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Fiberglass vs Vinyl Windows: Which is Best?

6 minutes

Differences Between Vinyl & Fiberglass Windows

There are several types of window materials to choose from when deciding what windows are best on a new construction home or looking for replacement windows in previously built home. The most common types of window material frames that homeowners see as being the best  are either vinyl or fiberglass. These two are the most common for their affordability, durability, and energy efficiency. In this article we will show you the differences between vinyl and fiber glass including the strengths and weaknesses of both.  

What is The Cost Difference 

Comparing the cost, vinyl is significantly less expensive than fiberglass. Vinyl windows are around 10-30% less expensive than fiberglass including installation. The reason why installation is cheaper for vinyl is because it is much easier to install, and manufacture compared to fiberglass and wood.  

Vinyl windows are much more flexible and there is more give and take with measurements. Whereas fiberglass is much more rigid and needs to be much more exact with measurements. The installation of fiberglass windows is a little more difficult and you will need an installer that really knows what they are doing. This results in a premium cost for installation.  

Options and Styles 

Vinyl windows come in a wide range of styles, colors, finishes and decorative options and are sometimes available in a wood look choice without the maintenance of wood. At DaBella our vinyl windows come in almost every style of windows you could think of including sliding glass doors, double-hung, casement, garden window, picture windows, bay & bow windows, etc.  

Fiberglass windows also come in a wide array of styles and finishes as well. Most fiberglass window manufacturers offer the same type of styles that most other materials can fit. Something that also is great about fiberglass is that the frame is a lot thinner and not as visible as other materials. If you are looking for the maximum amount of light to come through fiberglass might be a desirable choice for you if you are willing to pay the premium.  

Difference Between Vinyl and Fiberglass Windows

Energy Efficiency Differences 

Vinyl windows are made of polyvinyl chloride and are equipped with ultraviolet light stabilizers that make the vinyl resistant to breaking down under significant heat. Vinyl has proved to be very energy efficient and will have their max efficiency for many years to come. The insulated frames make vinyl windows an excellent choice for those looking for their windows to pay themselves off. Vinyl windows come in either double pane or with even added energy efficiency and cut the amount of noise pollution.  

While vinyl windows are environmentally friendly, the R and U value of fiberglass is slightly better and more energy efficient. Fiberglass itself has been used for over 100 years as an insulator in homes. Fiberglass windows also come in either double pane or triple pane options.  

Fiberglass vs Vinyl Windows Cost

Vinyl windows offer several advantages, especially in terms of cost-effectiveness without compromising on durability and energy efficiency. Compared to fiberglass windows, vinyl windows typically come at a lower upfront cost, making them a more budget-friendly option for homeowners.

One of the primary benefits of vinyl windows is their affordability. They are generally more cost-effective to manufacture and install compared to fiberglass windows, making them an attractive option for those looking to upgrade their windows without breaking the bank.

Despite their lower cost, vinyl windows still offer excellent durability and energy efficiency. Modern vinyl windows are engineered to withstand various weather conditions, including extreme temperatures, high winds, and moisture exposure. They are also resistant to rot, corrosion, and insect damage, ensuring long-term performance and minimal maintenance requirements.


The durability of DaBella’s vinyl windows is exceptionally good and should last in your home for a lifetime. The mechanisms of our vinyl windows should last the lifetime of your home as well. The wonderful thing about our windows is that they come with a limited lifetime manufacture warranty so you can be assured that your windows will be protected for the lifetime of your home.  

Fiberglass windows are slightly more durable because the material does not tend to warp or bend under extreme heat. They can also last the lifetime of your home if you do take proper care of them. They do tend to require quite a bit of maintenance.  


The remarkable thing about vinyl windows is that they do not require maintenance ever depending on the area you live in. If you live in an elevated temperature area and you notice that the insulation around your window starts to crack, you may need to caulk your windows to restore their full energy capabilities.  

If you do not like the original color of your fiberglass windows, the wonderful thing is that you can paint fiberglass. But if you do paint them, at some point the paint will begin to crack and peel and will require to be repainted if you live in a high heat area.  

Are Vinyl or Fiberglass Windows Better for My Home? 

Vinyl and fiberglass are both great options for your next window replacement project. But since DaBella has industry-leading manufacture warranties for vinyl windows you will stay protected for a lifetime. DaBella has options and styles for vinyl windows for any kind of budget and our installation process is much quicker, easier on your home and cheaper than a fiberglass windows installation. While being virtually maintenance free, strong durability and energy star rated energy efficiency. Vinyl windows are the obvious choice for those looking for a high-quality product at a reasonable price.  

Contact DaBella for Your Next Window Replacement 

DaBella has been transforming the home improvement experience for homeowners for the last 11 years. We believe that the home improvements experience should be easy to understand, knowledgeable and make you feel comfortable with your final decision. With over 20,000 projects completed last year, DaBella is the go-to home improvement contractor you can trust with an outstanding track record of completed projects. We provide lifetime limited manufacture warranties that will keep you protected so that you can keep your peace of mind.  

DaBella offers roofing, siding, windows, gutters and bathtub and shower replacements to homeowners in our 35 offices across 13 states. If your home is showing signs of age or distress and you are looking to add curb appeal and lasting value, contact us today at 844-DaBella and get a complimentary quote. Our home improvement specialists are standing by and are ready to show you the possibilities for your home.

Steven Shortridge

District Manager

Portland, OR

Learn more about Steven