KfW55 EE house with 42.5 Poroton: planned too tight?

And were any KfW subsidies claimed? I was just advised at the KfW hotline to build "with support" and a final inspection by an energy consultant. The energy consultant is also involved in the "confirmation after completion," through which you first qualify for the generous repayment subsidy.

And in addition, there are supposed to be random checks by KfW. If it turns out that KfW55 is barely missed, you have to pay everything back.

Yes, KfW55. The energy consultant calculated what insulation needs to go under the floor slab, what goes into the roof... The energy consultant was on the construction site six times and checked whether everything was built as stated in the KfW application.
In the end, a blower door test was conducted.

I don’t understand what should come out differently at a final inspection than before. The whole process works solely based on these invoices.
And as someone already wrote, you can also slightly increase the insulation; that is always cheaper than the other brick.

The windows are planned as "triple glazing Ug 0.6", the gable roof has "24cm insulation WLG035". Sounds pretty good.

That’s what we have. Strange that kfw55 is so tight for you.

That's what it says for us. Strange that kfw55 is so tight for you.

I also wonder why it is so tight for us. I will call the energy consultant and ask which values he calculated with and where the weak point might be. Could it be that the floor slab is perhaps not insulated?

A similar thread from six weeks ago is here:

I’m also wondering why it’s so tight for us. I will call the energy consultant and ask which values he calculated with and where the weak point might be. Could it be that perhaps the ground slab is not insulated?

Here is the construction service description for our ground slab, so you have an example.

Here is the construction performance description for our floor slab, so you have an example.

And here is the planning for my floor slab. 12cm after all!