Tokyo Property Hazard Map And Road Access Official Links
When you’re buying or appraising real estate in Tokyo, two things can make or break your deal. Disaster risk (flooding, earthquake fire) and road access under the Building Standards Act, which determines whether you can rebuild at all and whether you’ll need to give up part of your land. Every judgment call here must be backed by official disclosures from individual ward offices and the Ministry of Land, Infrastructure, Transport and Tourism (MLIT).
1. National And Tokyo-Wide Integrated Hazard Maps (MLIT)
Your one-stop portal for comparing flood inundation, storm surge, landslide, and earthquake risk all in one place:
- MLIT: Overlapping Hazard Map System
- Tokyo Metropolitan Bureau of Urban Development: Regional Risk Survey For Earthquakes (risk levels by neighborhood block)
2. Ward-Level Flood And Inland Water Inundation Maps (Ward Office Portals)
Each special ward (Adachi, Koto, Setagaya, and so on) publishes its own inundation depth projections and evacuation guidance based on maximum assumed rainfall:
3. Building Standards Act Article 42 Road Classification Lookup (Designated Road Maps)
Figuring out whether the road fronting your property is a public road, a position-designated road (Article 42, Item 1, Clause 5), or a “Category 2 road” (Article 42, Paragraph 2 narrow road) requiring setback. This directly affects whether you can rebuild (or can’t) and how much of your lot is actually usable:
- Tokyo Metropolitan Bureau of Urban Development: Tokyo Designated Road Map And Building Standards Act Road Ledger System
- Each special ward’s building guidance division (建築指導課 / 建築安全課) road ledger terminals or online public systems.
4. Road Setback And Narrow Road Improvement Agreement Guidelines
When the fronting road is less than 4 meters wide, you must set back 2 meters from the road centerline (or from the designated boundary line) when rebuilding. Here’s where to find subsidy applications and free land-use lending rules (donation / tax exemption filings):