A Certificate of Compliance (COC) is required for most plumbing work where the total value of the work, including materials, labor, and VAT, exceeds R1500.00. It is also required, regardless of cost, with the installation, repair, or replacement of Electric Water Heating Systems, Hot Water Solar Water Heating Systems, Heat Pump Water Heating Systems; and the construction, installation, or alteration of any above or below-ground sanitary drain.