01
Smoke alarms, every level and every bedroom
The first purchase in home protection, because fire is the fastest hazard a house produces and the one that gives the least warning. The fire that matters most starts while everyone is asleep, and the alarm is what converts smoke into time. Cover every level and every sleeping area, and consider sealed ten-year battery models that end the battery argument entirely. The alarm on the counter with its battery removed is the most common failure, and it is a choice, not an accident.