Granny flats foundations guidance
About this document
Introduction
Use this guidance to choose suitable foundation solutions for granny flats built under the granny flats building consent exemption.
The guidance:
- explains which foundation solutions are suitable for different ground conditions
- helps you choose an appropriate foundation type
- explains how foundation solutions comply with the New Zealand Building Code.
This guidance applies to granny flats that:
- are standalone new builds
- have a net floor area of 70 square metres or less
- are built under the granny flats building consent exemption.
The foundation solutions in this guidance are optional. You can use other foundation solutions if they comply with the New Zealand Building Code.
Contents
The guidance includes:
- the purpose of the guidance and who it is for
- the policy and regulatory context for granny flats
- ground conditions and foundation selection
- foundation types and design considerations
- glossary, test methods and example reports.
Disclaimer
This document is a guide only. It should not be used as a substitute for legislation or legal advice. To the extent permitted by law, the Ministry of Business, Innovation and Employment (MBIE) is not responsible for the results of any actions or omissions taken on the basis of information in this document, or for any errors or omissions.
Supporting resources
Visit the granny flats resources hub for videos and additional guidance about the granny flats exemption:
Building a granny flat: resources