CO alarms: which rooms really need them?

Carbon monoxide alarms are required where the unit has fuel-burning appliances or an attached garage — but the placement details trip up a lot of teams. Sleeping areas, each level, near the appliance itself? Post your building type and what your inspector required, so we can build a picture of how the standard is being applied.

CO placement questions multiply because buildings vary: a gas water heater in a basement closet, a boiler room under the units, an attached garage sharing a wall — each setup reads a little differently, and local rules layer on top of the standard. The pattern that keeps you safe is placing protection near sleeping areas and the fuel-burning sources, then letting the inspector find more protection than required rather than less. Post your setup — fuel-burning appliances, attached garage, both, or neither — and tell us where your inspector required CO alarms?