How much does it cost to fire harden my existing home?

 That will vary depending on the age of the home, the code it was built under, and the level of maintenance that has been done over the years.  CALFire has developed a Retrofit Guide:  Home Hardening – Low Cost Retrofit List: http://www.readyforwildfire.org/wp-content/uploads/Low-cost-Retrofit-List-Final.pdf