Description

The thermal performance required of all new windows and doors increased on 3 November 2022. There are further increases coming in 2023.

Anyone using H1/AS1 and H1/VM1 for building consent applications can no longer use the 4th edition documents but must use 5th edition amendment 1.

For housing only, the minimum R-value for vertical windows and doors is now R0.37 for all climate zones (see Table 1). There will be further increases on two separate dates:

• On 1 May 2023, the minimum will increase to R0.46 for climate zones 3 and 4 and to R0.50 for climate zones 5 and 6.
• On 2 November 2023, the minimum will increase to R0.46 for climate zones 1 and 2.

For buildings up to 300 m² that are not housing, the minimum R-values for vertical windows and doors that now apply are R0.37 in zones 1 and 2, R0.46 in zones 3 and 4 and R0.50 in zones 5 and 6. As with housing, the requirement in zones 1 and 2 will increase on 2 November 2023 to R0.46.

Scope

This article covers: 

• Calculating R-values
• Skylights
• Solar heat gain and overheating