So we are getting the energy-plus house for €210,000 (€1750/m²) fixed price (Energy Saving Ordinance reference house offer would be €160,000 so about 30% less). Rough data: 120 m², timber frame construction, 10 kWp photovoltaic, - NO polystyrene on the walls, no heating but a fireplace, no heat pump, central controlled residential ventilation with heat recovery and geothermal exchanger, box windows, ...
When all the subsidies come in, I reduce the rate by about €100 per month, and since I also use €100 less electricity per month and €50–80 less gas/oil, I have about €300 more that I can put into the loan installment. At an interest rate of 1.5% that we have, this means we can borrow €80,000 more and the "warm rent" is just as high as for an Energy Saving Ordinance 2014 reference house.
So in our case, this means that although I have additional investments of about 30% (€60,000), I actually have a slightly lower monthly burden thanks to the lower interest rate and the savings on ancillary costs.
That I will also get money from the electricity feed-in, because I certainly will not consume 9,000 kWh per year and energy prices will also rise, has not yet been taken into account.