If you need a referral for an outside inspector contact me offline. I'm also in the 94539 area code, you could also email some photos that I could forward to my inspector for comment....
Steven A. Ornellas, GRI, ABR, e-PRO, CMPS, RE Masters, MBA
REALTORÂ® / Mortgage Banker-Broker / Certified Mortgage Planning Specialist
Steven Anthony Real Estate & Financial Services
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Perhaps you can negotiate right now that if the crack(s) reach a certain given width the Builder will re-pour the garage floor - worth a try .... You might want to call a cement contractor to determine what would be considered as an above-normal width that would justify pouring a new garage floor.
Your best action is to hire a structural engineer or a civil engineer/soil engineer. If the soil was not prepared(not enough compaction) for the weight of the house you will see these cracks. There are other reason for the crack but I would bring in an export. You should have one year warrenty and they should take care of it.
Prudential California Realty