Plan Change 120: The Risk Has Moved (And It's Now Yours, Developers)
By Deane Consultancy
Plan Change 120 changes the rules — but more importantly, it changes who carries the risk.
For years, Auckland's development landscape was driven by planning rules. If zoning allowed it, and you could navigate consenting, the pathway was relatively predictable.
That is no longer the case.
Under Plan Change 120, a fundamental shift has occurred: **risk is moving away from council and onto developers.**
Then vs Now: What's Actually Changed
**Previously:** - Risk sat largely in planning approval - Zoning dictated feasibility - Engineering constraints often emerged later
**Now, risk sits in three key areas:** 1. **Technical** — servicing, access, buildability 2. **Environmental** — flooding, overland flow paths, geotech constraints 3. **Financial** — whether mitigation costs kill the margin
The Illusion of Development Opportunity
Plan Change 120 introduces increased density allowances, transit-oriented development, and more "developable" land on paper.
But in reality, **zoning no longer guarantees feasibility in Auckland.**
We are already seeing sites that: - Appear viable under PC120 zoning - Fail due to stormwater or infrastructure constraints - Require costly engineering solutions that erode margins
Where Developers Get Caught
The biggest risk is false confidence at acquisition stage.
Projects fail when: - Due diligence is too shallow - Engineering input comes too late - Constraints are discovered after purchase
Common issues we see on the ground include: - Flood modelling limiting build area - Wastewater or stormwater capacity constraints - Access and servicing challenges - Ground conditions that significantly increase construction costs
The New Development Reality in Auckland
To succeed under Plan Change 120, developers must: - **Front-load engineering feasibility assessments** - Treat projects as multi-disciplinary from day one - Validate constraints before committing capital
Early-stage technical due diligence is no longer optional — it is critical.
Deane Consultancy Perspective
At Deane Consultancy, we see PC120 as a turning point.
The key question is no longer *"Can I zone it?"* — it's *"Can I actually deliver it?"*
We help developers answer that question before risk becomes cost. Whether it's a pre-purchase feasibility review, infrastructure servicing assessment, or full geotechnical investigation, getting the right engineering input early is the best investment you can make on any Auckland development project.
**Plan Change 120 creates opportunity — but only for those who understand the constraints.**
If you're not identifying risk upfront, you're carrying it blindly.
*This is the first in a three-part series on Plan Change 120. Read [Part 2 (Property Owner Impact)](/blog/plan-change-120-property-value-impact-auckland) and [Part 3 (Investment Risk)](/blog/plan-change-120-investment-risk-auckland).*
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- Stormwater & Wastewater — Detention design & flood risk assessment