Hallway NEC Codes
At least one receptacle if hallway is 10 feet or longer.
Carbon Monoxide sensors required on wall outside all sleeping quarters. This would include a guest bedroom located in another location.
Disclaimer: These codes are based on the NEC (National Electrical Code) 2023 edition and are provided for general reference. Local jurisdictions may have additional requirements. Always consult a licensed electrician and your local building department.