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Building Smarter, Spending Less
Where does the NZ Build Costs Go Wrong?
Why does building infrastructure in New Zealand cost so much? New Te Waihanga research reveals what’s really driving project costs, and why smarter design, tighter scopes and better planning could be the key to building for less.
Team ConInnova
On 2 September, Te Waihanga, the New Zealand Infrastructure Commission, released new research examining why infrastructure costs what it does in New Zealand and where there may be opportunities to bring those costs down.
The report is not specifically about housing. It covers infrastructure more broadly, including roads, hospitals, water networks and power lines. However, many of its findings apply to the wider construction sector and provide a useful indication of where government agencies may focus as they look for better value from infrastructure spending.
The Infrastructure Cost Problem
The main message from Te Waihanga chief executive Geoff Cooper is straightforward. New Zealand spends heavily on infrastructure, but the results do not always match the level of investment. Compared with other high-income countries, New Zealand can spend more while achieving less.
The report, Making Every Dollar Count, brings together evidence on the factors that influence infrastructure costs and identifies areas where those costs can realistically be controlled. It builds on earlier Te Waihanga research into areas such as consenting costs, materials pricing and construction productivity, while adding updated data and analysis.
Importantly, the report challenges the assumption that infrastructure inevitably becomes more expensive over time. There have been periods when the real cost of certain types of infrastructure has fallen significantly.
Solar panel prices, for example, dropped by more than 90 percent between 1980 and 2012. Wind turbine costs fell by more than 30 percent between 2005 and 2017 after adjusting for inflation. These examples show that falling costs are possible when technology, scale, standardisation and delivery methods improve.
Motorways present a very different picture. The real cost per lane kilometre has more than tripled over the past two decades. This highlights an important divide. Standardised and repeatable infrastructure can become cheaper over time, while large and complex projects can move in the opposite direction.
What Drives Infrastructure Costs
Te Waihanga groups the main drivers of infrastructure costs into three broad areas.
Input costs include materials, labour, equipment and land. These costs can change quickly and are often influenced by international markets. When global prices for steel, fuel or construction equipment increase, New Zealand businesses feel the effects. Individual contractors usually have limited control over these wider market movements.
Construction productivity refers to how efficiently infrastructure is actually built. Improving productivity can reduce costs, but meaningful gains are generally gradual. Changes to skills, technology, processes and industry capacity can take years to produce significant results.
Project scope and design is where Te Waihanga sees some of the greatest opportunities for improvement in the short to medium term. Decisions about what gets built, how it is designed and how the project is planned can have a major effect on the final cost.
Projects based on repeatable designs, clear requirements and disciplined planning are generally easier to deliver efficiently. Projects that are repeatedly redesigned, expanded or customised during delivery create more opportunities for costs to increase.
Why Planning and Design Matter
For builders, subcontractors and other businesses delivering construction work, the findings around scope and design are particularly relevant.
The report suggests that one of New Zealand's strongest opportunities for controlling infrastructure costs is not simply finding cheaper materials or waiting for a major productivity breakthrough. It is improving the decisions made before and during construction.
Clear scopes, repeatable designs and fewer unnecessary changes can reduce uncertainty for everyone involved. Contractors can price work more accurately, procurement becomes easier to manage and unexpected variations are less likely to disrupt budgets and programmes.
This approach is already visible in parts of the public sector. Kāinga Ora has moved towards greater use of standardised housing designs and programme-based procurement rather than treating every development as an entirely separate project. Its experience provides a practical example of how repetition and standardisation can support more efficient delivery.
Te Waihanga's latest research strengthens the case for this type of approach and suggests similar thinking could become increasingly important across government infrastructure procurement.
The research will also contribute to a separate government-directed review of cost growth in the land transport sector. Businesses involved in roads and transport infrastructure should therefore pay attention to how these findings influence future procurement, project design and tender requirements.
What This Means for Construction Businesses
For businesses working across construction and infrastructure, there are several practical implications.
Prepare for more standardised projects. Public sector clients are likely to place greater emphasis on repeatable designs, consistent specifications and programme-based delivery. Businesses that can work efficiently within these systems may be better positioned for future opportunities.
Control variations carefully. Scope changes should be treated as genuine cost events. Clear variation and change-order processes help contractors identify the financial impact of changes early and protect both project budgets and margins.
Keep an eye on transport procurement. Te Waihanga's research is feeding into the government's work on land transport costs. Contractors and subcontractors involved in roading and transport should watch for changes to procurement expectations, project specifications and tender structures.
Question the assumption that costs must always rise. The report shows that infrastructure costs can fall when projects benefit from better technology, greater scale, standardisation and more efficient delivery. Cost increases should therefore be examined rather than automatically accepted as unavoidable.
The Importance of Cost Visibility
Better scope and design discipline also increases the importance of accurate cost information throughout a project.
If a project has a clear budget and defined scope, businesses need to know when actual costs begin moving away from what was originally estimated. Waiting until invoices arrive or the project reaches final reconciliation can mean problems are identified too late to do much about them.
A clearer view of estimated costs against actual costs allows contractors to identify the financial impact of variations, purchasing decisions and scope changes while the project is still underway.
This becomes even more valuable when working with standardised designs. If similar projects are delivered repeatedly, businesses can compare estimated and actual costs across jobs, identify recurring overruns and improve future pricing.
Construction cost management tools such as Civcost are designed around this problem. Having reliable cost tracking in place can help businesses adapt to an environment where clients expect tighter scopes, clearer pricing and greater accountability for project costs.
The Bigger Picture
Te Waihanga's research does not introduce an immediate new requirement for builders or subcontractors. Instead, it provides government-backed evidence for a broader shift that is already taking place across infrastructure delivery.
Materials and labour will always influence construction costs, particularly in a small market exposed to international price movements. Productivity improvements will also remain important. However, both can be difficult to change quickly.
Scope, design and planning offer a more immediate opportunity.
For construction businesses, that means the ability to price clearly, manage variations, track costs and deliver efficiently against repeatable specifications is likely to become increasingly valuable as government agencies look for better returns from infrastructure spending.
Businesses that build these capabilities now will be better prepared if standardisation and tighter cost control become a larger part of public sector procurement over the coming years.
References
New Zealand Infrastructure Commission Te Waihanga, “What Drives Infrastructure Costs, And Where Can We Make A Difference”, 2 September 2026.
Business Scoop, “What Drives Infrastructure Costs – And Where Can We Make A Difference”, 2 September 2026.
Te Waihanga, “The Cost of Consenting Infrastructure Projects in New Zealand”, background report by Sapere, July 2021.
Te Waihanga, “Pipeline Snapshot”, updated August 2026.
