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Fiberglass vs. Vinyl Windows

Thinking about buying new fiberglass windows or vinyl windows for your home, but not sure which is the better choice for you? No problem.

Fiberglass and vinyl windows are both excellent choices for windows, but there are some differences that may make one a better choice over the other—depending on your situation.

Read on below to learn more about the major differences between fiberglass and vinyl windows.


Fiberglass windows tend to be more expensive than vinyl replacement windows. Manufacturing fiberglass takes a greater amount of time and expertise than manufacturing vinyl windows—and this added time and labor is reflected in the cost.

Fiberglass windows are highly energy efficient, however, so this cost may be offset over the life of the windows.

Strength and Durability

Fiberglass windows are stronger and more durable than vinyl windows. Unlike vinyl windows, extreme temperatures have almost no impact on fiberglass, so they are less prone to expansion and contraction. This leads to less warping and cracking—which leads to a longer lifespan and better energy efficiency.

Although vinyl windows are generally less durable than fiberglass windows, many leading brands manufacture high quality vinyl windows that are extremely strong and durable.


Both vinyl windows and fiberglass windows are very easy to maintain. Unlike wood windows, neither need to be sanded, painted, or stained to maintain a like-new appearance. A simple cleaning will keep vinyl or fiberglass windows looking new for years.

If you feel that you may want to change the color of your window frames over time, fiberglass is a better choice. Fiberglass frames can be painted, but vinyl cannot.


Both vinyl and fiberglass windows are very energy efficient, making them eco-friendly choices for your home. If you want to have the most eco-friendly windows available on the market, however, fiberglass is the choice. Fiberglass not only provides greater energy efficiency than vinyl windows with comparable features, they require less energy to be manufactured and can be fully recycled after they are replaced.

Fiberglass and Vinyl Windows in MD, DC, & VA

If you are looking for fiberglass windows or vinyl windows in the Washington, DC metro area and would like a window replacement estimate, contact the replacement window professionals at Quality Window & Door today or visit one of our showrooms in Maryland or Northern Virginia.

Simply fill out the contact form on the right or call us at 1-800-370-8751 to request a free in-home replacement window consultation today!

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