What happens if I don get a permit / inspection for my new bathroom?
Again in California, at the time of sale you must disclose anything done without a permit. The buyer may find this acceptable and make their offer accordingly, however in some cases the lender will not count the unpermitted bathroom as a bath, or part of their square footage calculations in their appraisal and that could significantly affect how much they can loan someone to buy your house, and ultimately result in killing the sale. At this point you may have to discount your price to the buyer to compensate them for fixing any issues to make the appraisal work, or get the work permitted before a lender can make a loan. YMMV.