We have drawn what house plan we like. Will a draftsman know about house orientation/heating and cooling suggestions? Or is there another profession that we need to ask?
Read the Aust government article. https://www.yourhome.gov.au/passive-design
A residential draftsman needs to know about design, orientation, etc. They go broke if they don't as their plans will not be approved without meeting thermal performance requirements. Times have changed, we can't just knock up a plan and submit to council without providing evidence of it performance. No one wants to submit to council and not get approvals.
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PASSIVE SOLAR DESIGN you can go full tilt into ever single element like a total purest or pick the vital parts: knowing you sites micro-climate, orientation, thermal mass, insulation, zoning etc. Gather the best information you can and work with that. any help: The plan is my baby!! Cheers Margot
As dreamer says, educate yourself, by reading the government's 'Your Home' website. An invaluable resource.
I'd recommend reading it all, but start with the passive design section. Here's the page on orientation.