Fire Alarm Sounder Levels in Healthcare: I.S. 3218:2024 Guide

Fire alarm sounder levels in healthcare are not just a technical measurement. They affect whether staff hear the alarm, whether residents are warned, whether communication remains possible, and whether vulnerable people can be moved safely.

The wrong approach can create risk in both directions. If sound levels are too low, staff may miss the alarm or residents may not be warned. If sound levels are achieved by placing a small number of very loud sounders in the wrong locations, the alarm may distress residents, make instructions harder to hear and disrupt the staff response. Compliance is not simply about making the building louder.

I.S. 3218:2024 gives the technical requirements for fire detection and alarm systems in Ireland. HIQA guidance adds the healthcare reality: residents may be heavy sleepers, medicated, hard of hearing, distressed by loud noise, unable to understand an alarm or completely dependent on staff for evacuation. A compliant system must work for that reality.

What I.S. 3218:2024 Requires

I.S. 3218:2024 states that fire alarm sound levels should be such that the fire alarm signal is immediately audible above ambient noise. The sound should have a minimum level of 65 dB(A), or 5 dB(A) above any other noise likely to persist for more than 30 seconds, whichever is greater.

The standard also sets an upper limit. The sound level should not exceed 118 dB(A) at any point where people are likely to be present. That maximum matters. A design that relies on excessive output from a small number of devices may pass one part of the design intention while creating a different problem for occupants and staff.

For buildings of residential institutional or residential other use, I.S. 3218:2024 sets a minimum sound level of 75 dB(A), and says the device should be located within the bedroom. The standard identifies residential institutional use as including hospitals, nursing homes and similar establishments used as living accommodation or for the treatment, care or maintenance of persons with illness or disability.

The standard also requires fire alarm sounder frequencies to be in the range of 500 Hz to 1,000 Hz, with at least one major frequency in that range where a two-tone alarm is used. Where audible alarms may be ineffective, including for people who are deaf or have hearing impairment, visual or tactile alarm devices or procedures for informing them must be considered.

Why Healthcare Is Different

In a normal office, the alarm is usually intended to make people stop work and leave by the nearest safe route. In a nursing home, many residents cannot respond in that way. Some may not wake. Some may wake but not understand the alarm. Some may become frightened, resist staff, leave a safe bedroom, or move towards a corridor when staff need them to remain supervised.

The fire alarm still has to give warning. That point is not optional. The challenge is that warning in healthcare is partly a staff action system. The alarm must tell trained staff where the fire may be, help them prioritise the affected compartment, and start the evacuation procedure before smoke spread makes the route unsafe.

That is why sounder design cannot be separated from the fire strategy. A centre using progressive horizontal evacuation, staff alarm arrangements, addressable detection and resident-specific evacuation plans needs an alarm system that supports all of those parts. A decibel reading on its own does not prove that the response will work.

Staff Alert Is Not a Substitute for Warning

Many nursing homes use a staff-alert or two-stage approach. That can be sensible where trained staff need to investigate quickly, identify the compartment, call for help and begin progressive horizontal evacuation. It can also avoid unnecessary uncontrolled movement by residents in unaffected areas.

However, a staff-alert strategy does not remove the need for effective warning. The fire strategy must explain who is intended to hear each signal, what action they take, how the system escalates, and how residents are protected while staff are responding. A quiet first stage that nobody acts on is not a healthcare solution. It is delay.

The sounder-level question should therefore be asked alongside cause and effect. What happens on activation of a bedroom detector? What happens if a manual call point is operated? Which staff hear the first signal? When does the wider warning operate? How is the fire service called? How are residents who cannot understand the alarm warned and assisted?

What HIQA Adds

HIQA's Fire Safety Handbook says providers must have an effective fire detection and alarm system. It also says the system should help staff identify the source of the alarm quickly and prioritise the compartment that may need to be evacuated.

HIQA tells providers to consider a range of warning systems, including audible, visual and tactile devices, taking account of the type of service and care being provided. It specifically refers to residents who are heavy sleepers, on medication that may reduce alertness, or have hearing or communication difficulties.

The handbook also recognises that loud alarms can affect some residents' behaviour and may make evacuation harder. It advises that decibel measurements should be carried out in a way that is sensitive to residents' needs and minimises disruption to their routine. That is a practical point, not a relaxation of the alarm standard.

