The Study

Climate zone 54 is next up - Mandurah. This climate zone includes the coastal strip south of Perth right down to Augusta, and includes the towns and areas surrounding Bunbury, Busselton and Margaret River. We do a lot of work in this climate zone, and feel like we have a pretty good handle on how to achieve good results in this climate zone!

Australian Housing data reports 5,272 dwellings have been certified in this climate zone, with a wide spread of ratings - but most between 6.0 and 6.5 stars, with a decent level of higher performing designs (around 25% rating at 6.5-7.5 stars)

Our ten recent houses rated at 6.89 stars on average in this climate zone. With no changes to the design or specs, only updated for NCC22 requirements and information - the average rating rose to 7.28 stars - an increase of 0.39 stars.

This climate zone was the most favourable of the nine we have looked at - with all designs getting some performance boost of between +0.2 stars and +0.6 stars

What does this mean?
The updated weather files and star bands are likely to be quite favourable in this climate zone. Its likely that a design which achieves 6.6 stars under NCC19 is likely to achieve compliance under NCC22 with no changes to design or specification.

Manjimup - Zone 57 - in an interesting climate zone, did you know it is not even used for the town of Manjimup? Instead, it is used for Nannup and a the areas to the West of Manjimup, as well as an isolated area around Rocky Gully for some strange reason.

The Aust. housting data portal reports only 143 dwellings certified in this climate zone in the last three years - all rating between 6.0 and 6.9 stars,

We have taken ten recently modelled projects, and located them in Zone 57. On average, these ten dwellings rated at 5.77 stars. We then adjusted the requirements to reflect the weather files, star rating bands, and updated assessment conditions for NCC22 - and the average star rating dropped slightly to 5.75 stars, a drop of 0.02 stars.

Most dwellings in this zone had no change to their star rating, some lost -0.1 stars, while others gained +0.1 stars.

What does this mean?
The impact of NCC22 updates is unlikely to have much of an impact in this climate zone. Projects rating at 7.0 stars under NCC19 will likely be compliant at 7.0 stars under NCC22.

Swanbourne - Zone 52 is the next climate zone to have a look at the impact of NCC22 changes. This climate zone is used for the narrow coastal strip in Perth metro, and extends north to Lancelin.

2,856 dwellings have been certified in this zone in the last three years, according to thehousing data portal. A very wide spread from 3.0 stars to 9.0 stars - but again we see the majority (60%) are at 6.0 - 6.5 stars

Our ten test houses rated on average 6.83 stars under NCC19. When run with the same design and specifications for NCC22 - they rated on average 7.02 stars - an average increase of 0.19 stars. While two designs did drop in rating (by -0.2 stars) - most houses improved by +0.1 stars, with one design jumping +0.6 stars

What does this mean?
NCC22 is likely to be slightly favourable in this climate zone. A rating of 6.8 stars under NCC2019 is likely to achieve 7.0 stars under NCC22