The New Code of Practice for Fire Detection and Fire Alarm Systems is Now in Force

The updated BS5839-1:2025 standard for fire detection and fire alarm systems in non-domestic premises was published on 29th April 2025 and is effective immediately.

At Diamond Systems, we pride ourselves on not only staying ahead of industry changes — but also understanding what they really mean for our clients. Here’s a closer look at what’s changed and our take on why it matters.

The Key Changes at a Glance:

🔸 Risk-Based Design Takes Centre Stage
The objective of an L2 system where there is a sleeping risk has been further clarified.

🔸 Higher Standards for Installation
New siting rules for detectors and stricter expectations around functional earthing emphasise precision and resilience in installation quality.

🔸 Stronger Focus on Maintenance and System Lifespan
The updated standard tightens the rules around service intervals, redundant device management, and remote maintenance options — with cybersecurity now firmly in focus.

🔸 Greater Scrutiny of Alarm Transmission
Alarm transmission must now meet tougher performance, resilience, and cyber safety requirements.

Our Take on the Changes

At Diamond Systems, we believe BS 5839-1:2025 is more than just an update — it’s a shift in mindset across the industry.

1. Designs Must Be Truly Risk-Based

The change:
L2 system requirements now stress protection of both escape routes and high-risk areas.

Our view:
This demands deeper fire strategy knowledge. Designers can’t just apply boilerplate layouts anymore — systems must align with each building’s specific risks and evacuation plans. It’s a major step toward smarter, safer designs.

2. Quality of Installation is Under the Spotlight

The change:
Stricter rules on siting detectors, avoiding obstructions, and ensuring correct earthing.

Our view:
The industry is finally tackling poor workmanship. Installers need to think like designers, not just box-fitters. Expect more scrutiny on every cable, detector, and termination.

3. Maintenance is No Longer a Ticking Exercise

The change:
Clearer guidance on servicing, managing redundant devices, and enabling remote inspections securely.

Our view:
Compliance is now about continuous evidence, not just a sticker on the panel. Clients will need trusted partners who can offer full lifecycle compliance and cybersecurity resilience — not just annual testing.

4. Alarm Transmission Must Be Rock-Solid

The change:
Tougher requirements for how alarm signals are monitored, transmitted, and secured.

Our view:
Gone are the days of “plug and pray” diallers. The standard recognises that alarm transmission is mission-critical and must be treated with the same engineering rigour as the fire system itself.

Why Diamond Systems is Ready

Diamond Systems offers a full Fire Alarm Design and Design Verification Service, delivered by a team holding FireQual Level 6 certification and backed by decades of real-world expertise.

Whether you are designing a new system, upgrading an existing one, or verifying third-party work, we ensure full compliance with BS 5839-1:2025 — without compromise.

We don’t just “install to spec.” We design for risk, for resilience, and for real-world protection.

Join Us for Our BS5839-1:2025 Breakfast Briefing

🗓️ Date: Tuesday 17th June 2025 
📍 Location: Lisburn

Learn more about the changes, what they mean for your fire alarm designs, and how to stay compliant in the new era of fire safety.

Spaces are limited and pre-registration is required. To register your interest in attending, simply email info@diamondsystems.co.uk and we will be in touch to confirm your booking.

Let Diamond Systems help you stay safe, compliant, and ahead of the curve.