The Problem With Corridor-Only Thinking

One common problem is trying to achieve bedroom sound levels from corridor sounders alone. Doors, layout, distance, furnishings and background noise all affect what is heard in the bedroom. The result can be too low a level in some rooms and excessive noise in corridors.

I.S. 3218:2024's wording that the device should be located within the bedroom for residential institutional and residential other settings is important. It encourages a more controlled design: appropriate sound in the room where warning is required, instead of simply increasing corridor volume and hoping enough sound reaches the bed space.

In practice, many appropriately located devices are usually better than fewer devices driven too loudly. This can help achieve audibility without creating unnecessary sound pressure in staff work areas, corridors or communal spaces where staff need to communicate during the incident.

Bedroom Design Is a Resident Safety Issue

Bedroom warning deserves particular care because this is where many healthcare residents are most vulnerable. At night, the resident may be asleep, sedated, without hearing aids, using oxygen, connected to equipment, or unable to call for help. Staff may also be further away than during the day.

The design should not assume a healthy adult response. The purpose of the alarm is not only to wake a person and expect them to leave. In many nursing homes, the purpose is to warn, trigger staff response and support a resident-specific evacuation plan. That plan may include reassurance, manual assistance, a wheelchair, ski sheet, oxygen support or behaviour support.

For that reason, bedroom sounder levels should be assessed together with bedroom doors, staff alarm response, call bell arrangements, resident dependency and night staffing. If the bedroom passes the sound test but staff cannot reach or assist the resident in time, the fire safety problem is not solved.

Communication During Evacuation

During a healthcare fire response, staff need to speak to each other and to residents. They may need to confirm the alarm location, call the fire service, direct staff to a compartment, reassure residents, give short instructions and coordinate evacuation equipment.

If the alarm makes speech impossible at the point where staff must coordinate, the design may be technically loud but operationally weak. This does not mean lowering sound levels below the standard. It means designing the system, alarm zones, staff alert arrangements, repeat panels and procedures so that warning and communication can both happen.

In larger or more complex premises, voice alarm or public address arrangements may be considered where suitable and properly integrated. HSA guidance notes that in more complex buildings, voice evacuation systems may be considered where people are unfamiliar with warning arrangements or phased evacuation is used. In healthcare, any such system must be assessed carefully against resident needs.

False Alarms and Alarm Fatigue

Unwanted alarms create another risk. If staff hear frequent false alarms, response can become slower. Residents may become distressed repeatedly. Family members may lose confidence. Staff may start treating an alarm as a maintenance issue rather than a life-safety event.

The solution is not to weaken warning. The solution is competent false alarm management: correct detector selection, good maintenance, proper cleaning, contractor controls, cooking controls, accurate logbooks and review of repeated activations. I.S. 3218:2024 includes false alarm investigation and recording for a reason.

Hearing Impairment and Sensory Needs

Healthcare providers should not assume that a louder alarm solves hearing impairment. Some residents may not hear the frequency well. Some may remove hearing aids at night. Others may be sensitive to sound and become distressed or disorientated.

I.S. 3218:2024 points to visual and tactile devices where audible alarms may be ineffective, and to procedures for informing people who are deaf or have hearing impairment. The National Disability Authority's Safe Evacuation for All guidance also reinforces the need to plan for people of different abilities rather than relying on one generic warning method.

For a designated centre, this should feed into resident-specific evacuation information. The question is not only whether the alarm sounds. It is whether this resident will be warned, reassured, assisted and moved safely by the staff on duty.

Testing Sounder Levels Properly

Sounder testing should be planned and recorded. Measurements should be taken with suitable calibrated equipment, in relevant rooms and areas, under conditions that reflect real use as far as practical. Doors matter. Background noise matters. Bedroom layout matters. So does whether the premises is occupied and how testing will affect residents.

The test should not become a paper exercise. If a bedroom fails to achieve the required level, the answer may be an additional sounder, relocation of a device, review of the door or layout, or a change in the alarm design. If corridors are painfully loud while rooms barely pass, the design should be questioned.

Results should be kept with the fire alarm records and reviewed when the building changes, bedrooms are altered, doors are replaced, sounders are moved, resident dependency changes, or the fire alarm system is upgraded.

