New Construction KfW 55 EE: Different opinions between energy consultant and general contractor

I think I still need more posts before I am allowed to send private messages.

But you are allowed to use the search function, for example for: :)

But you are allowed to use the search function, for example at: :)

It took a moment, you have a picture from 18 months ago :) There are also 2 dormers facing the street

Who comes up with such a saw-intensive (or forcing overly wild bonding) wall construction?

In what way do the thicknesses of the stones used indicate the amount of sawing required?

Apart from that, you regularly overestimate this. Drop the mantra. Sawing is totally normal and not a big effort.

[*
Ground slab [LIST] [*]additional insulation under ground slab XPS 100 mm
[*]Exterior walls basement (north, east, south)
[*]Insulation: XPS 160 mm instead of EPS 120 mm
[*]Basement exterior wall (only west) + exterior walls ground floor + upper floor
[*]Aerated concrete 008 instead of 009
[*]Roof
[*]Above-rafter insulation PU 140 mm instead of under-rafter insulation 50 mm glass wool

These are significant changes. But when you see that previously the ground slab was completely uninsulated, except for 6 cm EPS under the screed, not such a big surprise either. The additional costs will be in the five-digit range.

The general contractor now believes that the additional insulation measures are unnecessary and only arise because the energy consultant included the thermal bridges across the board.

That is nonsense. Calculated thermal bridges squeeze out the last bit, but by no means compensate for the massively increased insulation thicknesses here. Moreover, the monolithic construction does not score much better with calculated thermal bridges than one would like.

And that would exactly be the question of whether there is even a Wärmeschutznachweis according to [Gebäudeenergiegesetz], because only the additional effort compared to [Gebäudeenergiegesetz] are the KfW-related costs, everything else are overhead costs and cannot be excluded. If necessary, even if the energy consultant is not authorized to issue a Wärmeschutznachweis, they can also switch their program to [Gebäudeenergiegesetz] and see what is required. [Gebäudeenergiegesetz] is almost the KfW70 standard and [EE] are required anyway; this is also about the difference. If anything, the heat pump would become cheaper because, due to the low heating load, a small system might be needed.

I have also rarely seen such a strange and expensive mix of insulation.
take:
Roof: 2
4cm (alternatively 20+counter battens and 6cm insulation from inside between rafters insulation)

Masonry: instead of 36.5 simply 42 stone - even better 24cm stone + facade insulation
Floor:
under screed your 14cm screed insulation.
done

why should living space be lost at the expense of the builder? apart from that, massive construction in monolithic form is often desired.