DEMITONResearch / Rework statistics / No published New Zealand figure for the cost of setting-out, ground and external-condition failures
No published New Zealand figure for the cost of setting-out, ground and external-condition failures
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No published New Zealand figure for the cost of setting-out, ground and external-condition failures: no defensible figure has been published (Massey University (Maree, Rotimi, Rotimi), 2021; New Zealand; low confidence).
What it is. None: New Zealand sources count utility strikes or describe ground and weather costs qualitatively; none gives a cost per strike or a share of contract value.
Sample. Search terms: Before U Dig New Zealand utility strikes annual cost per strike; NZ Utilities Advisory Group strikes; Waka Kotahi utility strike research; SCIRT service strikes cost; New Zealand weather delays construction cost; Transmission Gully ground conditions cost; setting-out survey error cost New Zealand. A frequency exists but is not a cost: in a 2020 survey, 34 respondents reported 60 utility damage incidents in 2019 tied to missing or inaccurate as-built drawings and 50 for other reasons (Maree 2021, section 4.3); the same paper fits a line to those counts and says about 8 to 9 strikes per 100 excavations, a frequency from a 34-respondent sample, not a cost. Vendor blogs quote a New Zealand strike count (12,861 in 2020) and per-strike costs built on a UK multiplier; they were not opened at source and are not used. The Auditor-General's 2016 SCIRT report and MBIE weathertightness statistics were blocked to automated access and not read.
What it is not. Recorded as none on purpose: the New Zealand strike statistics found are counts of incidents or enquiries. Australian damage costs per strike in the corpus do not apply to New Zealand.
Where it came from
- Massey University (Maree, Rotimi, Rotimi) (2021), The Primacy of As-Built Drawings in the Management of Underground Utility Operations: A New Zealand StudySection 3 (method), section 4.3 (utilities damage records), Table 1 · source record
Considered and set aside
- Before U Dig (BUD): Reports 186,614 enquiries lodged in 2022 and 186 asset owners; publishes no national strike counts or costs.
- NZ Transport Agency, via the SCIRT Learning Legacy: Says tenders will ask for service-strike performance and that damage must be monitored; no strike counts or costs.
- SCIRT Learning Legacy: Christchurch rebuild summary with the $2.2 billion programme total; no strike, ground or weather cost.
- New Zealand Infrastructure Commission / Te Waihanga: States tunnelling in difficult ground can cost up to three times as much as in favourable ground; an international tunnelling comparison, not a New Zealand share of contract value and not about ground differing from the record.
- New Zealand Infrastructure Commission / Te Waihanga: Lists external events (earthquake, weather, COVID-19) among contributors to the overrun; no figure and no separation of ground conditions.
- Oxford Global Projects, for Te Waihanga: Says New Zealand estimated-versus-actual cost data were lacking, so no New Zealand overrun benchmark or cause split exists in it.
- PricewaterhouseCoopers, for the Department of Building and Housing: Prices the leaky-building repair bill (NZ$11.3 billion, 2008 dollars); those are building defects, not weather or ground conditions, and the report does not split them by cause.
- NZ Institute of Economic Research (NZIER), for BRANZ: Prices construction defects in new houses; setting-out error and weather damage are not separated.