5 Coverage Gaps Costing UK Operators Six Figures

Industrial premises now account for 25% of all UK workplace fires the single biggest sector, ahead of food and drink, retail, and offices. Of the 6,665 workplace fires recorded in 2024/25 (per Home Office fire statistics), 1,656 happened in industrial premises. The number one identifiable cause across all workplace fires was electrical distribution faults, responsible for approximately 18% of incidents.

After auditing warehouses and industrial premises across Blackburn, Preston, Bolton, and Lancaster for over 40 years, the pattern is consistent. Most operations have at least three warehouse fire alarm coverage gaps the team doesn’t know about. When a fire happens, those gaps are what get insurance claims refused or partially paid.

This article walks through the five most common warehouse fire alarm coverage gaps, what they cost operators who don’t know about them, and what BS 5839-1:2025 (the British Standard updated in April 2025) now requires.

Why Warehouse Fire Alarm Compliance Just Got Stricter

On 30 April 2025, BS 5839-1:2025 replaced the 2017 edition as the governing standard for fire detection and alarm systems in non-domestic premises. The revision was developed by BSI’s FSH/12/1 technical committee with a focus on safety improvements following recent fatal fire incidents.

For warehouse operators, three changes matter most. First, the standard now requires design verification the original designer must witness commissioning to confirm the system performs as intended. Second, mandatory zone plans must be displayed on site. Third, fire-resistant red cabling is now required for mains supply to fire alarm systems. These aren’t optional refinements; they’re compliance baselines that insurers and inspectors will check against from your next system upgrade or audit.

At the same time, regulatory enforcement is intensifying. Fire safety prosecutions rose 79% in 2023/24, and 2,972 formal fire safety notices were issued in 2024/25 up 5.3% on the previous year. Only 58% of fire safety audits in England in 2024/25 were satisfactory. The combination of stricter standards, more enforcement, and falling pass rates means warehouse fire alarm coverage gaps that were tolerated five years ago are now actively penalised.

Gap 1: Mezzanine Blind Spots

Most warehouses with mezzanine floors have fire detection at the original ceiling height not at mezzanine level. Smoke and heat rise to the ceiling, where the detectors are. By the time enough product or activity exists on the mezzanine to trigger detection at ceiling height, the fire has already grown beyond control.

Mezzanines need their own dedicated detector array, designed to BS 5839-1:2025. The original design didn’t include it because the mezzanine didn’t exist at the time. This is one of the most common findings during post-fit-out audits: a warehouse adds a mezzanine for office space or extra storage, the build is signed off by building control, and the fire alarm system is never extended to cover it.

Under BS 5839-1:2025, any modification or extension to a fire alarm system now triggers documentation and recommissioning requirements. This means retrofit mezzanine detection isn’t just a technical add-on it needs to be designed by a competent person, installed under controlled conditions, and signed off with full documentation. The cost of doing it properly is small. The cost of being found non-compliant after a fire is the difference between an insurer paying out and refusing the claim entirely. A proper fire risk assessment will identify mezzanine gaps before they become a problem.

Gap 2: High-Bay Storage Dead Zones

Modern warehouse racking can reach 12 metres or higher. Smoke from a fire low in the racking takes time to reach ceiling-mounted detectors, and may dissipate horizontally through gaps between aisles before doing so. By the time a ceiling detector activates, the fire has often spread across multiple pallet positions turning what could have been a contained incident into a six-figure loss event. The average major fire costs a UK business £657,074, and 25% of businesses affected by a serious fire never reopen.

High-bay storage areas need either VESDA (Very Early Smoke Detection Apparatus) aspirating detection systems, or in-rack detection, or both. Standard ceiling detection is insufficient for storage above approximately 4 metres. Aspirating detection works by continuously sampling air through a network of pipes it can detect smoke at concentrations far lower than spot detectors, often providing 20–30 minutes of additional warning before a fire becomes visible. For high-value storage (electronics, pharmaceuticals, paper goods), the ROI on aspirating warehouse fire alarm coverage is typically realised in a single avoided incident.

Gap 3: Cold Storage Detection Failures

Standard fire detectors fail below 0°C. Cold storage warehouses, refrigerated sections, and freezer areas need detection systems specifically rated for low temperatures. Most don’t have them.

This is one of the easiest gaps to identify and one of the most consistently missed during system upgrades. A warehouse expands into chilled or frozen product storage, the cold rooms are commissioned and operational, and the original fire detection design which assumed ambient temperatures is never updated. When inspectors review the fire alarm zone plan against the actual building layout, the cold storage zones show ambient-rated detectors that haven’t worked reliably since the refrigeration plant was switched on.

If your operation includes any cold storage, refrigerated areas, or temperature-controlled rooms, your fire alarm system needs cold-rated detection in those specific areas. The fix is straightforward: zone-by-zone audit, identification of temperature-controlled spaces, replacement of detectors with cold-rated equivalents (typically heat detectors rated to –40°C). The audit cost is modest. The fire-without-detection cost is catastrophic.

Gap 4: Loading Bay Airflow

Loading bays have enormous airflow when doors are open. Trucks coming in and out create air currents that pull smoke out of the building before it reaches detectors. A fire near the loading bay can be effectively masked from the detection system for as long as the doors remain open which, in a busy warehouse, can be most of the working day.

Loading bays need either local detection sensitive to specific airflow conditions, or dedicated heat detection that doesn’t depend on smoke reaching a sensor. Combined with CCTV monitoring for early visual identification, this closes one of the most dangerous gaps in industrial coverage. The CCTV element matters because most loading bay fires start in dock-level activity (forklift faults, electrical equipment, packaging materials) where visual confirmation often precedes smoke reaching any detector.

