Can an owner do their own work?

Homeowners are allowed to do all of their own construction if the work site is a single-family, owner-occupied, detached residence.  Homeowners are held to the same standard of work as licnesed contractors.  The same permits are required regardless of who is doing the work.  If the residence is a multiple-family dwelling or owned with the intent ot sell, all work must be conducted by licensed contractors.  Under no circumstances are unlicensed contractors allowed to do any residential construction.  All commercial construction must be done by licensed electricians and plumbers.