Low pressure gas systems (2 psi or less) with more than 10 gas outlets require plan check. Medium and high pressure gas systems (more than 2 psi) require plan check regardless of the number of gas outlets.

Plan check is not required for a 2-inch or less water service when the potable water piping is sized using table 610.4 of the Los Angeles Plumbing Code.

Plan check for sewer piping is not required when the drainage fixture units do not exceed 216 fixture units and pumps are not used.