In general, per the Uniform Building Code, any kitchen that is used to prepare food that is not served immediately and on premises must be to current local health codes. However, all part of the building that access the kitchen directly must meet those codes, not just the kitchen. That is a UBC code, and to my knowledge, all states use that code. However, California, and I believe a few other states allow for certain uses of home kitchens and over ride that sections of the UBC. If you must leave the kitchen structure to access the rest of the house, then you can use that kitchen.
But, it always comes down to the local County Health Department. Thus, Bryan was correct.
Whip It Off, Chambers!
"perhaps...but then again...maybe not..."