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    Average homeowner rating
  • Verified reviews icon89
    Verified window services reviews

Top-Rated Window pros in South Beloit - 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 South Beloit, 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
8261 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for 123 Exteriors
123 Exteriors
5.0(
9
)
New Windows - 3-5New Windows - 6 +

Serving South Beloit, IL and surrounding areas

Approved

In business since 2006

Free estimates

Credit card accepted

"Dominik W. arrived early, took his time explaining everything he was looking at, and walked us through the entire process?from the window demo to the installation. He wasn?t pushy at all, and we ended up choosing to buy from them. If you need new windows, give Dom a call!"
Window
Avatar for Danny's Window Cleaning
Danny's Window Cleaning
5.0(
10
)
Window Cleaning

Serving South Beloit, 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 PoundPros, LLC
PoundPros, LLC
5.0(
11
)
New Window - SingleNew Windows - 6 +

Serving South Beloit, IL and surrounding areas

Approved

In business since 1995

Small jobs welcome

Customers say: Quick response

"Jarrett was wonderful to work with. He kept to his word and on what he was going to do and kept to the price. He gave us ideas and design suggestions on the decks (2) decks. The contractor we had hired when starting the project left with no warning in the middle if it and Jarrett graciously fixed the other contractors poor workmanship to bring it to code and basically had to rebuild decks from the beginning. He did a large basement remodel for my son which turned out beautiful. My son was trying to get some furniture in thru the basement window which had to be removed and replaced. We couldnâ  t get the window out. It was a weekend and he cam eout ion his time right away. We called him for advice initially but he just came out. We have projects we definitely will. be using him for. He also painted some dormers on our very tall house and did an excellent job. Our local painter with 5 stars refused to do it-so wonâ  t ever call that guy again. You will not be disappointed hiring him."
Just starting
Beginning stages
Making Progress
Covering Pipes
Ceiling Tile

+15

Response time50 mins
Recommended by88%of homeowners
Avatar for Performance Exteriors
Performance Exteriors
4.8(
2
)
New Windows - Multiple

Serving South Beloit, IL and surrounding areas

Approved

In business since 2012

Free estimates

Offers commercial services

is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

Response time2 days
Recommended by100%of homeowners
Avatar for Mad City Windows & Bath - Madison
Mad City Windows & Bath - Madison
New to Angi
New Windows - 2New Windows - 3-5

Serving South Beloit, 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

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Windows FAQs, answered by experts

Replacing window glass instead of the entire window is more cost-effective, maintains the frame's aesthetics, and reduces waste. It improves insulation and energy efficiency and can be completed more quickly with minimal disruption to the home.

Yes, professional window cleaning is worth the investment. Regular deep cleanings help keep your windows looking new, extend their lifespan, and boost your home's curb appeal. By removing dirt, dust, and other debris, you can reduce the risk of damage and accelerated wear to window frames and components. It also improves your home’s energy efficiency by keeping insulation and weatherstripping in good working order, potentially lowering your energy bills. Furthermore, annual or bi-annual cleanings can help identify problems like leaks or cracks early, before they escalate into expensive water damage. You can often recuperate the cost of cleaning through energy savings and by avoiding premature window replacement.

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.

The best time to remove and restore old windows is during temperate weather. Late spring and the early onset of winter are ideal seasons. While summer has its challenges (e.g., bugs, heat, and dust), it’s also a good time to do restoration work. The worst time to restore old windows is during the winter, especially if it is particularly cold and snowy.

You should avoid using abrasive materials and harsh chemicals when cleaning windows. Abrasive tools like scrubbing pads, rough cloths, or steel wool can permanently scratch and damage the glass. Harsh chemical cleaners containing alcohol or ammonia can damage window treatments, frame materials, and special features like tinting. It is also best to use distilled or filtered water instead of hard water, which can leave spots or streaks. For best results, use a clean microfiber cloth to wash the glass and old black and white newspapers to dry it without leaving streaks.

The South Beloit, IL homeowners’ guide to window services

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