Alerts for a Customer With Hearing Loss

Why this matters

A man who hears well with his hearing aids is deaf in bed. A woman with a cochlear implant takes the processor off at night and hears nothing at all. The smoke alarm in the hall outside their bedroom was installed to code, interconnected, tested monthly, and it will not wake either of them. That gap is the one that matters, and it is mostly about the night, when the person is asleep and has removed whatever lets them hear in the day. Most of the fix is not wiring; it is choosing a device that actually wakes the person, and making sure it talks to the alarms already in the house.

What the codes require, and what they do not

The residential code requires smoke alarms in each sleeping room, outside each sleeping area and on each story, interconnected so one sounding sets off all of them in new construction (IRC R314, 2021 edition, as adopted), and carbon monoxide (CO) alarms where the house has fuel-burning appliances or an attached garage (R315). When a house undergoes alterations that need a permit, R314 generally brings the smoke alarms up to the new-construction rule, with exceptions for some kinds of work; the inspector applies it. The IRC does not require visible or tactile alarms in a dwelling.

NFPA 72, the National Fire Alarm and Signaling Code, sets how alarms and their notification appliances perform, in the edition your jurisdiction adopted. Its household chapter (Chapter 29 in recent editions) addresses occupants with hearing loss: for a sleeping person with mild to severe loss, a low-frequency (520 Hz) alarm signal, and for moderately severe to profound loss, a visible appliance together with a tactile one such as a bed shaker. Those provisions describe what a system must do when such appliances are provided or required by another law; in an existing private single-family house, nothing generally requires them. You are installing them because they work, not because an inspector will ask.

The ADA's design standards require visible alarms in certain hotel rooms and public spaces, which is where most people have seen them. They do not reach a private home. See related: What the ADA Does and Does Not Cover in a Private Home. In a rental, adding devices may be a reasonable accommodation the landlord must allow. See related: Reasonable Modifications for Tenants.

What actually wakes a person

Strobes are good at telling an awake person and poor at waking a sleeping one. Research on waking effectiveness published through the NFPA's Fire Protection Research Foundation found that strobe lights woke a small share of sleepers with hearing loss, while a low-frequency 520 Hz square-wave sound and a bed or pillow shaker did much better. That is why NFPA 72's household chapter pairs the visible appliance with a tactile one for moderately severe to profound loss.

Where a strobe is used in a sleeping room, NFPA 72's visible-signaling chapter (Chapter 18 in recent editions) calls for a higher intensity than in a hallway: 177 candela when the strobe is within 24 in of the ceiling, because smoke collects there and dims it, and 110 candela when mounted lower.

So, by the person's hearing at night, with any device removed:

An audiologist's description of the person's hearing is the input. Do not guess at it from how well they converse with you; ask what they hear with their devices out.

How the alerts connect to the alarms

The alarms detect; the accessories alert. There are four ways to connect them, and they are not interchangeable.

1. Wired interconnect accessories from the same alarm family: a strobe, relay or bedside unit on the same interconnect wire, triggered when any alarm in the house sounds. This is the most reliable path where it exists. Mixing manufacturers on one wired interconnect does not work unless the products are listed as compatible with each other; the interconnect signal is not standardized.
2. Wireless interconnect within one manufacturer's family, with a compatible bedside receiver. The IRC allows wireless interconnection in existing houses where running wire would mean removing finishes.
3. Listening receivers that sit near an alarm and recognize the sound pattern. Smoke alarms sound a temporal-3 pattern (three beeps, pause) and CO alarms a temporal-4 pattern (four beeps, pause), so a listening device can tell them apart and show which. These need no wiring, but they only hear the alarm they are near, and they depend on that alarm sounding loudly enough at the receiver.
4. A monitored security panel with listed notification appliances, which also brings a central station into it.

Devices built for this are tested under UL 1971, the standard for signaling devices for the hearing impaired; the alarms themselves are listed to UL 217 (smoke) and UL 2034 (CO). Check the listing on anything you install.

Power matters at night. A strobe draws far more than an alarm horn. A bedside receiver that runs a shaker needs battery backup, or a power cut, which is when fires and generator CO events cluster, turns the system off.

