As the seller of a property at a minimum you should have the following complete prior to transfer of property:
At least one smoke alarm at each level/story located outside the bedrooms is required. The CCFD recommends one smoke alarm each level/story, one every bedroom, and interconnected so when one alarms they all sound an alarm.
Carbon monoxide detectors are required in every home which uses gas appliances (ie: heater, water heater, dryer, etc.) and should be located outside sleeping areas. Check with the building department of your city to verify exact requirements.
Chimney’s that can burn solid fuel shall be equipped with spark arrestors.