If you are a builder that executes these details on every project, the cost impact is manageable. When you consider that houses are largely financed and also have operating costs that are dependent on energy efficiency, better built homes make sense on a cash flow basis.

However, the real estate industry does not properly value energy efficient projects, and most builders don't execute these details often, so they end up costing more than they should.

Another article from Fine Homebuilding goes over some of these issues: https://www.finehomebuilding.com/project-guides/insulation/d...

Here (France, and my original country, Italy) costs are complicated to judge: in mere raw materials the cost is far lower for new wood frame houses, but in term of final price is significantly higher, partially because they are a relatively new concept in south/central EU and partially because most enterprise are small ones who do not work much in "modern" terms than in their own workers experience and so they need external enterprises to design and test stuff like windows design for passive heating from the Sun, how much cover windows for avoid Sun when climate is hot, how to design low-inertia heating with heat pumps, Canadian well, dimension a solar p.v./aerovoltaic/* systems etc and while those systems are technologically simple they are sold at higher prices for what they are for similar reasons.

The lack of mean awareness and expectations probably permit high prices. In cost terms what I can say is essentially: more initial capex, far reduced opex IF anything is well done. Seen inflation capex/opex ratio means reduced TCO if you buy to stay for years and years at least, resale value so far is a bit crazy for the already described reasons...

there's another article on that site where she talks about price - it costs her 320k but keep in mind that didn't include the land, her blue prints or all the sweat equity she point in.