The simplest practical fix: install heat detection along the loading bay ceiling, link CCTV cameras with fire detection AI analytics, and ensure the fire alarm zone plan flags loading bays as a known weak point. Inspectors don’t penalise warehouses for having difficult environments they penalise warehouses that fail to acknowledge and design around them.

Gap 5: System Age and Documentation

Insurers now actively check fire alarm system age and maintenance documentation when claims are made. A system over 10 years old without comprehensive service records is increasingly treated as a partial breach of “reasonable care” obligations under the Regulatory Reform (Fire Safety) Order 2005. Several major UK insurers including Zurich, AXA, and Aviva now include policy conditions described as “conditions precedent to liability,” which means a claim can be refused in full if maintenance documentation isn’t current and complete.

UK businesses make fire property insurance claims of approximately £940 million annually, with total losses exceeding £1 billion when uninsured losses are included. The single most preventable reason for a claim to be refused or reduced is missing documentation. This isn’t about whether the fire alarm worked it’s about whether you can prove it was maintained to industry standard at the time of the incident.

The fix is operational, not technical. Keep every service certificate. Our service and maintenance offering produces audit-ready documentation as standard: six-monthly servicing under BS 5839-1:2025, signed certificates, zone plans kept current, and digital records accessible on demand. When the insurer asks for documentation, you should be able to produce a complete history in under 90 seconds. Anything slower is operational risk waiting to crystallise.

What BS 5839-1:2025 Means for Your Warehouse Fire Alarm System

The 2025 standard introduced several changes that directly affect industrial premises. The five that matter most for warehouses:

• Design verification: Systems must now be designed by a competent person, and the designer should witness commissioning to confirm performance matches design intent.
• Mandatory zone plans: Up-to-date zone plans must be displayed on site and kept current with any building changes critical for warehouses where layouts evolve.
• Fire-resistant red cabling: Mains cabling for fire alarm systems must be red and fire-resistant, identifiable on inspection.
• Faster ARC signalling: Fire signals to an Alarm Receiving Centre must reach within 90 seconds; fault signals within 3 minutes.
• Extensions and modifications: A new dedicated section addresses how existing systems are extended or modified directly relevant when warehouses expand or reconfigure.

If your warehouse fire alarm system was designed and installed before April 2025, none of this is automatically retrospective existing systems don’t need to be ripped out. But any modification, extension, or system upgrade from that date onwards triggers the new standard. For warehouses planning racking changes, mezzanine builds, cold storage additions, or capacity expansions, the 2025 standard is now the reference point.

Frequently Asked Questions About Warehouse Fire Alarm Compliance

What does BS 5839-1:2025 require for warehouses?

BS 5839-1:2025 specifies appropriate detection categories based on building use, occupancy patterns, fire load, and storage type. For most warehouses, this means L2 or L3 detection with additional consideration for mezzanines, high-bay racking, and cold storage. Where storage exceeds approximately 4 metres or fire load is high, aspirating detection (VESDA) or in-rack detection is typically required.

How often should warehouse fire alarms be serviced?

BS 5839-1:2025 mandates servicing at least every six months by a competent engineer ideally BAFE-accredited. Quarterly servicing is increasingly recommended for high-risk industrial premises, particularly those with high-bay racking, cold storage, or significant electrical load.

Will insurance pay out if my warehouse fire alarm system is old?

Increasingly, no or only partially. Most UK commercial insurance policies now include clauses requiring fire safety systems to be “maintained to industry standard,” and several major insurers describe these clauses as “conditions precedent to liability.” An undocumented 10+ year old system may not meet that test, leading to refused or significantly reduced claims. The question isn’t the system’s age it’s whether you can produce documentation proving consistent maintenance.

What is VESDA and does my warehouse need it?

VESDA (Very Early Smoke Detection Apparatus) is an aspirating smoke detection system that continuously samples air through a network of pipes. It detects smoke at concentrations far lower than spot detectors. Warehouses with storage above 4 metres, high-value goods, or environments with significant airflow (loading bays, large open spaces) typically benefit from VESDA. For low-value, single-storey, ambient-temperature storage, standard ceiling detection may be adequate but the assessment should be made by a competent designer under BS 5839-1:2025.

Who is the responsible person for warehouse fire safety?

Under the Regulatory Reform (Fire Safety) Order 2005, the “responsible person” is typically the warehouse operator, the building owner, or in a multi-occupancy site the controlling party. They carry unlimited personal liability for fire safety failures, irrespective of contracted-out arrangements with security or maintenance providers.

Can one provider handle all our warehouse fire safety needs?

Yes and it’s the most efficient way to maintain consistent documentation. Full Circuit Fire & Security provides design, installation, and maintenance for warehouse fire alarms, plus aspirating detection, cold-rated detection, CCTV integration, and audit-ready service documentation under one contract SSAIB certified, BAFE accredited.

Book Your Free Warehouse Fire Alarm Survey

We offer warehouse and industrial operators a free fire safety survey designed around the coverage gaps insurers actually check. 90 to 120 minutes on site. Written report you can keep on file for insurance renewal conversations and BS 5839-1:2025 audit preparation.

Read more about our fire alarm installation service or read about our 40 years protecting commercial premises across the North West.

Call 01254 956 655, email quotes@fullcircuit.uk, or book a free quote online to arrange your survey.

Full Circuit Fire & Security has been protecting industrial premises across the Northwest since 1981. SSAIB Certified. BAFE Accredited. In-house engineers.