Hello,
Building regulations are sometimes a bit strange. It can also depend on the position on the property where you want to build your carport.
We need to designate two parking spaces on the property, which are directly in the driveway at our place. If we want to have a carport over them, we need a building permit. But if we build a carport directly next to the house, it is exempt from approval because it is legally considered a third parking space.
You don't have to understand it...
Best regards,
Andreas