The Smoke and Carbon Monoxide Alarm (England) Regulations 2015
As of 1st October 2015 it has been a legal requirement for landlords to provide smoke detectors in all properties that are privately rented out, and carbon monoxide detectors where necessary.
At least one smoke detector must be installed for each storey of the building that is used wholly or partly as living accommodation, including loft conversions and bathrooms on a separate floor. Mezzanine levels and floors with just an entrance hall or storage rooms are exempt.
The landlord is responsible for ensuring that every smoke detector is in working order at the start of each tenancy, and tenants should periodically check that the detectors are still operational.
Carbon monoxide detectors are legally required in rooms containing a solid fuel burning appliance, although as gas and liquid fuel appliances can also emit carbon monoxide, it is recommended that carbon monoxide detectors are installed in these instances too.
Failure to comply with these regulations can result in a penalty to the landlord of up to £5,000.