“John Zellmer is a man with old world craftsmanship skills. He is the only one we call for replacement windows and doors.” – Ralph and Carol Luedtke, Cedarburg, WI


“We particularly appreciate John’s attention to detail. He is able to problem solve at the job site. He gives opinions and listens to our wishes. He and his crew do quality work. He is pleasant and easy to work with.” – Jim and Jacquie Branchford, Colgate, WI


“Custom View Windows is spectacular! From workmanship, to follow up, to service, they deliver in a first class way. It is a delight to have them work on my home.” -Suzie Mackie Grafton, WI