Or the demands have to be scaled down again. You can also live well with 1 to 2 kids on 110 sqm without controlled residential ventilation and KNX. Or even with 80 to 90 and an extension reserve in the roof.
Maybe you just have to contribute a bit more of your own work again.
Even though I basically agree with you, building a house today without ventilation with heat recovery is utter nonsense. Even an EH70 has a great building envelope, and then we open the windows and let the valuable heat out. Not to mention that most people ventilate far too little anyway.
Also, reducing square meters doesn’t bring much anymore in a 1.5- or 2-story house after a while. You still have the walking distances, stairs, technical room. Whether you now have 130 or 110 sqm. Somewhere around ~120 sqm I no longer see a reasonable ratio if you build smaller.
PS: cheap construction still seems to be in demand. This week I talked to a neighbor who is currently doing the earthworks himself with a mini excavator (!). They ordered a Danwood. The building application was submitted to the municipal council in mid-November (2021), planned move-in date is calendar weeks 7-9 in 2023...