H1 Energy efficiency

Provides for the efficient use of energy and sets physical conditions for energy performance.

This clause requires housing to meet a building performance index (BPI) not exceeding 1.55 (this is defined in the Verification Method and Acceptable Solution).

It requires enclosed spaces where temperature or humidity are modified to provide adequate thermal resistance and to limit uncontrollable airflow in certain buildings. It also sets out physical conditions likely to affect energy performance, and requirements for hot water systems, artificial lighting and HVAC systems.

Record of amendments is a record of changes to the Acceptable Solutions, Verification Methods and handbooks.

Digitising the Building Code

The Building performance team has started work to digitise the Building Code due to growing demands from building professionals who want vital information in a format that is portable, dynamic, feature-rich and digital. We have delivered the first of our Building Code PDF documents (B1, C/AS2, D1 and E2) into our digital reader.

More information on our digital reader.

Acceptable Solutions and Verification Methods

Current version

MBIE has historical versions of the code clause documents which can be located under 'Previous Versions' and 'Version History'. Alternatively if you cannot find the document you are looking for, you can send an email with the year and code clause you are after to info@building.govt.nz.


Acceptable Solutions and Verification Methods (AS and VMs) were called compliance documents. Some still have the “compliance document” title but the AS or VMs they contain are valid and unaffected by the name change.

Previous versions


Standards are frequently referred to in Acceptable Solutions and Verification Methods. They provide practical information and guidelines for building solutions.

Over 120 building standards used for Building Code compliance are now available for free download.

See the free standards relating to Code Clause H1.

All standards, including the funded ones, can be accessed through the Standards New Zealand website.

NZS 4218:2009 Thermal insulation – housing and small buildings

This Standard helps establish the levels of thermal insulation for houses and small buildings. When read in conjunction with Acceptable Solution H1/AS1, it provides a way of complying with the New Zealand Building Code in relation to the thermal insulation of houses for energy efficiency.

New Zealand Standard NZS 4218:2009 Thermal insulation – housing and small buildings


These documents are provided for assistance. They are not intended as a means of establishing compliance with the Building Act or Building Code, and they do not have the same status accorded to Acceptable Solutions and Verification Methods under the Act.

Related Determinations

Determinations are made by MBIE on matters of doubt or dispute to do with building work. Rulings are legally binding in relation to each case. Circumstances in one case may differ to others.

Related building products

All products, systems and construction methods that have achieved CodeMark status will be listed here with their most up to date certificate.

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: