20 Best Window Companies in O'Fallon, MO (2025 Reviews)

How Installing Energy-Efficient Windows in O'Fallon Saves You Money

Energy-efficient windows can offer benefits in more than one way. Here are a few reasons you may want to take the plunge and make the switch:

• Save on power bills: According to the Department of Energy, heat gained or lost through windows makes up around 25-30% of residential energy use. Upgrading to energy-efficient models can help reduce that amount, therefore saving you about 12% more on your bills.
• Protect your valuables: Many Energy Star certified windows have low-emissivity coatings, which not only provide better insulation for your home, but also filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.
• Protect your investment: When you have an older home, your windows could also be outdated or leaky. Upgrading and repairing your windows is an important part of maintaining your property and its real estate value.
• Decrease your carbon footprint: Because energy-efficient windows improve the insulation in your home, you can lower your indirect greenhouse gas emissions by about 12%, according to Energy Star.

Estimated Cost of Window Replacement in O'Fallon

Each window replacement company offers varying services and has varying costs depending on several factors.

How Much Do New Windows Cost?

Typically, O'Fallon homeowners can anticipate their window installations to range from $250 to $1,200. The average cost is at around $600. This is because of the fact that window installations are based on several factors specific to your home, including the size, material and number of windows you need to replace, as well as where your property is located.

With windows, efficiency is one of the most important factors for most homeowners. Windows with higher efficiency may cost more initially, but by increasing the efficiency of your home — particularly during the summer and winter — they can give you decades of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save O'Fallon homeowners $382+ each year after replacing single-pane windows.

Costs will also vary based on the material of your frame. Aluminum frames are the least expensive. They’re sturdy, light and maintenance-free, but provide poor insulation. Vinyl frames are a bit more expensive and provide good insulation. Composite frames made from wood fibers encased in plastic also offer good insulation and are moderately expensive. Wood frames cost the most and are the most in-demand. They’re also aesthetically pleasing and provide decent insulation for your home.

What Services do Window Installers Offer?

The first thing to ask yourself when planning to replace your windows is: Do you want a full-frame installation or a pocket installation?

A full-frame installation replaces the total window, including the windowsill, frame, trim and the window panes. Because this kind of installation requires more time and labor, it will be more expensive than a pocket installation. A pocket installation entails replacing a window within the frame that’s already there. This means instead of taking out the whole unit and reinstalling it, the contractor will just put the replacement window (also called a retrofit or insert window) into the frame.

Your window installer can help you decide which type of installation you should get.

How We Choose the Best Window Installers in O'Fallon

In our hunt to find the most reliable, eco-friendly window installers in O'Fallon, the EcoWatch Reviews team evaluated dozens of companies before landing on these. Along with energy efficiency, we evaluated several window installers in O'Fallon and ranked them based on the following methodology:

Service Area

Because this is a guide for O'Fallon, we gave more points to companies that serve the city. There are other reputable providers that didn’t make the cut because they wouldn’t be able to serve homeowners in O'Fallon.

Work Quality

When installing new windows, the quality and variety of services often plays just as important of a role in insulation and performance as the brand of window you choose. We do rate window installers higher if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.

Customer Reviews

We analyzed patterns in recent online reviews to determine the companies with the most customer satisfaction, weighted by sample size. Customer satisfaction may be the most important factor, as it indicates the quality of services across nearly every category, including quality of installation, professionalism, cost, quality of parts, warranty and more.

Cost

Cheaper windows don’t necessarily mean better windows, but we know many of our readers want to keep costs as low as possible. When analyzing the prices of providers, we gave higher scores to companies with reasonable prices and accessible financing rather than “cheaper” services.

Warranty

Protecting your investment in new windows is important to many homeowners. That’s why window installation companies that give you lengthy warranties for products, parts and labor rank higher with EcoWatch.

Years of Experience

Because of O'Fallon’s climate, homeowners need to be wary of low efficiency, water damage and rot. We factored in local experience to reflect the ability of O'Fallon window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.