When planning to build a new home or Accessory Dwelling Unit (ADU) in San Jose, one of the most essential—yet often underestimated—components is the plumbing system. Plumbing plays a crucial role in ensuring a safe, comfortable, and code-compliant living space. From basic water supply lines to complex waste disposal systems, plumbing is integral to modern living. And in a high-cost region like the Bay Area, understanding how plumbing fits into your total construction budget i