As a general rule, if the owner hired whoever drafted the construction plans, or if whoever drafted the faulty plans is an employee or agent of the owner, it is the owner who will be liable for defective plans.
In California, you need a contractor license to do any work that costs more than $500. The easiest kind of contractor's license is a Class “B” Contractor's License. This license allows you to do general contracting work.
How to Get a California Contractor License Who Issues Contractor Licenses in California? Determine the Type of Contractor License You Need. Access California Contractor License Application Forms. Fulfill Requirements and Obtain Required Documents. Submit Your California Contractor License Application. Pass Your Examination.
Be 18 or older with a valid Social Security number or individual taxpayer identification number. Have had four years of qualifying experience (journey-level, foreman, supervisor or contractor) within the past 10 years. Pass a two-part exam through the California Contractors State Licensing Board (CSLB).