What Should Trigger a Review

Sounder levels should be reviewed after a fire alarm upgrade, change of use, bedroom refurbishment, fire door replacement, extension, change in compartmentation, installation of acoustic doors, significant change in resident profile, repeated complaints about alarms, repeated unwanted alarms, or a drill where staff communication was poor.

A review may also be needed where residents with new hearing, sensory or communication needs are admitted. This does not necessarily mean changing the whole alarm system. It may mean a resident-specific plan, visual or tactile warning, staff briefing, a change to bedroom allocation, or additional equipment selected by competent persons.

Evidence for HIQA and Fire Safety Audits

Providers should keep evidence that the alarm system has been designed, commissioned, maintained and tested properly. Useful evidence includes I.S. 3218 confirmation documents, maintenance certificates, sounder-level records, false alarm logs, zone plans, cause-and-effect records, staff training records and drill debriefs.

The evidence should also show that resident needs have been considered. If a centre has residents who are hearing impaired, highly sensory sensitive, heavily sedated at night or unable to understand an alarm, the provider should be able to explain how those residents will be warned and assisted.

That explanation should be available to night staff as well as managers. A plan that only exists in a technical report will not help when the alarm activates at 3am during handover.

A Practical Design Approach

Start with the fire strategy. Is the building using total evacuation, progressive horizontal evacuation, a staff alarm arrangement or a two-stage strategy? Then confirm the people at risk. Are residents sleeping, sedated, hearing impaired, cognitively impaired, sensory sensitive or dependent on staff?

Next, design the warning system around the actual building. Use appropriate devices, locations, zones and repeater panels. Confirm the staff response. Confirm how residents with hearing or communication needs will be warned. Confirm how staff will communicate while the alarm is active. Confirm how unwanted alarms will be recorded and reviewed.

Finally, test the system as part of the wider evacuation arrangement. A sounder-level certificate is not enough if staff cannot read the panel, if the alarm zone is confusing, if the fire service call procedure is unclear, or if residents become distressed and unmanaged during drills.

Common Mistakes

The first mistake is arguing that healthcare settings should simply ignore sounder requirements because residents may be distressed. That is not acceptable. The alarm must still give effective warning.

The second mistake is treating the standard as a reason to over-sound the building. The goal is effective, compliant warning, not maximum volume. Excessive sound can make staff communication and resident reassurance harder.

The third mistake is relying on corridor sounders to solve bedroom warning. In residential institutional settings, the 2024 wording points towards devices within bedrooms. This should be checked carefully in nursing homes and similar premises.

The fourth mistake is forgetting individual needs. A resident who cannot hear, cannot understand the alarm or reacts badly to loud sound still needs a safe warning and evacuation plan.

How Phoenix STS Can Help

Phoenix STS provides healthcare fire safety training, fire risk assessment, fire alarm strategy review and fire drill support for nursing homes and designated centres across Ireland. We help providers look beyond a decibel figure and check whether the alarm system supports safe staff action and resident evacuation.

For related guidance, see our articles on I.S. 3218:2024, one-stage and two-stage fire alarm strategy in nursing homes and HIQA Regulation 28 fire safety compliance.

Frequently Asked Questions

Does I.S. 3218:2024 require 75 dB(A) in nursing home bedrooms?

For residential institutional and residential other buildings, I.S. 3218:2024 sets a minimum sound level of 75 dB(A) and says the device should be located within the bedroom. Competent design and testing are needed to confirm compliance.

Can sounder levels be reduced because residents have dementia?

Not simply for convenience. Resident needs must be considered, but the system still has to provide effective warning and comply with the applicable standard. The solution is better design, procedure and resident-specific planning.

Are visual or tactile alarms needed?

They may be needed where audible alarms are ineffective, including for people who are deaf or have hearing impairment. Procedures for informing those residents should also be in place.

Contact Phoenix STS

To discuss fire alarm sounder levels, alarm strategy or healthcare fire safety training, contact Phoenix STS on 043 334 9611 or use the Phoenix STS contact page.

This article is general guidance only. Fire alarm sounder levels and warning arrangements should be assessed by competent persons against I.S. 3218:2024, HIQA expectations, resident needs, the building fire strategy and current fire safety arrangements.