Residential Fire Alarms Are Required in Bedrooms and on Stairs; Replace Them About 10 Years After Installation

Under the Fire Service Act (消防法), homes in Japan must have residential fire alarms (住宅用火災警報器). The minimum places to install them are the same nationwide: bedrooms, and the stairs on the floor where a bedroom is located. Whether alarms are also required in kitchens, living rooms, and other places is decided by each municipality’s fire prevention ordinance (火災予防条例); within the jurisdiction of the Tokyo Fire Department, they are required in every room in regular use, in the kitchen, and on the stairs. The Fire and Disaster Management Agency says that the service life of an alarm is considered to be 10 years, and urges people to replace the whole unit about 10 years after installation.

Based on the laws as of October 2026 and materials published by the Fire and Disaster Management Agency, the Tokyo Fire Department, and the Japan Fire Equipment Inspection Institute (日本消防検定協会), this article summarizes when installation became mandatory, where to install alarms, who the “persons concerned” are in a rented home, replacement after 10 years, the sounds that mean a dead battery or a fault, and a warning about abusive door-to-door sales. We do not recommend any particular product, manufacturer, or shop. We do not judge what an individual home needs; we point to where you can check.

The Law Places the Duty on “Persons Concerned,” and Municipal Ordinances Decide the Locations

Article 9-2 of the Fire Service Act provides that the “persons concerned” (関係者) of a residence “must install and maintain” residential fire-prevention equipment (住宅用防災機器) in accordance with the standards for its installation and maintenance. Those standards are to be “set by municipal ordinance” in accordance with the standards set by Cabinet Order (e-Gov Japanese Law Search, version in force from June 1, 2025). Article 2, paragraph 4 of the same Act defines “persons concerned” as the owner, manager, or occupant of a building subject to fire prevention.

The Cabinet Order, the Order for Enforcement of the Fire Service Act (消防法施行令), provides in Article 5-6 that residential fire-prevention equipment is either a residential fire-prevention alarm (住宅用防災警報器) or a residential fire-prevention alarm system (住宅用防災報知設備), conforming to the technical standards of an ordinance of the Ministry of Internal Affairs and Communications. Article 5-7, item 1 provides, as the standard for drafting ordinances, that detectors be installed in the following places.

• A room used for sleeping (a bedroom)
• Stairs leading from the floor where a bedroom is located (excluding the evacuation floor) to the floor directly below (excluding stairs built outdoors)
• In addition, the parts of floors with living rooms that are specified by an ordinance of the Ministry of Internal Affairs and Communications as places where early detection of fire is particularly necessary

Item 3 of the same Article provides that where a sprinkler system or an automatic fire alarm system is installed to a certain standard, a residential fire-prevention alarm may not need to be installed within that area.

Since When Has Installation Been Mandatory?

Date	What happened	Source
June 2, 2004	An amendment to the Fire Service Act (Act No. 65 of Heisei 16) was promulgated. Article 9-2, which provides for residential fire-prevention equipment, was newly added	Supplementary provisions of the Fire Service Act (e-Gov)
June 1, 2006	Applied to newly built homes. The Cabinet Order provisions on residential fire-prevention equipment took effect the same day	Fire and Disaster Management Agency materials; supplementary provisions of the Order for Enforcement of the Fire Service Act (Cabinet Order No. 325 of Heisei 16)
Date set by municipal ordinance (in force by June 2011)	Applied to existing homes. The date is set by each municipality’s ordinance	Article 2 of the supplementary provisions of the amending Act; Fire and Disaster Management Agency materials
Tokyo Fire Department jurisdiction: October 1, 2004 (new construction and rebuilding), April 1, 2010 (existing homes)	Under the Tokyo Metropolis fire prevention ordinance. The island areas and Inagi City are excluded	Tokyo Fire Department
April 1, 2014	Residential fire alarms became subject to national type approval testing, and products began to carry a pass mark	Fire and Disaster Management Agency; Japan Fire Equipment Inspection Institute
March 31, 2019	The deadline until which products bearing the “NS mark,” which was attached before the type approval system, could be sold as equivalent to approved products	Fire and Disaster Management Agency; Japan Fire Equipment Inspection Institute; supplementary provisions of the Order for Enforcement of the Fire Service Act (Cabinet Order No. 88 of Heisei 25)
June 2021	10 years had passed since installation became mandatory for existing homes	Fire and Disaster Management Agency

The Fire and Disaster Management Agency explains: “Existing homes: the date set by each municipal ordinance (in force by June 2011 [Heisei 23]).” In other words, June 2011 is the “latest” deadline for existing homes, and the actual date differs by municipality. In some areas, such as the jurisdiction of the Tokyo Fire Department, the requirement began earlier than that.

