Granite Bay cost of living score 139.3 More expensive 39.3% higher than the US average 7.1% lower than the California average Granite Bay, California gets a BestPlaces Cost of Living score of 139.3, which means the total cost of housing, food, childcare, transportation, healthcare, taxes, and other necessities is 39.3% higher than the U.S. average and 7.1% higher than the average for California.