In every room and the hallways, there will be a Nest Protect smoke detector system. All of them will be grid connected, and interconnected. This means that as long as the house has electricity, the smoke detectors will work. In addition, if one smoke detector goes off, then all of them will sound.
In addition, every room and hallway will have a residential fire sprinkler system. When the fire becomes strong enough, the sprinklers will activate and either extinguish the fire or contain it. This will reduce insurance costs, and save the house from total damage if there was a fire.