Any new tenancy that begins on or after 01 October, landlords must ensure there is a proper working smoke alarm on each floor that has living accommodation. Landlord must also ensure for all new and existing tenancies, there is a proper working carbon monoxide alarm for any room that has a fixed combustible appliance (excluding gas cookers). If a tenant reports a faulty alarm, the landlord is required to investigate and repair or replace the alarm if required. Please see here for the updated regulations. Please see here for the latest guidance.