G-06 Auckland location guide · review pending

Can I build a granny flat in Flat Bush?

Check the Flat Bush sub-precinct, stormwater network, flood information and site services before applying generic granny-flat guidance.

Possibly—but the locality alone cannot determine eligibility. The proposed building and the actual address must pass separate building and planning checks.

Indicative locality result

Gate 1

Building Act

Design check required

The Building Act exemption depends on the proposed building and the people responsible for the work.

Gate 2

Planning rules

Address check required

The NES-DMRU pathway, zone, overlays, precincts and other rules must be checked for the legal site.

Passing one gateway does not prove the other. This locality guide is information, not council approval.

Representative compact granny flat used to explain site checks in Flat Bush

Representative granny-flat design

Representative design only. Locality and address-level constraints determine whether and where a project may work.

Source: Ready to Build review image

What Flat Bush can—and cannot—tell you

The Flat Bush Precinct is divided into multiple sub-precincts with different development and subdivision provisions. Council records also describe drainage reserves used to manage flood risk and development effects on water quality.

Planned growth infrastructure is not evidence that an individual lot has capacity or that the same rules apply throughout Flat Bush.

Local checks to make

Start with these Flat Bush checks

  1. 01/

    Sub-precinct

    Locate the title within the current precinct maps and read the provisions for that sub-precinct, not the precinct name alone.

  2. 02/

    Stormwater and flood

    Check drainage reserves, flood maps, overland-flow paths and any site-specific stormwater requirements together.

  3. 03/

    Networks and site layout

    Confirm water, wastewater, access, easements, existing development and usable building area for the property.

Why the address changes the answer

A lot beside a drainage reserve can present a different buildable-area and stormwater problem from another lot in a different Flat Bush sub-precinct.