Short answer. Japan publishes no official rules for private household shelters: no national law requires, licenses or certifies them, and there is no obligation for households 1. The Cabinet's March 2026 shelter policy focuses on designating public and private buildings and says technical specifications, definitions and names for shelters are still being studied, with an update expected about a year later 12.
Is there a Japanese law on private shelters?
No. Japan has no national law that requires, licenses or certifies private or household shelters 1. Civil-protection law deals with evacuation facilities designated by prefectures in existing buildings, not with shelters built by individuals 3. Any construction still falls under ordinary building rules: ask your municipality's building department, in writing, which permits and inspections apply before you start.
What does the March 2026 shelter policy say?
The Basic policy on securing evacuation facilities (shelters) for emergencies, adopted by Cabinet decision on 31 March 2026, concentrates on designating buildings such as underground stations, shopping malls and car parks 12. On definitions it states: 「技術的な仕様や定義・名称等について、諸外国の事例も参考にしつつ、専門的見地から更なる検討を加え、１年後を目途に整理する。」 — technical specifications, definitions and names will be studied further, drawing on other countries' examples, and organised within about a year 1.
The incentives it considers, such as floor-area ratio relaxation for large buildings and awards for businesses, are not aimed at private homes 1.
Is an "earthquake shelter" the same thing?
No. Some municipalities subsidise earthquake shelters (耐震シェルター), which protect occupants if a house collapses, not against armed attack. For example, Kofu pays up to 360,000 yen for a one-room or bed-type earthquake shelter on the ground floor of an owner-occupied wooden house begun before 1 June 1981 with a seismic score under 0.7 4. These programmes do not cover blast or fallout shelters.
Is there a technical reference I can show an engineer?
The only official technical document is the non-binding Technical Guideline for Specified Temporary Evacuation Facilities (2nd edition, June 2024), written for public basement shelters 5. It is summarised on the shelter standards page. It is not a certification scheme, and applying it to a house is a job for a licensed engineer.
Who should design a shelter?
A licensed engineer. A buried or reinforced structure has to carry soil and water loads, stay dry and supply enough air; these depend on your site, and this page gives no construction instructions. Our guides help you ask the right questions:
- Can you bury a shipping container as a shelter?
- What it takes to make a shipping container safe underground
- What a shelter's protection factor is
- How much fresh air a shelter needs
- How NBC air filtration works
Do I need a private shelter if public facilities exist?
Japan designates 103,226 evacuation facilities, including 62,382 emergency temporary evacuation facilities and 4,540 underground ones (1 April 2026), and reports 100% population coverage of emergency temporary evacuation facilities for all designating authorities 7. These give short protection from blast and fragments, not long stays 1. Locate yours on the public shelters page.
What does the government recommend instead?
Household stockpiles of at least 3 days and ideally 1 week 1, knowing the nearest designated evacuation facility, and acting fast on a J-Alert message: go into a building or underground 6. See the emergency supplies and public shelters pages.
Frequently asked questions
Is it legal to build a bunker at home in Japan?
No national law bans, requires or licenses one 1. Ordinary building rules may apply: check with your municipality.
Is there a certified shelter standard in Japan?
No. There is no certification or approval scheme for shelter products; the 2024 guideline is non-binding and written for public facilities 5.
Will Japan publish shelter standards?
The March 2026 policy plans to organise specifications, definitions and names within about a year, and is studying standards including against nuclear attack 1.
Do subsidies exist for home shelters?
Municipal subsidies exist for earthquake shelters, such as Kofu's up to 360,000 yen, but they cover protection against house collapse only 4.
Sources
- 内閣官房 (Cabinet Secretariat) — 緊急事態を想定した避難施設（シェルター）の確保に関する基本方針（令和８年３月31日閣議決定） — https://www.kokuminhogo.go.jp/pdf/hinan/260331shelter_hontai.pdf (accessed 2026-10-20)
- 内閣官房 (Cabinet Secretariat) — 緊急事態を想定した避難施設（シェルター）の確保に関する基本方針（概要） — https://www.kokuminhogo.go.jp/pdf/hinan/260331shelter_gaiyou.pdf (accessed 2026-10-20)
- 内閣官房 (Cabinet Secretariat) — 避難施設 - 内閣官房 国民保護ポータルサイト — https://www.kokuminhogo.go.jp/hinan/index.html (accessed 2026-10-20)
- 甲府市 (Kofu City) — 甲府市木造住宅耐震シェルター設置事業費補助金交付要綱 — https://www.city.kofu.yamanashi.jp/kenchikushido/machi/sumai/taishin/documents/r8_syeruta_youkou.pdf (accessed 2026-10-20)
- 内閣官房 (Cabinet Secretariat) — 特定臨時避難施設の技術ガイドライン（概要）（第２版） — https://www.kokuminhogo.go.jp/pdf/hinan/240628_Guideline_gaiyou.pdf (accessed 2026-10-20)
- 内閣官房 (Cabinet Secretariat) — 弾道ミサイル飛来時の行動 — https://www.kokuminhogo.go.jp/kokuminaction/ (accessed 2026-10-20)
- 内閣官房・消防庁・内閣府 — 避難施設一覧の更新について（令和８年８月25日） — https://www.kokuminhogo.go.jp/pdf/hinan/01_R8hinanshisetu.pdf (accessed 2026-10-20)
Turn this into action
Your plan for Japan, worked out for your household.
- Water, food and equipment counted for each person and pet
- The nuclear plants and zones around your home
- Phaenyx Safe: one tap to tell your people you are safe
Sources
- 内閣官房 (Cabinet Secretariat) · 緊急事態を想定した避難施設（シェルター）の確保に関する基本方針（令和８年３月31日閣議決定） checked 2026-10-20
- 内閣官房 (Cabinet Secretariat) · 緊急事態を想定した避難施設（シェルター）の確保に関する基本方針（概要） checked 2026-10-20
- 内閣官房 (Cabinet Secretariat) · 避難施設 - 内閣官房 国民保護ポータルサイト checked 2026-10-20
- 甲府市 (Kofu City) · 甲府市木造住宅耐震シェルター設置事業費補助金交付要綱 checked 2026-10-20
- 内閣官房 (Cabinet Secretariat) · 特定臨時避難施設の技術ガイドライン（概要）（第２版） checked 2026-10-20
- 内閣官房 (Cabinet Secretariat) · 弾道ミサイル飛来時の行動 checked 2026-10-20
- 内閣官房・消防庁・内閣府 · 避難施設一覧の更新について（令和８年８月25日） checked 2026-10-20