The median home price in California is $785,000, above the national median of $420,000. With a median household income of $84,900, the price-to-income ratio is 9.2x.
Property taxes in California average 0.75% of assessed value. On the median home, that is $5,888 per year, or $491 per month added to your mortgage payment.
California has a state income tax of 1%–13.3%. Factor this into your take-home pay when calculating how much mortgage you can afford.
The cost of living index in California is 142 (national average = 100). Expect to pay more for groceries, transportation, and healthcare in addition to housing.