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Top-Rated Window pros in Winnebago - Updated Nov 2026

Avatar for Mad City Windows & Baths
Mad City Windows & Baths
4.4(
838
)
New Windows - 6 +New Windows - 3-5New Windows - 2

Serving Winnebago, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2001

Free estimates

Warranties offered

"The installers were wonderful. Friendly, knowledgeable, fast and CLEAN! Youâ d barely know theyâ d been there!. And our sales person really helped us understand the best, but not most expensive windows for our house. If I need more windows they will be back!"
windows
siding
siding
siding
windows

+20

Response time10 mins
7982 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Danny's Window Cleaning
Danny's Window Cleaning
5.0(
10
)
Window Cleaning

Serving Winnebago, IL and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

We help homeowners and businesses in the Janesville and surrounding areas keep their properties looking their best and protected from damage. From streak-free windows and clean gutters to driveways, siding, decks, and patios restored with pressure washing — we do it safely, efficiently, and with attention to detail.\nLicensed, insured, and focused on quality results every time.\n

Sun room
Sun room
Green house side
Green house top
Front doors

+2

12 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Mad City Windows & Bath - Madison
Mad City Windows & Bath - Madison
New to Angi
New Windows - 2New Windows - 3-5

Serving Winnebago, IL and surrounding areas

Approved

In business since 2001

Free estimates

Warranties offered

To learn about Mad City Windows and its history, you need to start back in 1998 when our family-owned company first opened its doors and changed the face of home remodeling in Wisconsin. From the beginning, our business has been built on a foundation of friendship and trust and, in return, local homeowners have come to know they can place their trust in us. In order make certain that we consistently earn that trust, we are dedicated to ensuring the expert, seamless delivery of high-quality products and remodeling solutions to homeowners throughout our service area. \n \nToday, we expand our home remodeling expertise across Wisconsin, Minnesota, Iowa and Illinois. With over 50,000 completed projects, we take our 2+ decades of experience to serve the communities of Minnesota, Iowa and Illinois. They can expect our highest standard of service and professionalism.

Testimonial Letter(s)
Home Exterior + Bath
Home Exterior + Bath
Home Exterior + Bath
Home Exterior + Bath

+19

Infinity Exteriors
New to Angi
New Windows - 3-5New Window - SingleNew Windows - 2+1 more

Serving Winnebago, IL and surrounding areas

Approved (Corporate)

In business since 1997

Free estimates

Credit card accepted

At Infinity Exteriors, we set ourselves apart through our unwavering commitment to quality, craftsmanship, and customer satisfaction. Our comprehensive services include roofing, siding, windows, and gutters, all delivered with meticulous attention to detail. Our team consists of seasoned Project Advisors, Managers, and Installers who bring years of industry experience, training, and a dedication to high standards, ensuring every project meets our strict quality guidelines. \n \n

39 neighbors recently requested a quote
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Windows FAQs, answered by experts

Use a high-quality caulk with silicone around your windows, as it’s waterproof and shrink-proof. Or, you can use a caulk consisting of polyurethane or acrylic if you want to be able to paint over it. Caulk made from silicone is not paintable. Avoid using inexpensive caulk that has a resin or oil base. These caulks will not last long and may shrink and pull away from the window as temperatures go up and down.

A good U-factor for windows is 0.30 or lower, but they can range from 0.20 to 1.20. A general rule of thumb when it comes to the U-factor is that the lower, the better.

In short, it depends. After 20 years, the glass in your windows is less energy efficient, which can cause increased electricity bills. You might also see signs of water damage or natural wear and tear over the years. However, with proper maintenance, some window frames can last up to 50 years, so you may only need to replace the glass to save on energy. 

At the same time, window replacement is a major investment, so replacing the glass in rooms most impacted by outdoor temperatures is one way to avoid going all-in to replace your windows.

In some cases, you might need a permit for a window replacement, which is hard to get if you’re not a professional contractor. You should probably just hire a window replacement company in the first place because the job is complicated and can be dangerous for the average DIYer. You may not even save any money doing it yourself because contractors purchase materials wholesale.

There are many signs to look out for that tell you it’s time to replace a double-hung window. If the window is drafty and inefficient, you may need a new window to block out air leaks and keep your utility bills from skyrocketing. Other signs that it’s time to replace a window include foggy glass, soft or broken window frames, or window sashes that won’t open or close easily.

The Winnebago, IL homeowners’ guide to window services

From average costs to expert advice, get all the answers you need to get your job done.