Smoke and Carbon Monoxide Alarm Rules for Rented Homes
Domestic detection has its own legal framework, separate from the commercial fire alarm systems most engineers design. In rented homes in England, landlords must provide smoke alarms and carbon monoxide alarms and keep them working — duties that were extended in 2022. For an engineer working in the residential sector, or fielding questions from clients who are landlords, knowing the essentials is useful, even though these are domestic duties rather than BS 5839-1 system work. This guide gives an orientation.
The central point is that landlords must provide and maintain smoke and carbon monoxide alarms in rented homes, with duties extended in 2022 — domestic duties distinct from commercial fire alarm systems.
Who this is for
This is for fire and security engineers who encounter domestic detection or landlord questions in the residential sector. The experience level assumed is competent engineer. Use this as orientation; the duties rest with the landlord, and the authoritative source is the regulations and the accompanying guidance. Domestic detection follows BS 5839-6 where applicable, not the commercial BS 5839-1.
What the rules require
In England, regulations require landlords to provide smoke alarms and carbon monoxide alarms in rented homes. Broadly, a smoke alarm is required on each storey with a room used as living accommodation, and a carbon monoxide alarm in any room used as living accommodation that contains a fixed combustion appliance other than a gas cooker. Landlords must also ensure the alarms are in working order at the start of a tenancy. These are practical, dwelling-level duties rather than system-design requirements. The authoritative source is the regulations and the accompanying guidance, which should be consulted directly for the detail rather than a summary.
The 2022 changes
The duties were strengthened from 1 October 2022. Amendment regulations extended them — notably requiring a carbon monoxide alarm in rooms with fixed combustion appliances such as gas or oil boilers and solid-fuel appliances, broadening what had previously been a narrower requirement, and extending the requirements to include social housing, which the earlier 2015 regulations had not covered in the same way. In effect, more homes and more rooms came within scope. The precise scope and duties come from the amended regulations, which should be consulted directly. For anyone advising landlords, the headline is simply that the CO alarm duty widened and social housing was brought in.
Domestic, not commercial
It is important to keep these rules in their proper box. They are duties on landlords for domestic dwellings, using domestic smoke and carbon monoxide alarms, rather than the commercial BS 5839-1 systems most fire alarm engineers design and maintain. They overlap the domestic detection world, including BS 5839-6, which is the code of practice for fire detection in dwellings. From field experience, confusion arises when the commercial standard is assumed to apply to a dwelling, or vice versa. The duties rest with the landlord; the domestic alarm arrangements follow the relevant guidance and BS 5839-6 where applicable. Knowing which world you are in — domestic dwelling or commercial premises — is the first thing to get right.
The engineer's understanding
For an engineer, the value is context and clarity. Understand that landlords must provide and maintain smoke and CO alarms in rented homes, that the 2022 changes extended the CO alarm duties and brought in social housing, and that these are domestic duties distinct from commercial fire alarm systems. Where you do domestic detection work, follow BS 5839-6 and the relevant guidance rather than assuming the commercial standard applies. Verify specifics against the regulations, and be able to point a landlord client to the authoritative sources for their duties. Being clear about the boundary between domestic and commercial detection keeps advice accurate and within remit.
Common points to check
For engineers, the practical points are recognising these as domestic landlord duties, applying BS 5839-6 for dwelling detection rather than the commercial standard, and directing landlords to the regulations for their duties. Confirming the right standard for the right setting is the essential check.
When not to rely on this alone
When not to use this article: do not treat it as a statement of a landlord's specific legal duties. Those come from the regulations and the guidance, applied by the landlord; where duties are in question, appropriate advice should be taken.
Relevant standards
Domestic detection follows BS 5839-6, a code of practice for dwellings; the landlord duties arise under the smoke and carbon monoxide alarm regulations for rented homes. Commercial systems follow BS 5839-1. Separate the domestic duties from the commercial standard, verify specifics against the regulations, and always work to current editions and guidance.
Professional disclaimer
This is an educational and workflow resource for competent engineers and does not replace the regulations, the current British Standards, legal advice, or competent judgement. It is orientation only; verify specific duties against the authoritative sources.
Related documentation
Use this with the smoke and carbon monoxide alarm regulations, the GOV.UK guidance and BS 5839-6 for dwellings. Apply the domestic standard for dwellings, and direct landlords to the regulations for their duties.