@mathiasx I’m into those things and am currently working on my house too. Been through a lot of planning and compromise. Have done a complete 180 from my initial plans and what started small, has ended up being a giant multigenerational house. Radon isn’t hard to mitigate if you plan for it. We’re doing ICF(Fox Blocks) and for years I thought they were too expensive. When I factored ALL the costs in and saw my friend build one, I was sold.