Old vs New Seismic Standards in Japanese Property: How to Use the 1981 Benchmark

For existing Japanese property, the seismic standard applied from June 1, 1981 is a major reference point when distinguishing newer and older standards. Construction year alone does not establish seismic performance. Buyers should review the building-confirmation timing, structure, seismic diagnosis and retrofit history.

Practical impact

General rules are not enough for an individual transaction. Combine current primary government sources with case-specific professional review.

Verification date

Based on primary official sources checked as of September 2, 2026.

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