Self-certification for plumbing and drainlaying guidance

About this document

  • Published on 7 September 2026
  • ISBN: 978-1-997308-61-4 (Online)
  • 1st edition

Introduction

Use this guidance to help understand the self-certification for plumbing and drainlaying scheme and its place in the building consent system.

The guidance explains:

  • how the self-certification scheme works
  • who can use self-certification and when it applies
  • the role of BCAs, plumbers, drainlayers and other participants in self-certification
  • self-certification requirements in the building consent process.

Contents

The guidance includes:

  • how to use the self-certification for plumbing and drainlaying guidance
  • background to the self-certification for plumbing and drainlaying scheme
  • roles and responsibilities of BCAs, plumbers, drainlayers and other participants in self-certification
  • what plumbing and drainlaying can be self-certified
  • how to use self-certification for plumbing and drainlaying in the building consent system
  • scenarios for self-certification for plumbing and drainlaying. 

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 resources for the self-certification for plumbing and drainlaying scheme for step-by-step guides and other resources to help you understand the scheme. 

Resources for the self-certification for plumbing and drainlaying scheme

This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: