Balcony Smoking in Japan (2026): What the Nagoya Ruling Actually Held, and the Duty of Consideration

Where a balcony sits legally

In the model management rules published by Japan's Ministry of Land, Infrastructure, Transport and Tourism, balconies appear among the parts of a building that do not belong to an exclusively owned unit — that is, common property — while residents are recognised as holding an exclusive right of use over them (source: https://www.mlit.go.jp/jutakukentiku/house/jutakukentiku_house_tk5_000052.html). A balcony is therefore both "yours to use" and "part of the building as a whole". Neither "it is my flat, so anything goes" nor "it is common property, so no consideration is owed to the individual" is accurate as stated. The commentary to those model rules also notes that smoking may be addressed in a building's use regulations — whether it is permitted on common property, where, what residents must observe, and what follows a breach — and that smoking in a way that has regard to the surroundings is desirable for maintaining smooth communal living. The middle position, in other words, is the one the national model contemplates.

What the Nagoya judgment held

A resident on an upper floor claimed roughly 1.5 million yen from the resident below, alleging that balcony smoke worsened their health. The court awarded 50,000 yen. Commentaries consistently identify three points. First, that even within one's own property, restriction is unavoidable where an act causes significant detriment to a third party. Second, that balcony smoking can constitute a tort where the smoker knows of that significant detriment, continues despite repeated warnings, and takes no preventive measures. Third, that this analysis applies even where the use regulations contain no smoking prohibition. The period the court treated as tortious began after the management association had issued notices (sources: https://www.osakacity-mansion.jp/hanrei/hanrei-11, https://medicallaw.exblog.jp/19810179/).

What it did not hold

• It did not hold that balcony smoking is unlawful. It held that it can amount to a tort where particular circumstances accumulate
• It did not hold that a similar claim will succeed. Whether damages are awarded turns on the individual facts
• The 50,000 yen figure is not a going rate for this kind of dispute
• It did not address smoking before any warning or approach had been made
• It did not address detached houses or non-condominium housing
• It is a district court decision, not a Supreme Court statement of general principle

Citing it as proof that "you would win" is as inaccurate as citing the absence of a rule as proof that "nothing applies". This article does not reach a conclusion on any specific case; consult a lawyer if you are considering legal steps.

The Condominium Ownership Act frame

Article 6(1) of Japan's Act on Building Unit Ownership provides that unit owners must not engage in acts harmful to the preservation of the building, or other acts contrary to the common interests of unit owners in the management or use of the building; Article 6(3) applies this to occupants such as tenants. Article 57(1) allows the other unit owners collectively, or an incorporated management association, to demand that such an act cease — but Article 57(2) requires a resolution of the general meeting before proceedings may be brought (source: e-Gov https://laws.e-gov.go.jp/law/337AC0000000069). The statutory design assumes a management association working through procedure, not one household suing another out of the blue. Whether a given act is contrary to the common interests depends on the facts, so consult a lawyer or a condominium management professional.

Reading it from either side

For someone who smokes, the practical lesson is that what mattered was the conduct after being told — continuing despite repeated warnings and taking no steps. Checking your building's rules, and adjusting timing or location once a concern is raised, is the responsive part. For someone affected, the lesson is that going through the notice stage matters: the court treated the period after the management association issued notices. The step-by-step process is set out in our guide to raising a balcony smoking complaint, the pre-contract checks a smoker should make are in the balcony smoking and rental contract guide, and if there is nowhere indoors to smoke, nearby designated areas can be found on the MottoSuitai smoking area map.