Platinum Pella® Certified Contractor

FIberglass Windows

At Siding Unlimited, we offer the best replacement fiberglass windows for homeowners in the greater Madison and Milwaukee area.

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There's never been a better time to improve your home.

Fiberglass Windows Masterfully Installed for Homeowners in Milwaukee and Madison, WI

Siding Unlimited installs premium fiberglass windows that provide outstanding thermal efficiency.

Milwaukee, Madison, and surrounding areas are known for wide variations in temperature. You could be shoveling snow off your sidewalk in March, and, three months later, slathering on sunblock for a warm-weather lake outing with friends.

These dramatic seasonal shifts are likely why many Waukesha and Milwaukee residents say they wouldn’t live anywhere else. But, no matter where in our beautiful state you live or how you prefer to enjoy the local weather, it helps if your home stays at a comfortable temperature throughout the seasons.

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Why Fiberglass Windows?

Don’t let our name fool you. We started as a siding company in 1994, but through our commitment to exceptional home improvement, we branched out to other remodeling services and have since installed countless fiberglass windows in area homes. Homeowners choose us over our competitors because:
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  • We source our fiberglass windows from Pella®, one of the most respected window manufacturers in the nation.
  • Our fiberglass windows won’t expand and contract with temperature fluctuation as other window materials might.
  • Our windows are available in a range of styles, from classic double-hung to easy-opening casement, and more, to suit virtually any architectural design.
  • We offer optional foam-insulated frames and triple-pane glass for enhanced thermal performance that could lead to appreciable energy savings.
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Awning Windows

An awning window has a top-hinged design and swings outward from the bottom. Explore awning window inspiration and ideas.

Bay & Bow Windows

Bay or bow windows combine multiple windows, creating a curve that extends beyond the exterior walls. Discover inspiration to maximize space and light.

Casement Windows

Discover ideas and inspiration about casement windows. These windows are hinged on one side and swings outward to the left or right.

Custom Windows

Explore specialty windows like French casements, tilt-turn windows, in-swing casement windows and hopper windows.

Double-Hung Windows

Double-hung windows can be raised from the bottom or lowered from the top. Explore ideas and inspiration around adding a double-hung to your home.

Picture Windows

Energy-efficient picture windows, also called fixed windows, are non-operable and offer enhanced security. Look through picture window inspiration.

Single-Hung Windows

Since the top sash is fixed of a single-hung window is fixed, these windows are very energy efficient and easy to operate. See single-hung window ideas.

Sliding Windows

Gliding on a track horizontally, sliding windows require no extra space to operate. Explore sliding window ideas and inspiration.

Specialty Windows

Explore specialty windows like French casements, tilt-turn windows, in-swing casement windows and hopper windows.

Unparalleled Service

We are Wisconsin’s only Platinum Elite Pella® Certified Contractor, which means that we are specialists at installing Pella® windows.
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Only our trained employees, not subcontractors, will install your windows, so you can count on receiving meticulous workmanship that ensures a weather-tight fit and reliable operation.

Want to know more about the fiberglass windows we install? Contact Siding Unlimited today, or visit our vast showroom in Waukesha, where we have life-size window samples on display.

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Why should I replace my home windows?

Energy Efficiency

ENERGY STAR® certified windows conserve energy to help you save on utilities.

Improve Comfort

Properly installed replacement windows form a tight seal to reduce cold drafts and hot spots.

Safety & Security

Impact-resistant glass, up-to-date locks and security sensors provide additional peace of mind.

Raise Home Value

New windows can help add equity to your home and are valuable to potential buyers.

Curb Appeal

Replacement windows can update the beauty of your home – inside and out.

Reduce Noise

Insulating frames and triple-pane glass can help block out noises that bother you.

Less Maintenance

Replacement windows offer long-lasting durability and are easy to care for.

Reduce Dust & Allergens

Most modern windows are sturdy and will keep allergens out. A higher-quality frame will do more to stop air leaks and resist wear and tear.

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Replacement Windows

Frequently Asked Questions

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Pella’s proprietary fiberglass is the strongest material for windows, engineered for lasting durability. There are many factors that affect the actual long-term performance, appearance and functionality of fiberglass windows, but Pella's fiberglass windows are designed for a lifetime of everyday use. Yes, Pella's fiberglass window frames have virtually no expansion and contraction to help improve energy efficiency, reduce the risk for seal failure and provide long-term stability for dependable operation. In addition to the material of the window frame, glass types and coatings also affect the energy efficiency of a window. It depends what benefits are most important to you. Pella's fiberglass is the strongest material for windows, offering a low-maintenance and durable finish. If you're after a window that's tested to extremes, Pella's fiberglass windows are the way to go. Vinyl windows are easy to care for, energy efficient and budget friendly. Pella’s unique vinyl formula is performance-tested for excellent weathering, durability and color retention.
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Why Choose Us ?

Since opening our doors in 1994, Siding Unlimited, has been on a mission to provide our customers in both Milwaukee and Madison Wisconsin with the home improvement products and services they need for their homes.

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1
Quality Employees

Our team members love what they do and it shows in the excellence of their work.

2
Customer Service

Our top priority is customer satisfaction, and that requires an unwavering commitment to honesty and integrity.

3
Premium Products

Our products are beautiful, durable, low maintenance and engineered for exceptional performance.

4
Expert Installation

Our experienced team of technicians is passionate about precision. We always do things right the first time.

Trusted by the best in the business!

Experts You Can Count On

Trusted by some of the biggest names in the business.

With decades of experience in the industry and thousands of projects under our belts, we’ve earned our reputation for excellence by always delivering on our promises. That means no compromises, no shortcuts, and no excuses.

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Platinum Pella® Certified Contractor
There's never been a better time to improve your home.
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