Fire alarm information
for UK premises
in plain English

Over 30 years in the fire alarm industry I have watched building owners, facilities managers, and landlords face enforcement action, prosecution, and in the worst cases, the consequences of a fire in a building that was not properly protected.

Not because they did not care. But because the information available to them was either impenetrable technical language, or written by people trying to sell them something.

This site exists to help make working with your fire alarm easier, using straightforward information from someone who has spent a career in the industry.

“Am I legally compliant?”

Business owners and employers trying to understand what the law actually requires of them.

“What does my HMO need?”

Landlords navigating licensing requirements and trying to avoid costly mistakes.

“What should I expect to pay?”

Facilities managers trying to benchmark contractor quotes and maintenance contracts.

“What does BS 5839 mean?”

Building managers and managing agents trying to make sense of technical standards and inspection reports.

Standards & law

BS 5839 explained, the Fire Safety Order, grades A to F, what is and is not a legal requirement, and what happens when things go wrong.

System categories

L1 to L5, P1, P2, and Category M — what each covers, where each applies, and how the right category is determined by the fire risk assessment.

Design

Detector spacing, where to position detectors, sound level requirements, zoning rules, and zone plans — what BS 5839-1 requires at the design stage.

Installation

Cable types, panel siting, call point heights, power supply requirements, red cable — what a compliant installation looks like under BS 5839-1.

Testing & maintenance

Weekly tests, six-monthly servicing, log book requirements, who can service a fire alarm, and the consequences of missed maintenance.

Troubleshooting

Fault indications, false alarms, earth faults, battery faults, sounder faults — what each means and what to do about it.

Technology & equipment

Detection devices, sounders, control panels, cabling, wireless systems, suppression, ARC signal transmission, and hazardous areas.

Engineer guides

Commissioning, cause and effect programming, device addressing, and loop wiring — technical depth for engineers and facilities professionals.

Costs & contracts

Installation costs, maintenance contract pricing, fire risk assessment fees, and what to look for in a service contract.

Do I legally need a fire alarm?

The Fire Safety Order 2005 requires an appropriate means of detecting and warning of fire. For most non-domestic premises, this means a properly designed alarm system — the fire risk assessment determines exactly what is needed.

What category does my building need?

The fire risk assessment determines the required system category — from Category M (manual only) through to L1 (detection throughout the entire building). Getting the category wrong means either inadequate protection or unnecessary cost.

Why does my alarm keep going off?

The most common cause is the wrong detector type for the environment — a smoke detector near a kitchen, a dusty workshop, or a steamy bathroom. The solution is almost always a different detector type rather than a more sensitive setting.

How often does it need servicing?

BS 5839-1 requires a minimum of two professional service visits per year, plus weekly call point tests by a nominated member of staff. Annual-only servicing does not meet the standard’s requirements.

What does a fault on the panel mean?

A fault indication means part of your protection has been reduced or removed. Some faults are urgent — a sounder circuit fault means occupants in that area won’t be warned. Others are less critical. None should simply be silenced and ignored.

Who is responsible if I rent my premises?

As the tenant and employer, you are the Responsible Person for your demised area — not your landlord. This is one of the most common misconceptions in fire safety, and one of the most expensive to discover during an enforcement inspection.