Tag Archives: PHPP

Using PHPP for Building Code H1 Compliance

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PHPP has been identified as a suitable building energy modelling tool for use to comply with the Building Code clause H1 using Verification Method H1/VM1 since the 5th edition (2022.) In the 5th edition of H1/VM1, PHPP version 9, 2015, was specifically referenced.

In the 6th edition of H1/VM1 (2025), the reference to PHPP has been removed and there is the following more general statement about modelling software:

2.2.3 Modelling software
2.2.3.1 If the application for which the software is to be used has been documented according to the ANSI/ASHRAE Standard 140 procedure, then the method shall pass the ANSI/ASHRAE Standard 140 test...

PHPP v9 was validated using ANSI/ASHRAE Standard 140 in 2019 and the report is available for reference. [PDF 2.9 MB]

PHPP v10 is also deemed validated as the Passivhaus Institut (PHI) has confirmed that “the algorithms for the calculation of the useful heating and cooling demand, as they become relevant in the framework of the ASHRAE 140 validation, have not been changed deliberately from version 9.6. For verification, PHI rechecked all test cases and found that the agreement has indeed not deteriorated.” [PHI letter, 3 June 2022]

Therefore, PHPP v9 and v10 are both valid for use to comply with the Building Code clause H1 using Verification Method H1/VM1 edition 6.

Jason Quinn has published guidance on how to use PHPP for H1/VM1 on his website that you may wish to refer to.

Want to purchase PHPP? You can buy it from our online shop here.

PHPP 10 cover photo

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How do I refer to my project?

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PHINZ has created a short guide to help with terminology when talking about projects that our members and other Passive House professionals undertake.

While PHINZ is focused on the Passive House standard, and other PHI standards, we know that not all projects are certified Passive Houses and that conversations regarding better performing buildings often seek to make comparisons.

This guide includes additional terms, common in the construction industry, to guide these conversations. The terms themselves and how they are used are not governed by PHINZ. We have included them in this guide to provide context, and to help members, sponsors, clients and journalists on Aotearoa’s journey towards the Passive House standard.

The guide is free to access on the downloads page or directly by clicking on the image below.

Please share the guide widely to support clarity around how we all refer to projects and understanding of what a Passive House project is. Greenwashing does no one any favours.

We also encourage Passive House professionals and others to read “Claiming the Passive House Standard” available on the downloads page. This covers legal aspects of false claims relating to use of the term “Passive House” which is protected in consumer law.

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Building Code update recognises the Passive House Planning Package (PHPP) for energy modelling

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On 29 November, MBIE released the 2021 update to the building code. The main changes include increasing insulation requirements and changes to Acceptable Solutions and Verification Methods.

However, quietly tucked way in H1/VM1 Energy Efficiency Verification Method is a section that now recognises the Passive House Planning Package (PHPP) as a modelling tool that can be used as a means of compliance.

This is really exciting because although the methods required for compliance with the Building Code still leave plenty to be desired (read out position paper here), PHPP is a reliable and accurate modelling tool when used correctly. Passive House designers and consultants receive training in the use of PHPP as part of their CEPH2 course and some of them offer it as an independent service – see certified Passive House designers and consultants here.

If you want to buy a copy of PHPP, we are a licensed reseller and you can purchase it from our online shop.

Watch this space for a further info and events relating to PHPP!

H1/VM1 Energy Efficiency Verification Method

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