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