Building Code clause H1 Energy efficiency sets minimum requirements for thermal performance in buildings. The Acceptable Solution and Verification Method that can be used to demonstrate compliance for all housing, and buildings up to 300 m2 are H1/AS1 5th edition amendment 1 and H1/VM1 5th edition amendment 1. BRANZ has produced a number of tools and resources around these.
BRANZ bulletins on the topic include BU672 Specifying floors under H1, BU670 Specifying windows and doors under H1, BU677 Specifying roofs under H1, BU678 H1 Calculation method - housing, and buildings up to 300 m2, BU685 Insulation of concrete slab-on-ground floors less than 300 m².
Resources and tools
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Clause H1 Energy efficiency
This clause of the New Zealand Building Code provides for the efficient use of energy and sets physical conditions for energy performance.
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BRANZ House insulation guide (6th edition)
Construction R-values for common construction options for compliance under H1/AS1 and H1/VM1 5th edition.
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H1 Calculation method tool [full]
This tool automatically applies the calculation method of H1/AS1 5th edition amendment 1 and generates a results page that can be used to demonstrate compliance.
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H1 Calculation method tool [Basic]
This tool checks for compliance of housing and small buildings with the calculation method of H1/AS1 5th edition amendment 1.
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H1 Hub
A collaborative initiative between BRANZ, MBIE, ADNZ, NZIA, WGANZ, IAoNZ, NZGBC, and FTMA. It provides H1 related search results across all our websites.
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H1 Schedule method calculation tool
Use this form to help demonstrate compliance under h1 Acceptable Solution H1/AS1 5th edition.
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Thermal bridging calculation tool
This tool determines the thermal performance of cavity insulated timber-framed walls. It may also be used to determine the steady state R-value (U-value) and compare results.
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Frequently asked questions
BRANZ is receiving numerous queries from the building industry about the new H1 Energy efficiency requirements. We answer some of the most common questions.
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Build Magazine H1 Articles
Search for H1-related Build magazine articles published recently.
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Previous H1 webinars
Supporting the industry to understand, comply with, and support, H1 changes.
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Updated: 04 April 2024