[quote=Hobie]Does SDG&E or anyone have a website that publishes average electric/gas costs by zip code? Would be handy.[/quote]
Average doesn’t mean very much for individual experiences. Every home is different. SDG&E does publish price her kWh though. It really depends on whether you have a pool, what kind of light bulbs you have, how many lights you turn on at one time, how many hours a day is there people in the house, is there an A/C, how old are the appliances, which direction isthe house facing (wind factor), etc. All if those things can greatly vary ones electricity bill. I know someone who live in a 3800 sq-ft house and only spend $30-$40/month in electricity. Then there are people on the other extreme who spend $200/month in a 2 bed apartment.
Regarding the OP, you pretty much have your general bases covered. You can also add in 1-2% for maintenance but I assume you’re not completely stretched and will be able to have more than that saved a month, so you can just tap into your savings when problem occurs.