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  • Average homeowner rating star icon4.7
    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
7731 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

Windows may need to be replaced after a hurricane if they’re severely damaged. For example, if you have windows with blown-out glass and a cracked frame, they will need to be replaced. It’s a similar story if you have windows with noticeable water damage. However, if your window pane has small cracks but the frame is still in good condition, you may be able to repair the window.

Yes, with modifications or the use of adapter kits for tricky placements.

Sometimes, you can buy windows directly from the manufacturer, and it may be cheaper than buying through a third party or wholesaler. Manufacturers may also offer more options, including custom shapes and features, or better warranties if you purchase through them directly. 

However, some companies limit the ability to buy from them, especially if you need standard pre-fabricated sizes, so don’t expect this service from every manufacturer.

The most common types of window frames include frame and sash, metal or aluminum frames, composite frames, fiberglass frames, vinyl frames, wood frames, glass or glazed frames, and insulated frames. Frames can also be categorized by operating types, such as awning frames, single/double-sliding frames, fixed frames, casement frames, and single/double-hung frames.

Whether you need a permit to install a bay window depends on the project's scope. Replacing an existing bay window typically does not require a permit. However, if you are adding a new bay window, requirements can vary. Adding a new bay window to the front of your house usually requires a building permit, while adding one to the side or back of your house often does not. It's always best to check with your local municipality to confirm the specific requirements in your area. Additionally, if you live in a historic district, you should consult your neighborhood association to ensure your project complies with their construction guidelines. If you're unsure about the process, a professional can provide guidance.

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.