The rest of the house: doorbell, phone, weather

Fire and CO are the life-safety alerts. The rest are independence:

• Doorbell and knock signalers that flash a lamp or a dedicated strobe in several rooms.
• Phone and video-call signalers, often built into the phone or a captioned-phone device.
• A weather alert radio with a strobe and shaker output, for a house in tornado or flood country.
• A baby-cry or caregiver-call signaler, where the person cares for someone else.

Keep these visibly distinct from the fire alert, by color or by location, so a flashing lamp in the kitchen is never confused with the bedroom strobe. Many states run telecommunications equipment distribution programs that provide some of these devices, and some fire departments supply bed shakers; the customer's audiologist will know the local path. See related: Funding Paths for Home Modifications.

A worked example: the couple with the 2001 alarms

A couple in their seventies. He has profound loss and uses a cochlear implant whose processor comes off at night; she hears normally but travels to see their daughter several weeks a year. The house has three bedrooms on the main floor and a basement with a gas furnace. It has five hardwired, interconnected smoke alarms (one in each bedroom, one in the hall outside the bedrooms, one in the basement) with a manufacture date of 2001, and one plug-in CO alarm in the hall.

The age decides the first move. NFPA 72 calls for smoke alarms to be replaced no later than ten years from their date of manufacture, and CO alarms per their manufacturer. Alarms from 2001 are over twice that age, so all five come out, and adding accessories to them first would have meant doing the job twice.

The plan:

• Five new hardwired smoke alarms from one family, on the existing interconnect wiring. The hall and basement units are combination smoke and CO alarms, replacing the plug-in CO unit, which leaves CO alarms outside the sleeping area and on the furnace level; confirm the CO placement against the alarm maker's instructions and the code as adopted.
• In the main bedroom, a listed bedside receiver from the same family, triggered over the interconnect, driving a bed shaker under his mattress and a 177 candela strobe on the ceiling, within 24 in of it. The receiver has battery backup.
• A second strobe in the living room, where he reads in the evening with his processor on but may not hear an alarm from the basement.
• A doorbell signaler with a lamp flasher in the kitchen and the living room, in a different color from the fire strobes.

That is five alarms, one receiver driving one shaker and one strobe, one more strobe, and the doorbell signaler: the bed shaker is the device that wakes him, and everything else is for the day.

The hazards in the work. Replacing hardwired alarms is branch-circuit work: turn off the breaker feeding the alarm circuit, lock it, and prove dead on a known live source before and after, per NFPA 70E Article 120 (120.5 in the 2021 edition, renumbered in 2024), with work practices at 29 CFR 1910.333(b)(2). Use a ladder rated for the work, set on the floor, not on furniture, with the bed moved out from under the bedroom unit. The old alarms may be ionization type containing a small radioactive source; do not open them, and return or dispose of them as their maker or the local household waste program directs.

Return to service and test. Restore the breaker standing to the side of the panel. Confirm each alarm's power indicator shows mains power, not battery only. Then test, with the household told first and nobody asleep:

• Press the test button on the basement alarm: all five sound, the bedroom shaker runs and both strobes flash.
• Press the CO test on the hall combination unit: confirm the CO alarms sound their four-beep pattern and that the bedroom receiver signals CO distinctly, if it is designed to.
• Pull the receiver's plug: the shaker still runs on a test.
• He lies on the bed with his processor off while she presses a test button in the basement, and he says whether it woke him, or would have.

This house has no monitoring company. Where one does exist, the panel is put on test with the central station before any button is pressed, so nobody dispatches a fire truck to a test.

What changes the answer

A renter may be limited to wireless and listening devices that leave no holes; the landlord may have to allow more as an accommodation. A person living alone with profound loss has nobody to wake them, so the bed shaker is not one option among several; it is the job. A person with dementia and hearing loss may wake to the shaker and not understand it. That is a conversation with the family and the care team about the escape plan, not a device choice.

References

• International Residential Code, 2021 edition, R314 and R315, as adopted by your jurisdiction
• NFPA 72, National Fire Alarm and Signaling Code, Chapters 18 and 29, in the edition your jurisdiction adopted
• UL 217, UL 2034 and UL 1971 (product listings)
• NFPA 70E Article 120 (120.5 in the 2021 edition, renumbered in 2024), and 29 CFR 1910.333(b)(2)
• See related: How to Set Up Smart Devices With a Disabled User; Funding Paths for Home Modifications