Where to Install: The Nationwide Minimum and the Places Ordinances Add

The Fire and Disaster Management Agency explains that residential fire alarms must “basically be installed in bedrooms and at the top of the stairs on the floor where the bedroom is located (excluding stairs on the first floor).” According to the Japan Fire Equipment Inspection Institute, a bedroom here means the room where people usually sleep; it includes children’s rooms and excludes a guest room where visitors only occasionally stay. On stairs, the alarm goes on the ceiling or wall of the landing. In homes with many floors or floors with many rooms, alarms may also be needed on other stairs and in corridors.

The Agency then explains: “Depending on the municipal fire prevention ordinance, there are areas where installation is also required in the kitchen and other rooms.” It directs people to ask the fire department headquarters or fire station that has jurisdiction over their municipality where alarms are required.

Place	Nationwide standard (Order for Enforcement of the Fire Service Act)	Tokyo Fire Department jurisdiction (fire prevention ordinance)
Bedroom	Install	Install (included in rooms in regular use)
Rooms other than bedrooms (living room, dining room, children’s room, and so on)	Not in the standard; set by ordinance	Install
Stairs	Stairs leading from the floor with a bedroom to the floor directly below (excluding the evacuation floor)	Install (stairs inside a home; the shared stairs of an apartment building are not needed)
Kitchen	Not in the standard; set by ordinance	Install (smoke type or heat type)
Bathroom, toilet, washroom, storeroom	Not in the standard; set by ordinance	Not included

The Tokyo Fire Department explains that under the installation standard in the Tokyo Metropolis fire prevention ordinance, alarms go in all rooms in constant, continuous use, in the kitchen, and on the stairs. Rooms that already have an automatic fire alarm system or a sprinkler system do not need a new alarm. The Department explains that materials from other prefectures saying “bedrooms and stairs only” reflect the fact that the standard differs by municipal ordinance.

Smoke Type and Heat Type

According to the Fire and Disaster Management Agency, what the law requires in bedrooms and on stairs is the smoke type (photoelectric), which detects smoke. The heat type (fixed-temperature) sounds when the surrounding temperature reaches a set level, and is said to suit places with a lot of smoke or steam, such as kitchens and garages. The Tokyo Fire Department specifies that kitchens get either a smoke type or a heat type, and, because the smoke type can detect a fire earlier than the heat type, recommends the smoke type in the kitchen as well.

Who Installs the Alarm in a Rented Home?

As seen above, the law places the duty on the “persons concerned,” that is, the owner, manager, or occupant. The Tokyo Fire Department says that in a rented home, the owner is the landlord, the manager is the real estate agency or management company, and the occupant is the tenant, and the duty to install arises for all three. It then advises that, in practice, the persons concerned discuss it according to the circumstances of each home and decide who will finally install it.

This article does not judge who bears the installation or its cost. Whether the room you rent already has an alarm, when it was installed, and who replaces it: check the contract and ask the landlord or the management company. The process of renting a room is covered in our article on renting a home in Japan.

Replace About 10 Years After Installation

The Fire and Disaster Management Agency says that residential fire alarms are always operating in order to detect fires, that their service life is considered to be 10 years, and it urges people to replace them about 10 years after installation. The Japan Fire Equipment Inspection Institute also gives 10 years as the guideline for replacement. The Tokyo Fire Department recommends replacing the unit itself, because as it ages, deterioration of electronic parts or a dead battery may keep it from detecting a fire. You replace the whole unit, not just the battery.

The Tokyo Fire Department advises writing the month and year of installation on the side of the unit when you put it up. According to the Japan Fire Equipment Inspection Institute, the front of the unit carries either “with automatic test function” or a “replacement deadline,” and the replacement deadline is the minimum period for which the unit can operate effectively, calculated from the reliability of electronic parts and the soiling of the insect screen, sensor, and so on.

In a survey result the Fire and Disaster Management Agency sent to prefectures and others (as of June 1, 2025), about 32.2% of residential fire alarms were past 10 years since installation, and a dead battery or fault was found in about 3.5% of the households where operation was checked. The survey is a sample survey, and the figures contain error.

