According to the Department of Consumer Affairs, if you don't charge more than $200 you don't need a license. Plumbing and electrical is a different story. You'll have to check on plumbing, but according to the Code Section 27-3017, ALL electrical work needs to be done by, or under, a licensed master electrician.
The exception is low voltage work. Answer: If you are going to do normal repairs that involve repairing and replacing existing fixtures and switches etc., then no license is required, as long as you DO NOT go into or interfere with the trap in plumbing or the fuses in electrical. If you are doing it as a business or for money then you should check with the city if you need a contractors license.
Furthermore you would need insurance. Maintenance repairs are excluded from the Codes as long as they are maintenance only and not NEW. More.
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