A quick decision guide for Canterbury homeowners, builders and designers.
Quick answer
| Your project | Report needed? |
|---|---|
| New home on TC1/TC2 | Almost always yes |
| New home on TC3 | Yes – plus deeper investigation |
| Major extension / addition | Usually yes |
| Rebuild on earthquake-affected land | Yes |
| Subdivision (new building platforms) | Yes |
| Retaining wall | Often – depends on height and loads |
| Deck, sleepout, pergola | Usually not (structural design may be) |
| Minor internal renovation | Usually not |
What a report covers
- Soil profile and bearing capacity (Scala penetrometer / hand auger)
- Liquefaction considerations where applicable
- Foundation recommendations suitable for consent