry and premium lines is large | Historic or architecturally sensitive homes, or anywhere a specific profile is required |
ENERGY STAR certified options are available across all of these, including products certified for the Northern climate zone that covers Colorado. Certification is a floor, not a ranking. Two certified windows can perform quite differently, which is why we show you the actual NFRC numbers on the exact units we quote rather than pointing at a logo.
Clad wood, built by a company that owns its own timber. The interior wood is the reason people choose it, and it is a real reason. If you have a 1920s bungalow in Park Hill or a custom home where the window is part of the architecture, this is usually the conversation.
Where it wins: custom sizes and shapes, historic and design review situations, homes where a vinyl interior would look wrong.
Where it loses: budget. On a twenty window whole home project, Sierra Pacific is often the quote that makes a homeowner sit back in their chair. That is not a knock on the product. It is a real product at a real price. It is just not the right product for every project, and a company that only sells premium clad wood has to pretend otherwise.
The brand on this list most homeowners have never heard of, and the one most likely to surprise them.
ProVia is family owned, based in Ohio, and does not sell through big box retail. Every unit is built to order for the specific opening it is going into rather than pulled from stock and trimmed to fit. That is a genuinely different manufacturing model from most of what gets installed in this market, and where it shows up is the fit. On an older home where no opening is truly square, that matters more than any number on a spec sheet.
The doors built the reputation and they deserve it. If you are replacing an entry door, ProVia is usually where we start.
But the windows are why this line comes up as often as it does in our quotes. You get build quality and customization that read much closer to the premium tier than the price does, without paying for a wood interior you may not want. For a homeowner who cares about how the window is actually made, and who is not doing an architectural restoration, this is frequently the right answer and almost nobody in Denver is going to put it in front of them.
Where it wins: homeowners who want real build quality without a premium clad wood price. Made-to-order fit on older homes with out-of-square openings. Entry doors, where it is our first call every time.
Where it loses: name recognition. If you are holding three quotes and one carries a brand your neighbor has heard of, ProVia does not win that contest on the yard sign. It is also not the cheapest line here, so if budget is the binding constraint the conversation moves. And if you want a true wood interior, this is not it.
We are not paid to say any of this. That is the point of the page.
The workhorse. Vinyl and fiberglass, well built, straightforward, with a warranty position that is one of the more homeowner-friendly ones in the category.
Where it wins: standard replacement work where you want a well-made window without paying for architectural features you do not need. Fiberglass in particular handles the Front Range temperature swing well.
Where it loses: wood interiors, and highly custom shapes.
The widest range of anyone on this list, and that is both the strength and the trap. Pella makes a premium wood window and Pella makes a value vinyl window, and a homeowner who hears "we're putting in Pella" has learned almost nothing about what is actually going in their wall.
Where it wins: flexibility. There is usually a Pella answer at whatever price point the project lands on.
Where it loses: clarity. If someone quotes you Pella without naming the specific line, ask which one. Then ask again.
The value line. Vinyl, straightforward, and the answer when window count is high and the budget is the binding constraint.
Where it wins: whole home projects where a homeowner needs twenty windows replaced and the premium quote is not happening. Amsco is frequently the difference between doing the job and not doing the job.
Where it loses: historic homes, architecturally sensitive elevations, and anywhere a specific profile or a wood interior is required.
We include this line deliberately. A company that only sells premium product has to tell a homeowner on a budget that they should wait, or borrow more. We would rather put good windows in your house at a price that works.
We can source dozens of manufacturers. These are the five we know cold.
Manufacturer names and logos are trademarks of their respective owners.
Take an actual scenario. A twenty window whole home replacement in Arvada.
On a premium clad wood line, that project can land in the forty thousand dollar range. On a value vinyl line, the same house, same window count, same crew, same install standard, lands closer to the high twenties or low thirties.
If you are talking to a company that only sells the premium line, they have two options when you flinch at the number. Lose your job, or push you at financing until you say yes.
We have a third. We show you both, explain what you are actually giving up and what you are not, and let you pick. Sometimes homeowners go premium. Sometimes they go value. Sometimes they do the premium line on the front elevation where it shows and value on the back.
All three of those are fine answers. They are only available if someone puts all the options on the table.
Whoever you end up hiring, these are the questions that separate a real quote from a number on a page.
We will answer all six for our own quote without being asked. If a competitor will not, that tells you something.
Not sure a window is the whole story? See our window installation or door installation.
Tell us about your house and we will tell you which of these actually fits it, including when the honest answer is the cheaper one.