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Acceptable Solution H1/AS1: Energy efficiency for all housing, and buildings up to 300 m²

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Abbreviation
H1/AS1 (Sixth edition)
Version
Sixth edition
Valid from
27/11/2025
Information provider
Ministry of Business, Innovation and Employment,
Information type
Acceptable Solution,
Format
PDF,
Cites
This resource cites 14 documents (show Citations)
Description

Acceptable Solution H1/AS1 provides a means of compliance with Building Code Clause H1 Energy Efficiency. 

Clause H1 provides for the efficient use of energy and sets physical conditions for energy performance.

This document applies to:

  • a) housing; and
  • b) other buildings with a floor area of occupied space no greater than 300 m².

For buildings that do not meet these characteristics, refer to the Acceptable Solution H1/AS2 or Verification Method H1/VM2 as a means to demonstrate compliance or use an alternative means to demonstrate compliance.

Scope

This Acceptable Solution does not include the use of foil insulation.

This Acceptable Solution does not apply to buildings with curtain walling. For these, use Verification Method H1/VM1 or use an alternative means to demonstrate compliance.

Previous versions:
H1/AS1 (Fifth edition, Amd 1) (Fifth edition, Amendment 1)
H1/AS1 (Fifth edition) (Fifth edition, unamended)
H1/AS1 (Amd 4) (Fourth edition, Amendment 4)
H1/AS1 (Fourth Edition, Amendment 3)
H1/AS1 (Third Edition, Amendment 2)
H1/AS1 (Third Edition (unamended))
For assistance with locating previous versions, please contact the information provider.
Notes/comments

The main changes from the previous fifth edition, Amendment 1 of H1/AS1 are:

  • The schedule method has been removed from the acceptable solution.
  • In the calculation method, the minimum construction R-value for slab-on-ground floors has been removed.
  • The citation of NZS 4214 has been modified.
  • The method for determining the thermal resistance of framed walls has been revised and the wall R-value in the reference building heat loss equations has also been reduced.
  • The application of minimum construction R-values of heated ceilings, heated walls and heated floors has been clarified.
  • The method for determining the areas of roofs, walls and floors now requires the overall internal dimensions to be used.
  • References have been revised. 
  • Definitions have been revised to reflect the terms used in this acceptable solution.
  • The performance table for windows and doors in housing has been revised.
  • Thermal resistance of slab-on-ground floors has been revised.
  • The acceptable solution now refers to the Building Product Specifications for determining the thermal resistance of insulation materials. As a consequence, reference to AS/NZS 4859.1 has been removed.
View on Information Provider website Download this resource (PDF, 1.5MB)
For assistance with locating previous versions, please contact the information provider.

The main changes from the previous fifth edition, Amendment 1 of H1/AS1 are:

  • The schedule method has been removed from the acceptable solution.
  • In the calculation method, the minimum construction R-value for slab-on-ground floors has been removed.
  • The citation of NZS 4214 has been modified.
  • The method for determining the thermal resistance of framed walls has been revised and the wall R-value in the reference building heat loss equations has also been reduced.
  • The application of minimum construction R-values of heated ceilings, heated walls and heated floors has been clarified.
  • The method for determining the areas of roofs, walls and floors now requires the overall internal dimensions to be used.
  • References have been revised. 
  • Definitions have been revised to reflect the terms used in this acceptable solution.
  • The performance table for windows and doors in housing has been revised.
  • Thermal resistance of slab-on-ground floors has been revised.
  • The acceptable solution now refers to the Building Product Specifications for determining the thermal resistance of insulation materials. As a consequence, reference to AS/NZS 4859.1 has been removed.
This resource is not cited by any other resources.

Acceptable Solution H1/AS1: Energy efficiency for all housing, and buildings up to 300 m²

This document is not CITED BY any other resources:

Acceptable Solution H1/AS1: Energy efficiency for all housing, and buildings up to 300 m²

Description

Acceptable Solution H1/AS1 provides a means of compliance with Building Code Clause H1 Energy Efficiency. 

Clause H1 provides for the efficient use of energy and sets physical conditions for energy performance.

This document applies to:

  • a) housing; and
  • b) other buildings with a floor area of occupied space no greater than 300 m².

For buildings that do not meet these characteristics, refer to the Acceptable Solution H1/AS2 or Verification Method H1/VM2 as a means to demonstrate compliance or use an alternative means to demonstrate compliance.

View on Information Provider website Download this resource (PDF, 1.5MB)
Acceptable Solution H1/AS1: Energy efficiency for all housing, and buildings up to 300 m²
Description

Acceptable Solution H1/AS1 provides a means of compliance with Building Code Clause H1 Energy Efficiency. 

Clause H1 provides for the efficient use of energy and sets physical conditions for energy performance.

This document applies to:

  • a) housing; and
  • b) other buildings with a floor area of occupied space no greater than 300 m².

For buildings that do not meet these characteristics, refer to the Acceptable Solution H1/AS2 or Verification Method H1/VM2 as a means to demonstrate compliance or use an alternative means to demonstrate compliance.

View on Information Provider website Download this resource (PDF, 1.5MB)
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Acceptable Solution H1/AS1: Energy efficiency for all housing, and buildings up to 300 m²

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