Which of the following is considered a significant repair requiring a permit under the UPC?

Relocating an entire plumbing system is considered a significant repair requiring a permit under the Uniform Plumbing Code (UPC) because it involves major alterations to the plumbing infrastructure within a building. This type of work typically affects multiple aspects of the plumbing system, including supply lines, drainage, and venting, necessitating careful planning and compliance with code regulations to ensure safety and functionality.

Significant repairs like relocation often require building permits to ensure that inspections can occur and that the work is up to code standards. This process helps maintain the integrity of the plumbing system, ensures proper connections and drainage, and helps avoid potential safety hazards.

In contrast, activities such as replacing a faucet cartridge, fixing a leaky pipe, or clearing a blocked drain are generally considered minor repairs. These tasks do not typically require permits because they do not involve significant changes to the overall plumbing system or its layout. Instead, they can usually be performed within the existing framework of the plumbing system without the need for extensive oversight.