5.2 Ground moisture barrier

Ground moisture barrier

A building consent is not required for the installation of a ground moisture barrier in an existing building.

This exemption reflects that the installation of ground moisture barriers is building work with a low risk of causing danger to people or damage to other buildings.

Amended July 2019
Clause 13A of Schedule 1 was inserted, as from 1 July 2019, by the Building (Exempt Building Work) Order 2019.

The Residential Tenancies (Healthy Homes Standards) Regulations 2019, which came into force on 1 July 2019, set minimum requirements for rental properties in relation to heating, insulation, ventilation, moisture ingress and drainage, and draught-stopping.

This includes a requirement that all residential rental premises with enclosed subfloor spaces must have ground moisture barriers installed in those spaces where reasonably practicable.

The regulations provide a transitional period to give landlords time to comply with the new standards:

Healthy homes compliance timeframes | Tenancy Services

What is exempt

  1. The subfloor space within an existing house is being retrofitted with a ground moisture barrier.

What needs consent

  1. A ground moisture barrier is to be installed within the subfloor space of a new house under construction.

What the law says

13A. Ground moisture barrier

Building work in connection with the installation in an existing building's subfloor space of a ground moisture barrier.

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: