| REVIEWS |  |
BEST WINDOWS | |
WINDOWS PRICES | |
STYLES |
Home : Recommendations : Best Fiberglass Windows
Best Fiberglass Windows
Explore our recommendations and opinions on the best fiberglass windows on the market. Certainly there are other options out there but these are four selections that we like and feel offer the consumer some good value for their money. Use our window cost estimator to find accurate pricing on fiberglass windows.
Get Our Recommended List
Best Fiberglass Windows :: Alpen 925
The Alpen 925 fiberglass window is the premium series that gets up to a 9.1 R-value through a quadruple pane glazing, a foam filled main frame, as well as a number of additional energy saving features. With the 9L glass package, the 925 casement achieves a 0.15 U-factor, .22 SHGC and .34 VT and gets some 99% UV blocking. The 925 window is available as a fixed frame, casement, awning, sliding patio door, half circle, several geometric shapes or as a bay or bow window.
There are a number of consumer options to choose from, including 8 different hardware materials (including an oil rubbed bronze and brushed nickel), 5 simulated divided light designs, as well as an array of paint and/or finish options. Explore all of our Alpen Windows reviews here.
Installed DH Pricing: $1300
Sunrise Restorations Series
The Sunrise Restorations window is more of a hybrid between a vinyl and fiberglass. The frame is vinyl, but it uses a fibercore reinforcement along the sash and meeting rail. A really high end window that combines the best of both worlds; a narrow frame, strength, great energy efficiency numbers, and a "reasonable" price tag.
The window includes a great tilt sash mechanism, and high transparency screen. Expect a U-value of 0.27 and air infiltration of 0.04, all in a very nice looking package. This window tops the list of both vinyl and fiberglass. It's a true double threat and a great all around window! Vinyl vs Fiberglass Windows
Installed DH Pricing: $950
Marvin Infinity Series
The Marvin Infinity comes in either a full Ultrex fiberglass frame or an Ultrex clad model with an interior made of Everwood, a wood veneer that looks great but doesn't require the maintenance that real wood needs. A thicker frame and more bells and whistles explain most of the price difference between it and the Integrity. It also has a nicer finish and a better warranty, which covers 20 years for the glass and lifetime for everything else. It's really regarded as a top notch window.
Installed DH Pricing: $1650
Marvin Infinity Window Price Bid
Hi Dane, we are replacing 16 double hung, 2 pictures, one 2 door slider, one octagon and are converting a 3 door configuration to 3 lite slider. Six of them require tempered glass.
Marvin Infinity is $40,000
Sunrise Solace is 36,000
Soft lite Classic is 34,000
Polaris Ultraweld EN PS 8000 series is 3000 (cash price).
What are your recommendations and opinions of the windows. Three of these seem very reputable and have excellent warranties on labor,etc. If I were to choose Sunrise, it would entail engaging a different company. This has been a difficult process with long-winded salesmen. Thank you for any help with the decision we need to make.
Peggy - Homeowner - from 2021
[Site Editor's Answer]
Peggy, for me the best value is the Polaris UlraWeld. (I’m assuming the cost is $30K) This is a fantastic window, easily as strong in quality and craftsmanship as the Sunrise Solace and better than the SL Classic.
Assuming that the company doing the install with the Polaris has a good to great reputation, this would be the selection that I would make.
Dane - Site Editor - from 2021
Best Fiberglass Windows :: Marvin Integrity Series
The Marvin Integrity is the company's low end fiberglass window. There are two varieties, either a full Ultrex or a wood interior with Ultrex cladding. They have fewer options when it comes to color, hardware, etc. Most insiders would recommend the Infinity, which has a lot more features and better ratings without being a lot more expensive. It comes with the Cardinal glass package, which has a 20 year warranty on the glass, lifetime frame coverage and 10 years for defects. The cost is reasonable for a good fiberglass clad wood window.
Installed DH Pricing: $1650
Milgard Ultra Series
The Ultra, Milgard's fiberglass window frame, is decent but often rated behind Marvin's Integrity and Infinity when looking at fiberglass. It doesn't have the curb appeal of some competitors, but it does have a great option for a real wood interior. The warranty is very good and it's a great choice if you really want fiberglass but can't quite afford the Marvin window option.
