1. The demolition process
Demolition runs survey → notification & neighbour briefing → protection and sorted demolition → disposal and grading. Above the Recycling-Act threshold a notification is required, and the presence of asbestos changes schedule and cost greatly.
2. Mandatory asbestos pre-survey
Since 2022, demolition/renovation above a size requires a qualified asbestos pre-survey and a filed report to the authorities. Older buildings are more likely to contain asbestos materials (sprayed, board), and missing it means legal breach and health risk.
3. Asbestos removal levels and cost
Asbestos is graded levels 1–3 by friability; higher levels need isolation and negative-pressure removal, raising cost. Removal runs from a few hundred thousand to several million yen by scale and level, and isn't fixed until survey results are in.
4. Construction Recycling Act — sorted demolition
Above a size, concrete, timber and asphalt must be separated for demolition and recycling (Construction Recycling Act). Mixed disposal isn't allowed; proper-disposal manifest tracking is required.
5. Demolition cost guideline
| Structure | Demolition (per tsubo) | Notes |
|---|---|---|
| Wood | approx. ¥30–50k | ancillaries, leftovers, grading extra |
| Steel (S) | approx. ¥40–60k | varies with plant/haulage |
| RC | approx. ¥50–80k | heavier, higher |
Narrow, dense sites or tight frontage roads push costs up via haulage. If combined with remodelling, see renovation & extension.
Common pitfalls
| Risk | Prevention |
|---|---|
| Skipping the asbestos survey → legal breach, stop-work | Always run and file a qualified pre-survey |
| Buried obstacles (old foundations, septic) → add cost | Anticipate via hearings and trial digs |
| Vibration/dust disputes with neighbours | Protection, watering and neighbour briefing in advance |
| Demolition omitted from the estimate → overrun | Fix cost after the survey and hold a contingency |
Demolition is not just "tearing down." The asbestos survey and sorting are legal duties, and missing them threatens both health and schedule. If you're considering a rebuild or renovation, pin down the demolition survey and cost first.
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