A plumbing contractor is a licensed and trained professional who specializes in the installation, repair, and maintenance of plumbing systems in residential, commercial, and industrial buildings. They may work on projects such as installing new plumbing systems in a building, repairing leaks or blockages in pipes, or performing routine maintenance on plumbing systems. They may also be involved in the design and planning of plumbing systems for new construction projects. Plumbing contractors typically have a wide range of knowledge and skills related to plumbing, including knowledge of local building codes and regulations, and they use a variety of tools and equipment to perform their work.