Checking the Alarm, and the Sounds for a Dead Battery or Fault

According to the Tokyo Fire Department, you check the alarm by pressing the button on the unit or pulling the attached cord. If it is normal, a voice message or alarm sound announcing that it is normal will play; if it does not sound, the battery may be dead or the unit may be faulty. The Fire and Disaster Management Agency says that dust getting inside can cause false alarms, and that cleaning methods differ by model, so it directs people to the instruction manual.

According to the Japan Fire Equipment Inspection Institute, when the battery is about to run out, the unit is designed to tell you by sound or light; for sound, a single “beep” repeated at intervals of about one minute is recommended. When the automatic test function finds a fault, a “beep, beep, beep” repeated at intervals of about one minute is recommended. However, these are “recommended” sounds and may differ by model, so you need to confirm the actual sound in the instruction manual. If it sounds without a fire, for example from cooking smoke, the Tokyo Fire Department says it stops when you press the stop button, pull the cord, or ventilate.

The Tokyo Fire Department advises that the unit is often sorted as non-burnable waste and the battery as hazardous waste, but that you should dispose of them following your local government’s rules. How to sort and put out garbage is decided by each city, ward, town, or village, and is covered in our article on sorting garbage.

The Type Approval Mark and the NS Mark

According to the Fire and Disaster Management Agency and the Japan Fire Equipment Inspection Institute, residential fire alarms became subject to national type approval testing on April 1, 2014, and products carrying the pass mark are sold as conforming under the type approval system. Before that, most products carried the “NS mark,” and because they were considered to have performance equivalent to approved products, they were allowed to be sold until March 31, 2019. The Tokyo Fire Department advises that products carrying the type approval mark conform to the standards set by national laws and regulations.

Deaths in Home Fires, and What Alarms Do

According to Fire and Disaster Management Agency materials, of 37,141 fires nationwide in 2024 (Reiwa 6), 11,839 (31.9%) were home fires, and of 1,451 deaths from fires (including arson suicides and similar cases), 1,109 (76.4%) were deaths in home fires. Of the 1,030 deaths in home fires excluding arson suicides and similar cases, “failure to escape in time” was the most common at 465 (45.1%), and 320 people (31.1%) died between midnight and 6 a.m.

The Fire and Disaster Management Agency compiled the four years from 2020 to 2023 and says that where a residential fire alarm was installed, compared with where none was installed, the number of deaths and the amount of damage were roughly halved, and the burned floor area fell by about 60%. The Tokyo Fire Department also reports that in 2024, within its jurisdiction, the number of fires with deaths per 100 home fires was 9.6 in homes with no alarm or similar equipment and 3.0 in homes with one installed. Fires from heating appliances such as kerosene stoves are covered in our article on winter heating and carbon monoxide. The phone numbers to call in a fire are in our article on 110, 119, and #7119.

How Many Homes Have Them?

In the Fire and Disaster Management Agency’s survey, the nationwide installation rate as of June 1, 2025 was 84.9% and the ordinance conformity rate was 65.8% (as of June 1, 2022, 84.0% and 67.4%). The installation rate is the share of households with at least one alarm in the parts of the home where the ordinance requires them, and the ordinance conformity rate is the share of households with alarms in all the parts where they are required. Both include households exempted because an automatic fire alarm system is installed.

No Penalty, and Beware of Abusive Door-to-Door Sales

Asked about penalties for not installing a residential fire alarm, the Fire and Disaster Management Agency answers, “There is no penalty.” The Tokyo Fire Department also says that the Tokyo Metropolis ordinance specifies no penalty for not installing. Both nonetheless urge people to install alarms soon to protect their lives.

According to the Fire and Disaster Management Agency, there have been reports of door-to-door sales that demand high prices by saying “the law requires it” or “it is a violation if you don’t install one,” and of salespeople who claim “I’m from the fire department.” The Tokyo Fire Department says that fire stations do not ask particular companies to sell alarms and do not sell them directly. The Agency advises people who have been deceived to consult their local fire station or consumer affairs center, and says residential fire alarms are a product covered by the cooling-off system.

Where to Check, and the Autumn Fire Prevention Campaign

You can ask the fire department headquarters or fire station that has jurisdiction over your municipality which places require an alarm. For installing or replacing alarms in a rented home, check the contract and ask the landlord or the management company.

The National Fire Prevention Campaign (全国火災予防運動) is held each year from March 1 to 7 in spring and from November 9 to 15 in autumn, and in step with it the Fire and Disaster Management Agency publicizes “10 Points for Protecting Lives: Fire Prevention in the Home.” The autumn 2025 campaign ran from November 9 to 15, and fire prevention in the home was among its priority items.