A quick guide to what your project usually needs – and what’s typically involved.
The short version
| Project | You usually need | Typical investigation / work |
|---|---|---|
| New home (TC1/TC2) | Geotechnical report + foundation design | Scala/auger testing; bearing capacity; slab/foundation design |
| New home (TC3) | Enhanced geotech + deep foundation design | CPT + liquefaction modelling; piled/stiffened foundations |
| Extension / addition | Geotechnical report (often) + structural | Depends on scale, loads and existing foundations |
| Subdivision | Geotechnical investigation across lots | Plate testing per lot; TC zoning; liquefaction; platform levels |
| Retaining wall | Geotechnical + structural design | Investigation; wall design; PS1 and PS4 |
| Deck, sleepout, granny flat | Structural engineering (often a geotech check) | Design and documentation for consent (PS1) |
| Remove a wall / install a beam | Structural design – and often more | Beam design, plus often new bracing and possibly foundation strengthening |
| Earthquake damage / insurance | Damage assessment | Inspection; foundation/structural performance; written opinion |
| Exploration / resource | Geological & resource services | See Exploration |
Guides only – requirements depend on your site and project. Send the address and what you’re planning and we’ll confirm.