That is very exciting!
I would definitely insulate under the slab. It won't cost much more and the passive house standard does call for it.
Another area that passive house is super critical on is air sealing. Thats arguably more important than the amount of insulation in areas. This should be key. Since the house will be sealed up so well, you'll also be needing an HRV or ERV.
Please keep us updated with how things go and share the design work too!
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