Japan Real Estate Due Diligence, in English
Sumika is the only English-language property research tool that aggregates Japan's government hazard maps, actual transaction prices, and legal disclosures into a single professional report — no Japanese required.
Try a Sample ReportWhy Japan Real Estate Research Is Hard for Foreigners
Japanese-only hazard maps
Japan's official flood, earthquake, and landslide maps are only in Japanese. Interpreting 国土地理院 data requires local knowledge most foreign buyers simply don't have.
Opaque transaction prices
Listed prices rarely reflect what properties actually sell for. MLIT transaction records exist but are buried in a government portal — in Japanese, with no aggregation.
Complex legal disclosures
Stigmatised properties, asbestos, rebuild restrictions, soil contamination — Japanese law requires disclosure but the documents are dense, in Japanese, and rarely highlighted.
What's Inside Every Report
Flood depth, landslide probability, liquefaction risk, tsunami exposure, and predicted earthquake intensity — all in one 5-level score.
5 years of real sale prices within 500 m, sourced from MLIT. Compare list price to what buyers actually paid.
Stigmatised property history, rebuild eligibility, asbestos era flags, soil contamination risk, setback obligations, nuisance facilities.
Municipality-level crime rates from the National Police Agency. Includes national average benchmark and 5-year trend.
Estimated gross and net yield, after-tax cash flow, and exit scenario — calculated with actual management fees and tax rates.
Five-star suitability scores for families, elderly residents, single women, caregiving households, and investors.
Building Rules and Numeric Limits to Verify
Sumika does not issue legal compliance decisions. It turns public building and zoning data into concrete verification points for your agent, lawyer, architect, or inspector.
Residential, commercial, and industrial categories define what can be built.
Building footprint divided by land area. The exact cap depends on the local urban plan.
Total floor area divided by land area. Narrow road frontage can lower the allowed limit.
Checks whether the plot fronts a Building Standards Act road, which affects rebuildability.
Habitable-room daylight and natural-ventilation ratios to verify, especially for S/SR rooms.
Seismic threshold years plus location-specific shadow-control time ranges.
Simple Pricing
Start Your Research
Enter any Japanese address and receive a full due diligence report in English within minutes.
Get Your Report — ¥14,800For agencies and asset managers, monthly plans start at 20 reports/month. See business plans →
Reports available in English, Traditional Chinese, Simplified Chinese, and Japanese