Blower-Door-Test necessary for controlled residential ventilation funding

Hello everyone,
for our controlled residential ventilation we will receive a subsidy of 1 kEUR if we meet some requirements. One of them is a blower door test.
Since we are not building a house with KfW standard, we basically do not have to do a blower door test.

That means for a subsidy of 1000 EUR we have to invest a few hundred EUR in a test.

Are there any tips on how to get the blower door test as cheaply as possible? Recommendation for an inexpensive provider?
Our house is located in the area around Erkelenz.

Doesn't help you directly now, but if it concerns a new building and your ventilation system is considered in the energy saving ordinance certificate, then the BlowerDoor test (regardless of KfW) is mandatory.

I need to check that, unfortunately I do not have the documents at hand right now. I suspect that this was not taken into account, otherwise we would have to do the test.
[Neubau] - correct.

Energy performance certificate was calculated with window ventilation, I just checked. At the time of creation, we were not yet 100% sure whether the [Kontrollierte-Wohnraumlüftung] would be installed.