13 Best Window Companies in Capital, IL (2025 Reviews)

How Installing Energy-Efficient Windows in Capital Saves You Money

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

• Reduce your carbon footprint: In Capital, you can reduce your indirect greenhouse gas emissions by about 642 pounds per year when you upgrade to energy-efficient windows.
• Protect your valuables: The low-emissivity coatings on many energy-efficient windows help prevent your floors, carpets and furniture from fading by filtering out UV rays.
• Save on energy bills: According to the Department of Energy, heat gained or lost through windows accounts for about 25-30% of household energy use. Replacing your windows with energy-efficient models can help lower how much energy is used in your home, therefore saving you about 12% more on your bills.
• Protect your investment: The older your home is, the more likely it is that getting new windows will benefit you. Older homes usually have windows that are outdated, drafty or potentially even damaged in some way. Updating your windows could help increase the value of your home if you decide to sell.

Estimated Cost of Window Replacement in Capital

Let’s take a look at the cost of replacing your windows and the types of services you may need for your home.

How Much Do New Windows Cost?

According to our research, the typical cost to install a single window is about $600. However, window installation costs can range from $200 to $1,200 a window. These numbers are based on the specifics of your installation, such as size, number of windows, material, type, the location of your home and more.

It’s also worth keeping in mind that energy-efficient windows will cost more initially, but Energy Star predicts that switching out the windows on your Capital home can mean an average energy savings of $236 to $319 per year for single-pane window replacement, or between $87 to $126 per year for double-pane windows. The amount of money you’ll save by switching to energy-efficient windows depends on your local climate, energy rates and other factors unique to your home.

We advise requesting free quotes from several window companies to find the one that works best for your budget.

What Services do Window Installers Offer?

The first step when planning a window installation is to clarify whether you want a full-frame or pocket installation.

Full-frame installations entail replacing the full window, including the sill, trim and frame. Full-frame installations are necessary when you want a new style or your window has significant deterioration. These installations are more involved and will raise overall costs. Pocket installations (also known as retrofits) are when you replace a window without replacing the frame. Pocket installations are simpler and won’t cost as much, but you can’t do this kind of installment if you have any pre-existing rot or water damage.

If you’re still trying to decide which kind of installation to get, you can ask your installer and get their advice. The decision mostly is influenced by the age of your window frames and if there’s any damage present.

How We Choose the Best Window Installers in Capital

In our hunt to find the most reliable, eco-friendly window installers in Capital, EcoWatch evaluated many companies before settling on these. Along with energy efficiency, we evaluated each installer and ranked them using the following methodology:

Service Area

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

Work Quality

We’re certain that you’re looking for a company to do a great job installing windows. We’ve vetted each installer featured on this list to ensure its technicians are well-qualified and that the company has received lots of positive customer feedback to vouch for its service.

Customer Reviews

We analyzed trends in recent online reviews to determine the companies with the highest rates of customer satisfaction, weighted by sample size. Customer satisfaction may be the most important factor, as it reflects the quality of services across most other categories, including quality of parts, professionalism, cost, quality of installation, warranty and more.

Cost

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

Warranty

As discussed, windows are a hefty investment, so you’ll want to make sure that investment is well protected. Window installation companies that provide lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.

Years of Experience

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