Plan Change 120: Why Your Land Value May Change
By Deane Consultancy
Plan Change 120 doesn't just affect developers — it directly impacts property owners across Auckland.
Some properties will increase in value. Others may lose development potential entirely.
The difference comes down to risk — and how it's now being defined.
The Old Way: Zoning = Value
Traditionally, land value was driven by zoning, location, and market demand. If your property was zoned for development, its value typically increased. Simple.
The New Reality Under Plan Change 120
PC120 introduces detailed constraints that sit *on top* of zoning, including: - **Flood hazard mapping** - **Overland flow paths** - **Coastal risk areas** - **Land stability considerations**
This means two neighbouring Auckland properties can now have completely different development outcomes — even if they sit in the same zone.
The Hidden Risk for Property Owners
Many property owners assume: *"My land is upzoned, so it must be worth more."*
But in reality, the new constraints under PC120 can mean: - Buildable area is reduced by flood or flow path overlays - Development becomes more complex and costly to consent - Required mitigation works (stormwater detention, retaining, foundation upgrades) erode margin
In some cases, development may not be viable at all — regardless of what the zoning says on paper.
What This Means Before You Sell or Develop
If you're selling your property, considering subdivision, exploring development, or simply assessing long-term value, you now need clarity on: - **Site constraints** — what overlays apply and what they restrict - **Development feasibility** — whether the numbers still work given those constraints - **Required mitigation works** — and what they'll cost
Getting this wrong at the start is expensive. Discovering it late is worse.
The Shift in Responsibility
This is the key takeaway: **risk is no longer sitting with council — it now sits with the property owner.**
Under the old framework, many constraints only surfaced during the consenting process, often borne by the council to resolve. Under PC120, owners and developers are expected to identify and manage these risks themselves.
If issues are discovered late: - Buyers may renegotiate or walk away - Projects may stall mid-consent - The value you expected may not be realised
Deane Consultancy Perspective
We are increasingly working with property owners who simply need certainty — before they list, before they commit to a purchase price, or before they engage an architect.
Understanding your land *technically* is now as important as understanding its zoning.
Early advice from a geotechnical and civil engineering team can: - Protect your property value in negotiations - Identify constraints before they become costly surprises - Provide a defensible position if a buyer raises concerns
A pre-sale or pre-purchase feasibility assessment doesn't have to be a full investigation. Often, a desktop review and a brief site visit is enough to give you a clear picture.
**Plan Change 120 changes how land is valued in Auckland.**
It's no longer just *"What is it zoned?"* — it's *"What can actually be built?"*
*This is the second in a three-part series on Plan Change 120. Read [Part 1 (Developer Risk)](/blog/plan-change-120-developer-risk-auckland) and [Part 3 (Investment Risk)](/blog/plan-change-120-investment-risk-auckland).*
Our Engineering Services
- Geotechnical Engineering — Site investigations, foundation design & slope stability
- Structural Engineering — Residential & commercial structural design
- Civil Engineering — Earthworks, subdivision & resource consent support
- Stormwater & Wastewater — Detention design & flood risk assessment