Who is allowed to do plumbing on a commercial property in California? Is just anyone allowed to plumb on a commercial property in CA? For example: the maintenance man? Does the maintenance man need a plumbing license? Please, if anyone knows. Well, I have your answer right here. Most plumbing laws are in effect where only a master plumber or his licensed employees can work on a job until it has a final inspection by the plumbing authority for that area. After that the owner can do any thing he wants BUT being a build with other residents other then the owner ? Call the city plumbing inspector, Id ask
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