Experiences with KFW 40+ or Passive House Monolithic Solid House

Hey dear forum, I wanted to ask about your experiences with building a Kfw 40+ or passive house using monolithic solid construction. Most people told us they work with an insulation composite system to achieve Kfw 40+. Can you recommend companies that achieve monolithic Kfw40+ or even passive house? How much higher is the price compared to stone + insulation composite system? The last question: can you actually notice a difference in indoor climate between monolithic and stone + insulation composite system? Unfortunately, I found few reports on this in the forum and hope there are some here who can help me :) Best regards, Saldier

That the topic "KfW40 what it costs and whether it brings more" is discussed too rarely here, I cannot confirm. How is the question about "experiences" meant? - I have indeed heard of one case where a housing company built several essentially identical multi-family houses, standing next to each other and thus cleanly comparable, only one of which was built to the KfW40 standard. But the discussants here? - these are people who only build according to the Energy Saving Ordinance or KfW x or KfW y or Passive House! And what they can report is posted here, dozens of times: their offer prices with wall A or with wall B (one-dimensional comparison at KfW55) or in combination wall A and heating gamma, wall B and heating delta and controlled residential ventilation (no longer separable multidimensional comparison between KfW x, y or Passive House).