You can get sprinkler systems for houses. They are quite expensive though, you need a large water source and a backup power supply.
Most houses actually survive the initial fire, they burn down later from embers in the gutters igniting the roof timbers or large burning plants that are touching the house that eventually burn through the cladding and ignite the frame. Sprinkler systems (usually misting) can help to prevent this.
Fires are actually quite rare, a particular house may only experience one every 50 years or so in fire prone areas, different areas burn each year. So a sprinkler system may not make much economic sense. Good insurance is much cheaper.
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