Technical Booklet E Amendment 9 came into effect on 6 May 2025, significantly expanding fire detection requirements for new build domestic properties in Northern Ireland. As the market leader in domestic fire and carbon monoxide (CO) alarms across Northern Ireland, Aico has been helping installers, specifiers, and social landlords navigate exactly these kinds of regulatory changes for over a decade. If your work involves a building regulations application submitted after 6 May 2025, this affects you, and it may affect more projects than you might expect. For social landlords, it includes any planned works programme where building control is involved, and the compliance obligation sits with the organisation, not the contractor.
What Has Changed?
Previously, smoke alarms were required in circulation spaces that form part of an escape route and the principal habitable room only. Amendment 9 extends coverage to every habitable room – every bedroom, living room, dining room, study, and lounge. All alarms must be mains-powered with a battery back-up and fully interconnected throughout the dwelling.
In a typical three or four bedroom home, this means approximately double the number of alarms compared to pre-May 2025 installations. For residents, that means substantially better protection. For landlords, it means a demonstrably higher standard of care and a stronger position when compliance is scrutinised. It is also worth noting that the amendment applies to materially altered dwellings, not just new builds – a rewire, kitchen extension, or loft conversion with a building regulations application dated after 6 May 2025 could bring an existing property into scope.
Managing False Alarm Risk
More alarms mean greater exposure to nuisance activations – Amendment 9 itself acknowledges this, noting that multi-sensor alarms can significantly reduce unwanted false alarms in certain circumstances. Aico’s Ei3024 and Ei3030 multi-sensor alarms combine optical smoke and heat sensing with enhanced technology to distinguish genuine fires from sources such as steam or dust, without compromising detection performance. The Ei1529RC Hard Wired Alarm Control Switch, installed at a convenient point in the property, allows occupants to locate, silence, and test the full system from a single point. Neither is a regulatory requirement, but both represent best practice. For social landlords managing large portfolios, nuisance activations generate unnecessary callouts and complaints, both of which multi-sensor technology and the Ei1529RC help to reduce.
Are Your Installers Ready?
Amendment 9 raises the bar for installation. More alarms, more coverage, and fully interconnected systems mean correct siting, cabling, and commissioning are more important than ever. In
retrofit scenarios where chasing cables is not practical, wireless interconnection provides a straightforward path to compliance, which is why understanding the full range of system options before work begins has never been more important. Aico has trained tens of thousands of installers across the UK through its free, FIA CPD-accredited Expert Installer scheme. In April 2026, for the first time in Northern Ireland, Aico will deliver the City & Guilds-assured course in domestic fire and CO alarm systems – a recognised benchmark of quality and the most comprehensive installer training Aico has ever offered. Getting this right from first fix protects residents, supports compliance, and avoids costly remediation later.
If you are a social landlord with planned works in the pipeline and want to understand how Amendment 9 applies to your programme, get in touch with Duncan Orr at duncan.orr@aico.co.uk
This blog should be read alongside the full Technical Booklet E and Amendment 9 documentation available from the Department of Finance Northern Ireland.