Will an insurance company insure our home if there is a unpermitted cottage?

I’m in the process of buying a foreclosure home (Saratoga,CA, can’t transfer the insurance since it has already lapsed) that has a detached unpermitted cottage (2 bedrooms, kitchen, bathroom and living room total of 900 sq ft), the main home also has a unpermitted converted garage that is used as a in law quarter (separate [...]