Installed DH Pricing: $1500
Best Fiberglass Windows :: Inline Windows
Inline produces quality fiberglass window and seem to really stand behind their work. Their windows are expensive and they offer a number of different styles that all have a different Series name (this is why we didn't recommend a particular series or model). They use good quality glass with high SHGC that helps optimize passive solar energy. The company has a base window and price that does not include any upgrades. All upgrades are priced out a la carte so the prices can really jump for a high end product. They are out of Toronto California and their distribution is more regional than the other fiberglass windows.
Installed DH Pricing: $1850
Best Fiberglass Windows Q and A
Fiberglass Windows vs. Vinyl
Great, thank you for the information! Would you ever recommend fiberglass to get the improved durability over vinyl, but with better energy efficiency than aluminum? Also, I'm assuming a pocket fit installation would be just fine vs. a full frame installation?
Thanks so much.
Kathryn - Homeowner - from 2023
[Site Editor's Answer]
Kathryn, I have two videos on youtube that discuss your two questions pretty well I think -- if you check them out would you mind hitting subscribe to the channel? I'm trying to get the numbers up :)
Retrofit vs Full Frame Installation Video
Fiberglass Windows vs. Vinyl
Dane - Site Editor - from 2023
Fiberglass Window Companies vs. Aluminum
Hi Dane, looking for replacement windows for central Florida. I would like slimmer frame profile suggestions, should I go with aluminum frames again?
I currently have white aluminum single panes (installed around 1999 from previous owner). I have struggled with getting these because of the green look of low e double paned windows and energy savings versus the cost.
I have a 2400 square foot block home, a hip roof with a three foot overhang built in the mid 1960s.
Three face the east (one is a double paned Anderson vinyl/wood interior casements done around 2009 when the kitchen was redone, it does not appear to have a green tint and I don’t recall what series it was. I also have a side entry singled paned glass door. The east side windows and door were well shaded until we had to take down a huge tree on that side due to damage from a lightening strike a couple of years ago. The tree shaded half of the roof on the east as well. Our electric bill has gone up since we lost that tree.
Four windows face west ( two are small 25x25 bathroom windows). Two of them are shaded from a tree on that side.
South facing window x 1, double paned patio door set x 2 on the back of the house are under a covered porch that do not get direct sunlight.
North facing is a glass single paned entry door and office window under a covered porch. Two other windows and a large window (made up of three) face north as well under the three foot overhang.
Is there a way to get a low e coating that doesn’t show up green? When I drive around neighborhoods I can tell who has new windows because they appear green. I dislike the green look. Do different manufactures have different colored low e coatings?
How much savings can I expect in my monthly electric bill if I change out my windows to double pane? Is there a way to determine cost vs. length to recoup cost?
I was thinking of just doing the windows and side entry door on the east side of the house since they have the most exposure to the sun since we lost that tree. Any thoughts?
Thank you in advance for your time.
AC - Homeowner - from 2023
[Site Editor's Answer]
AC, I probably wouldn't go with an aluminum due to the energy efficiency numbers, but aluminum is strong as hell. The Sunrise Restorations is one of the best fiberglass windows out there -- although it's really like a hybrid of vinyl and fiberglass. Full fiberglass is an option but it will run you 30% more than vinyl, but these tend to be slimmer. If the low-e looks green to you -- that's an issue. Ask whoever comes out to bring window samples for you to look at and ask if they will bring glass samples if they have them.
[Email dane@replacementwindowsreviews.co for his recommendations]
Dane - Site Editor - from 2023
Fiberglass Window Recommendations
Dane, I have 3 steel doors, 32 X 80, 36 X 80 and a 72 X 80 swing in patio door that I want to replace with fiberglass doors. We have looked at Neuma doors and they seem to be a well-made option. I think my preference would be to go with a slider rather than a hinged French model, but not sure if there is a great difference in thermal efficiency between the styles.
Also have a 66 X 96 single pane picture window that I would also like to replace with a fiberglass unit with two side windows to allow some ventilation. The remainder in the house are Amsco windows that will also eventually be replaced with fiberglass. What are your recommendations? Thank you.
