When building or improving one-family or two-family residences on such property for the occupancy or use of such owners and not offered for sale or lease, or building or improving commercial buildings, at a cost not to exceed $500 on such property for the occupancy or use of such owners and not offered for sale or lease, such owners of the property may act as their own contractor and they must provide full time, direct on site supervision themselves of all work not performed by licensed contractors.
As the owner of a one or two family dwelling you my act as your own contractor and do the work yourself, provided that the home is for your own use, it is not for sale or lease. You must also be doing the work yourself or providing direct on site supervision. If you are the owner of a commercial property (Other than one- & two-family dwellings) you are required to hire a contractor for any work that requires a permit and inspection.