[pjerem]

> 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€.

[throw0101c]

> Insulating my not so old house (1998) to be up to the modern norms would cost me something like 50/60k€.

I grew up in a house built in ~1898. I know about old houses. There was still some piping in it for gas lighting (before electricity was "invented").

[hd95489]

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.