For over six decades, the Joseph Frederick & Sons name has meant the best in residential and commercial plumbing, heating and air conditioning systems. Our licensed and registered electricians and plumbers are known for their quality work and for their personal touch.Joseph Frederick & Sons has designed and installed hundreds of residential and commercial systems and provides maintenance and service for many more. We ensure the finest year-round system operation available today.Joseph Frederick & Sons continues a family tradition built on three generations of quality products, quality workmanship, integrity and service to the homes and businesses of northern Delaware.Joseph Frederick & Sons has also added bathroom and kitchen to our line of services. Our designer has more then 20 years of experience. As with all of our services you expect high quality craftsmanship.