Replacement Windows & Installation in Janesville, WI
Local Window Installation Experts Serving Southern Wisconsin
At Bob’s Custom Windows & Siding, window replacement is about more than new glass—it’s about elevating your space. As a trusted window installer in Southern Wisconsin, our team helps you select the right windows to increase natural light, improve energy efficiency, and meet local building codes, all while delivering long-lasting performance.
We provide full-service window replacement and installation in South Central Wisconsin and Northern Illinois. With deep knowledge of the region’s climate and building requirements, we ensure every window is properly fitted for energy efficiency, smooth function, and beautiful appearance. Contact Bob’s Custom Windows & Siding today for a free estimate.
Replacement Window Styles for Your Janesville Home
Your Local Window Contractor in Janesville, WI
At Bob’s Custom Windows and Siding, quality products and workmanship does make the difference. Putting our customers first is our number one priority! Bob’s Custom Windows and Siding, Inc. is located at 1015 North Parker Drive in Janesville, Wisconsin. Because our showroom features examples of our window and siding lines, you can see and feel the quality of our products.
Bob’s Custom Windows and Siding has an affiliation with Advanced Construction of Janesville LLC. By collaborating and working closely with Advanced Construction of Janesville, we can offer our customers more than just windows and siding. In other words, we can now offer both residential and commercial construction, including remodeling, roofing, excavating, egress windows, and more.
Truly Insulated Mainframe
Two chambers filled with the same insulation found in high-end coolers
Offers seven times better R-Values than hollow-frame vinyl windows
Insulates twice as well as competitive foam-filled frames
Aesthetic Engineering
Designed to match the beauty and elegance of wood windows
Narrowline, dedicated extrusions adds beauty without sacrificing strength
Coved, mitered interior glazing beads add styling and additional security
Climate-Specific Performance
ENERGY STAR® qualified for all climate zones
Some of the lowest U-Factor and SHGC numbers available in the market
Secure, long-lasting seal, with edge deletion, provides superior performance that’s guaranteed to last a lifetime
Secure Sash Structure
Low-profile French cam locks routed into the frame
Locks fastened through three layers of .075 iUPVC
Scores 10 out of 10 on AAMA forced entry test
Airtight Construction
Fusion-welded with no weep holes
Triple weather stripping at every point of contact
Dedicated extrusions and step jambs
One of the lowest published air leakage rates available in the marketplace
Superior Functionality
Self-tensioning block-and-tackle balance system; same system used by the higher-cost, name brands
Engineered to last four times as long as competitive systems
Locking pin and shoe ensures easy, secure tilt-ins for simple cleaning
Coordinated recessed night latches extend out from the frame to allow ventilation
Up To 27% More Viewing Area
27% Greater visible viewing area than traditional vinyl windows
Mulled with one of the narrowest systems available to maximize viewing area
Precision Frame Fabrication
Fully fusion-welded frames and sashes provide stronger, more airtight windows than mechanically fastened competitive products
Complete closed frame system keeps water from entering the mainframe, eliminating the need for unsightly weep holes
Made from iUPVC, a high-tech, synthetic polymer that offers significantly better energy efficiency than wood or metal windows
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Replacement Window FAQs for Southern Wisconsin Homeowners
Thinking about replacing the windows in your home? Whether you’re dealing with cold drafts, rising energy bills, outdated windows, or simply want to improve your home’s appearance, it’s important to know your options.
At Bob’s Custom Windows & Siding, we’ve helped Southern Wisconsin homeowners with replacement windows for more than 40 years. Below, we answer some of the most common questions about window replacement, energy efficiency, installation, and choosing the right windows for Wisconsin’s changing seasons.
Bob’s Custom Windows & Siding provides professional replacement window installation in Janesville and throughout Southern Wisconsin, including Rock, Dane, Walworth, and Green counties. With more than 40 years of experience, Bob’s helps homeowners choose and install quality replacement windows designed for comfort, energy efficiency, and lasting performance. Homeowners can also visit our Janesville showroom to explore window options in person.
The best replacement windows for Wisconsin winters combine energy-efficient glass, insulated frames, tight weather seals, and professional installation. Look for windows with a low U-factor and ENERGY STAR certification appropriate for Wisconsin’s Northern climate zone. Bob’s installs Sunrise Windows featuring insulated frames and advanced weather-stripping to help reduce drafts and improve indoor comfort during cold Wisconsin winters.
The cost of replacement windows in Janesville depends on the window size, style, materials, glass options, installation requirements, and number of windows being replaced. Custom shapes and larger windows may cost more than standard styles. Bob’s Custom Windows & Siding offers free estimates to help Southern Wisconsin homeowners understand their options and get accurate pricing for their specific project.
Yes. Sunrise offers energy-efficient replacement windows with insulated frames, advanced weather-stripping, and high-performance glass options. Bob’s offers Sunrise window products that meet ENERGY STAR requirements for the Northern climate zone. Energy performance varies by window model and configuration, so it’s important to compare U-factor, solar heat gain coefficient, and air leakage ratings when choosing windows.
Working with a local window replacement company gives homeowners the opportunity to work with people who understand regional weather, common home styles, and local installation needs. Bob’s Custom Windows & Siding has served Southern Wisconsin for more than 40 years and operates a showroom in Janesville. Our focus is on quality products, experienced installation, straightforward service, and helping homeowners make informed decisions about their homes.
Common signs that your windows may need replacing include cold drafts, condensation between glass panes, difficulty opening or closing them, damaged frames, and noticeable temperature differences near windows. Older windows may also contribute to higher heating and cooling costs. If you’re experiencing these problems, Bob’s can help you evaluate replacement window options for your Southern Wisconsin home.
Replacing older, inefficient windows with properly installed, energy-efficient models can help reduce heat loss in winter and heat gain in summer. This may lower heating and cooling costs while making your home more comfortable. Actual savings depend on your existing windows, insulation, home construction, and energy usage. Bob’s offers energy-efficient Sunrise Windows designed to perform in Wisconsin’s changing climate.
You don’t necessarily need to replace every window at once. Some homeowners replace all their windows during one project, while others prioritize the rooms with the worst drafts, damaged windows, or comfort problems. Replacing multiple windows together may offer installation efficiencies, but a phased approach can make budgeting easier. Bob’s can help you evaluate your home’s needs and plan a replacement project that fits your priorities.
Bob’s Custom Windows & Siding offers a variety of replacement window styles, including double-hung, casement, sliding, picture, bay, bow, and specialty-shaped windows. Each style offers different advantages for ventilation, natural light, appearance, and ease of use. Our team can help you compare options and select windows that complement your home’s architecture and meet your everyday needs.
Yes, replacement windows can often be installed during Wisconsin’s winter months, depending on weather conditions and the installation requirements. Professional installers work to limit the amount of time each window opening is exposed to outdoor temperatures. Severe cold, snow, ice, or high winds may affect scheduling. Contact Bob’s to discuss installation timing and availability for your project.