That would be construction costs of €935/sqm without the basement. Without knowing the building specification now, I would assume quite a bit will be added through the customization. SH may not be among the most expensive building areas, but coming in under €1300 per sqm feels quite ambitious without a lot of equity. Do you want underfloor heating? And is it included? Bathroom fittings above the standard of the construction company, exterior paving, a nicer front door, a few more sockets.
Since it is not apparent from the text and is often forgotten at first: Have you thought about the incidental costs? Things like kitchen, surveying costs, painting costs
Regarding "Team Massivhaus": The building specification reads not bad. The equipment is not luxury but looks sufficient to me.
Regarding Leonwood – yes, certainly a bit more will be added on top. I will get an offer when I’m next in SH. These were all just estimates. Apparently, not even doors and windows are included in the price. So I will calculate another €25,000 on top.
I have partly thought about the incidental costs, yes. I have not yet calculated the kitchen. I estimate it at €8,000 - €10,000. Surveying costs hopefully won’t exceed €1,000. We would do the exterior paving ourselves. The garden is already very nice.
Painting costs will be limited, as we will paint ourselves (with good paint), of course.
I can theoretically do without underfloor heating. It would be nice, though, but that would certainly add another €10,000 for new construction and a lot more for renovations, right? An electric underfloor heating system is basically out of the question due to the high running costs.