Building usable area and annual primary energy demand (KfW55)

Hello,

Today we received from the expert the "confirmation for the application (BZA)" for the KFW program 153 (Energy Efficient Building). Two things caught my attention, for which I would be grateful for your professional opinion before we sign it and submit it to the bank.

Briefly about the framework data of the planned house:
New construction solid house with exterior walls made of 36.5 porous concrete
Ground floor and developed attic, the loft is outside the insulated building envelope according to the design drawing (see attachment)
Heat generation with air-water heat pump (Rotex)
Net floor area: 141.05 sqm
Living area: 126.26 sqm
Built volume according to DIN 277: 541.691 cmb

The questions:
The expert determined an annual primary energy demand of 35.3 kWh/m²a. Could that be correct?

More important for me:
He calculated a usable building area of 172.1 m². Could that be correct without including the unheated loft? I seem to have read here that the loft is often included to improve the KfW figure.

Thank you very much!!!

Marko

@ Marko

Regarding 1: yes
Regarding 2: yes

You should not think or believe; that is the job of priests/pastors. SCNR :-)

And where does your distrust come from anyway?

Construction expert on the go

: Thank you very much for the answer. This is not meant to be distrust, just overly cautious. ;)

@ Marko

Regarding 1: yes
Regarding 2: yes

You should not think or believe; that’s what pastors/clergy are responsible for. SCNR :-)

And where does your distrust come from anyway?


Bauexperte on the go