70m² Granny Flat Exemption NZ Explained

70m² Granny Flat Exemption NZ Explained

The 70m² granny flat exemption in New Zealand has opened the door for more people to build small dwellings on their property. Since coming into effect in 2026, it has made the process simpler, faster, and in many cases more affordable.

However, there is still a lot of confusion around what the exemption actually allows. Many people assume it means you can build whatever you want, wherever you want, without council involvement. That is not the case.

This guide explains what the granny flat exemption really means, what is still required, and how to approach your project properly.

What is the 70m² Granny Flat Exemption?

The exemption allows you to build a self-contained dwelling up to 70m² without needing a full building consent, provided certain conditions are met.

This applies to:

  • Granny flats
  • Minor dwellings
  • Small standalone homes

The aim is to make it easier to increase housing supply while still maintaining building standards.

Does This Mean No Council Involvement?

No, this is where most of the confusion sits.

Even with the exemption:

  • You still need to engage with council
  • A Project Information Memorandum (PIM) is still required
  • Planning rules and zoning still apply

The exemption removes the need for a full building consent in specific cases, but it does not remove council oversight entirely.

What is a PIM and Why Do You Still Need It?

A PIM (Project Information Memorandum) provides information from the council about your site and proposed build.

It covers things like:

  • Land zoning
  • Services and infrastructure
  • Natural hazards
  • Compliance with district plan rules

This step ensures your granny flat is allowed on your property before you start building.

What You Can Build Under the Exemption

To qualify, your granny flat must generally:

  • Be 70m² or smaller
  • Meet Building Code requirements
  • Be built using compliant methods
  • Fit within local planning rules

You are not bypassing standards, you are simplifying the approval pathway.

What You Still Need Consent For

Even under the exemption, some elements still require approval:

  • Plumbing and drainage
  • Wastewater connections
  • Certain site works depending on location

This is important to factor into your planning and budget.

Granny Flat Cost NZ, What to Expect in 2026

The exemption can reduce costs, but it does not make building cheap.

Typical Cost Range

  • Basic granny flat:
    $120,000 – $200,000
  • Higher-spec builds:
    $200,000+

Where You Save Money

  • Reduced consent costs
  • Faster approval time
  • Less administrative work

What Still Drives Cost

  • Materials and timber
  • Foundation type
  • Services and connections
  • Design complexity

You can explore timber options here:
👉 https://onlinebuildingsupplies.co.nz/collections/timber

Materials Required for a Granny Flat

Even though it is a smaller build, the materials are similar to a full house.

Structural Timber

  • Framing timber
  • Treated timber for ground contact

Browse timber:
👉 https://onlinebuildingsupplies.co.nz/collections/timber

Fixings and Hardware

  • Structural screws
  • Brackets and connectors
  • Galvanised fixings

View hardware:
👉 https://onlinebuildingsupplies.co.nz/collections/hardware-fixings

Other Key Materials

  • Roofing
  • Cladding
  • Insulation
  • Interior linings

Common Misconceptions About Granny Flats NZ

“I don’t need to talk to council”

You do, the PIM process is still required.

“I can build anywhere on my property”

You must still comply with zoning, setbacks, and site rules.

“It’s much cheaper than a normal build”

It can be cheaper, but material and construction costs still apply.

Benefits of the 70m² Exemption

  • Faster pathway to build
  • Reduced upfront compliance cost
  • More flexibility for homeowners
  • Increased housing options

It makes building more accessible, but still structured.

Getting Your Materials Right from the Start

A granny flat build involves multiple materials and decisions early on.

Getting advice upfront helps ensure:

  • Correct timber selection
  • Accurate quantities
  • Cost control

You can:
👉 Browse timber: https://onlinebuildingsupplies.co.nz/collections/timber
👉 View fixings: https://onlinebuildingsupplies.co.nz/collections/hardware-fixings
👉 Get help with your materials list: https://onlinebuildingsupplies.co.nz/pages/contact

Final Thoughts

The 70m² granny flat exemption in NZ is a positive step that makes building smaller dwellings more achievable. It simplifies the process, but it does not remove the need for proper planning, compliance, and quality materials.

If you approach it correctly, it can be a faster and more efficient way to add space or create additional accommodation on your property.

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