2009 California Labor Code - Section 3800 :: Article 4. Construction Permit

3800.  (a) Every county or city which requires the issuance of a
permit as a condition precedent to the construction, alteration,
improvement, demolition, or repair of any building or structure shall
require that each applicant for the permit sign a declaration under
penalty of perjury verifying workers' compensation coverage or
exemption from coverage, as required by Section 19825 of the Health
and Safety Code.
   (b) At the time of permit issuance, contractors shall show their
valid workers' compensation insurance certificate, or the city or
county may verify the workers' compensation coverage by electronic
means.