How NZTA estimates project costs
The methodologies we use to estimate project costs are:
Factors that influence project costs
A wide range of factors can influence actual (final) projects costs, including:
- project scope, in particular function and form macro-level scope
- project detailed design decisions, particularly in relation to intersections/interchanges and structures, or changes in design standards
- project phasing and timing
- future escalation of labour costs and materials, and changes in property values
- the level of sector productivity gains that can be realised
- ground conditions identified during detailed design phases
- changes to consenting and/or other statutory approval requirements or timeframes, such as Resource Management Act changes (e.g. fast-track legislation)
- consenting requirements and conditions
- market capacity and capability at the point of tendering and the selected procurement method
- funding and/or financing options agreed for projects.
Our major project reports include cost information developed using these methodologies.
Major project reports
Our guidance on major projects outlines what type of cost information you can expect to see at different stages of the project lifecycle.
Guidance on major projects [PDF, 161 KB]
