We also did a lot ourselves...Me + father + brother + occasionally friends...I always carefully filled out all the forms that came. Then I had to pay about 125 euros...these really seemed to count only for the friends...in total, there were several hundred hours of help.
And where exactly do 4 people help, 5 days a week, 8 hours each as self-performed work?
For example, our roof:
Erecting the roof truss took 2 men 2 days at 10 hours each...
The battens and underlay on a Saturday with 4 men at 10 hours each...
The complete ceiling on a Saturday with 4 men at 10 hours each...