Keith - Homeowner - from 2022
[Website Editor Answers]
Keith, the slider would have better energy efficiency than French doors. My list of the best fiberglass windows includes the Sunrise Restorations, Marvin Essentials, Marvin Elevate, Marvin Infinity, Inline Windows, and the Milgard Ultra Series.
You might want to look at a top tier vinyl window -- they have better energy efficiency numbers over most of the fiberglass models above --
[Email dane@replacementwindowsreviews.co for his recommendations]
Dane - Website Editor - from 2022
Best Fiberglass Windows List
Good morning. Your website is really helpful.
I live in the PNW on Puget sound. We currently have wood casements but want to replace them all with fiberglass windows. Some of the wood windows are no longer functional. And I want to keep the fiberglass trim around the windows as slim as possible. More view, less blocking!
Who are your recommended brands that I should consider. Thank you very much for your time.
Michele - Homeowner - from 2022
[Website Editor Answers]
Michele, my favorite fiberglass windows include the Alpen 925 Series, Sunrise Restorations Series, Marvin Infinity Series, Marvin Integrity Series, Milgard Ultra Series, and Inline Windows. Hopefully a couple of these options will be available in your area!
Tim - Site Editor - from 2022
Recommended Fiberglass Windows
Hi Dane, thanks for your website. I'd love to see the list of recommended fiberglass windows. We're replacing original aluminum windows on a mid century house, and we were looking at Marvin Essentials but realized we couldn't replicate the grilles. Do you have a recommended window that has a similarly narrow profile and more flexibility in design?
Thanks!
Tiffany - Homeowner - from 2022
[Website Editor Answers]
Tiffany, here are some fiberglass windows, however I don't know enough about the "flexibility in design" part of the equation (as it pertains to your project.) I would take a look at the Sunrise Restorations Series. A great option, narrow, and some of the best performance data of the bunch -- it's a mix of vinyl and fiberglass...
Sunrise Restorations Series
Marvin Infinity Series
Marvin Integrity Series
Alpen 925
Inline
Milgard Ultra Series
Dane - Website Editor - from 2022
Favorite Fiberglass Casement Windows
Dane-the review site said to email you directly to get an updated list of your favorite brands and options -i am especially interested in fiberglass casements.
John - Homeowner - from 2022
[Website Editor Answers]
John, here are some of the best fiberglass windows on the market:
Sunrise Restorations Series
Marvin Infinity Series
Marvin Integrity Series
Inline Windows
Milgard Ultra Series
Dane - Website Editor - from 2022
Best Fiberglass Windows Cost
We have had many quotes and consultations and are still at a loss as to which window company to use. Prices are all over the place. Window World quoted us 7,200-9,200 (not clear on brand -ASI or something) and Champion quoted us 13,500. A local individual quoted us 6,000 (wincore). Are we able to get fiberglass windows for less than 10,000? We have 10 windows to replace in which 3 of those would be sliders; the other seven would be double hung. I need some honest opinion.
Walter - Homeowner - from 2021
[Site Editor's Answer]
Walter, prices are often all over the board for window quotes, which is why I'm always telling homeowners to keep collecting bids until they find a great deal. WW typically uses windows that are builder grade and not a quality product that will last 20 to 30 years. The $6K for the Wincore 5400 series (I'm making the assumption it's not the 7700 series) is a good price on a solid window. If the local individual has online reviews you can check, then I would do that and I would consider it if those reviews were good.
Fiberglass is typically 30% more than vinyl, so it would be difficult to get it for under $10K based on your current bids, but who knows.
Here is my list of good and great brands and options if you want to continue your search...
Tim - Site Editor - from 2021
Marvin Replacement Fiberglass Windows Cost
Hi there, these are my quotes below.
Milgard Price List
70 x 42 horizontal slider cost - $606
84 x 43 horizontal slider cost - $862
72 x 80 sliding door - $1865
Marvin Essentials Price List
79 x 42 horizontal slider cost - $1302
84 x 43 triple sash cost - $1817
72 x 80 sliding door cost - $3225
Grand total is 10,953.
Milgard Ultra Price List
Ultra sliding door cost - $4912 with tax
Lisa - Homeowner - from 2023