In California incorporation offers little liability protection for the small guy.
California does not permit LLC as a legal form for contractors.
If you need to protect your assets from lawsuits the only viable method is to purchase insurance. When properly insured, a small operator's assets are rendered too small to pursue. Attorneys sue to get buckets of cash from insurance carriers. They don't normally waste their time trying to seize 'business assets' that are commonly just the tools of a man for hire. Any cash or credit the tradesman ever had will have been spent defending himself against the suit.
For the small shop even the tax advantages are choked down to nothing. When you back out the extra paperwork, extra layers of taxation,legal expenses, meeting rituals -- without documented meetings your corporation dies at trial -- corporate form just does not pay off.
This changes when a contractor gets big enough to have juicy liquid assets and runs his operation from an office. At that point, incorporation may have merit.
Unmentioned, but very common, is an incorporation designed to pass the company on to the next generation. This is by far the best reason to incorporate. It is in this way -- in almost all jurisdictions -- that a founder can stage the transfer of ownership without paying killer taxes all at once. It also permits the heirs to get a contractors license in their own names ( in California )by just being active in the management of the corporation over a period of five years, IIRC. No test, no time in the trade. The kid could be going to college.