> An increase of 5-10% in building cost for better air sealing, a little more insulation (and reducing thermal bridging), and some mechanicals isn't crazy.
Yes but you forgot the part where the vast majority of the world population don't live in a brand new building.
Insulating my not so old house (1998) to be up to the modern norms would cost me something like 50/60k€.
But it is crazy a new home is like 300k just for the house maybe closer to 400-500k for anything decent on the coasts. 30-50k buys a lot of electricity or nat gas.
Yes but you forgot the part where the vast majority of the world population don't live in a brand new building.
Insulating my not so old house (1998) to be up to the modern norms would cost me something like 50/60k€.