Published March 2026 · 7 min read

What Plan Change 120 Means for Auckland Property Buyers in 2026

If you're buying property in Auckland right now, you've probably heard about Plan Change 120. Maybe your lawyer mentioned it, maybe you saw it on the news, maybe it came up on a LIM report. But what does it actually mean for you — the person about to make the biggest financial decision of your life?

Here's what you need to know, in plain language.

What is Plan Change 120?

Plan Change 120 (PC120) is a major update to Auckland's planning rulebook — the Auckland Unitary Plan. Auckland Council publicly notified it on 3 November 2025, and it does two big things at once.

First, it strengthens the rules around building in areas affected by natural hazards — floods, landslides, coastal erosion, and coastal inundation. Second, it refocuses where new housing can be built, concentrating density around transport hubs and town centres rather than spreading it evenly across every suburban street.

PC120 replaced the earlier Plan Change 78, which had required three-storey housing on most residential sites across Auckland — including in flood zones and areas far from public transport. After the devastating 2023 Anniversary Weekend floods, Auckland Council pushed hard for the ability to introduce tougher hazard rules. New legislation in August 2025 gave them that power.

Why should property buyers care?

The natural hazard provisions of PC120 have immediate legal effect from 3 November 2025 under section 86B of the Resource Management Act. This isn't a proposal sitting on a shelf — it's already changing how resource consents are assessed across Auckland.

Here's what that means in practice:

If you're buying in a flood zone: The revised Chapter E36 (Natural Hazards and Flooding) now classifies flood hazard areas into four categories — low, medium, high, and very high — based on the depth and velocity of floodwaters. Development is assessed against a risk matrix that combines the hazard category with the sensitivity of the proposed activity. In very high hazard areas, some types of development may not be possible at all.

If you're buying on a slope: Auckland Council completed a region-wide landslide susceptibility study (TR2025/7) in 2025 — the first in almost 30 years. These maps are now incorporated into the Unitary Plan under PC120 and are used when assessing resource consent applications. If the property you're looking at has moderate or higher landslide susceptibility, you'll likely need a geotechnical assessment before developing.

If you're buying near the coast: Coastal inundation and erosion rules have been strengthened. Auckland Council's Shoreline Adaptation Plans are progressively being finalised for each coastal cell. Some areas may eventually be designated as managed retreat zones.

If you're planning to develop or subdivide: The activity classification system has changed from "less vulnerable" and "vulnerable" to "less sensitive," "potentially sensitive," and "sensitive" — with sensitive activities further split based on occupancy frequency and public health risk. This affects what you can build and the consent pathway you'll need.

Where is PC120 up to right now?

As of March 2026, the picture looks like this:

• Natural hazard rules: In force now (immediate legal effect from 3 November 2025).
• Public submissions: Closed 19 December 2025. Over 10,000 submissions received.
• Further submissions: Closed March 2026.
• Summary of Decisions Requested: Expected 14 May 2026.
• Independent Hearings Panel: Hearings expected through 2026.
• Final decisions: Not anticipated until mid-2027.
• Government update: In February 2026, the government reduced Auckland's required housing capacity from approximately two million to 1.6 million homes. Auckland Council is working through what this means, but the natural hazard downzoning provisions are expected to be retained.

The key takeaway: the hazard rules are live now, but the broader zoning and density rules may still change before PC120 becomes fully operative.

What should you do before buying?

If you're in the process of buying an Auckland property, here's the practical checklist:

1. Check the hazard overlays. Use Auckland Council's free Flood Viewer and GeoMaps (Natural Hazards theme) to see what hazard layers affect the property. This takes five minutes and costs nothing.
2. Get a hazard report. A Know Your Risk NZ report checks the property against 7 hazard layers — floodplains, coastal inundation, overland flow paths, landslide susceptibility (both types), coastal erosion, and flood prone areas — and tells you what each finding means in plain language. It costs $49 and downloads instantly.
3. Order a LIM report. The LIM is the legally mandated disclosure from Auckland Council. Since October 2025, LIMs include improved natural hazard information including landslide susceptibility maps. A standard LIM costs around $375 and takes up to 10 working days.
4. Get insurance quotes early. Obtain quotes from at least three insurers before going unconditional. Ask specifically about flood excess, coastal cover, and the annual premium for the property address.
5. Talk to your lawyer about PC120. Ask your solicitor specifically how the current and proposed PC120 rules apply to any development plans you have for the property.

The bottom line

PC120 is the most significant change to Auckland's planning rules since the original Unitary Plan in 2016. For property buyers, the message is straightforward: check the hazard profile before you commit. The tools exist, the data is available, and the cost of checking is a tiny fraction of what you're about to spend on the property itself.