I'm not sure what the California codes say, but here, single family homes require no fire detection systems, nor sprinklers. I have wireless interconnected smoke detectors in my house which are connected via a relay output to my security system. Others use all wireless or wired proprietary detectors, like Honeywell for example, connected to the panel. If you don't want to use the panel for security, you could just run a single zone for fire, always armed, and have it dial out immediately. Most of the home system I know of (admittedly limited to only a couple manufacturers) are UL listed for residential fire.
Other things to consider: carbon monoxide and combustible gas detection. They can be run on other zones for life safety purposes, as well.
And if you do end up doing it, be careful what you do in/around the kitchen. Standard smokes will go off due to burnt toast or oil smoking in the pan. You don't want trucks rolling every time someone wants to fry bacon. I prefer heat detectors, but others swear by ionization detectors. I tend to just not want smoke detection in the kitchen, period.