Is this a concrete carport? Or wood/aluminum?

Here is a simplified plan of the property and house For suggestions, I am grateful

Here is still a picture of the house P.s I find the red bricks unbearable, but unfortunately they were prescribed afterwards

And you want to cover the entire front yard with the carport now? I would reconsider that. I rather see a single carport in the north with a covered access to the front door. For the granny flat, a parking space in the yard or in the east... I would also talk to a carpenter who builds in clad timber frame construction.

This is roughly how I imagine it

A double carport is a must, since we have two cars
What is the difference compared to a single carport with a roof leading to the house?

Extending the carport roof all the way to the front as a canopy for the granny flat would maybe be nice. But I don't know if that's possible because of clearance distances, etc. It also depends on the additional costs...

On-site production can also be called construction site fabrication: that is, shuttered / welded / carpentered on site. The lump from the example image I would probably cobble together with concrete, aerated concrete, steel beams, square tubes, and drywall cladding – before plastering it would look like it was put together by Dr. Frankenstein, I subtly described it as "heterogeneous".

A carpenter can also do that, with columns for example made of beams wrapped in drywall (the cross-section including plaster could end up under 30 cm). However, the floor connection of these columns would be "non-trivial". As I said, ask Massa Haus how they do it in reality – that surely can be done in a less bulky way.

However, consider: the carport in the example image you used fits the budget more with the cars underneath than with the house. At that price, you can connect your whirlpool to the heating, and even gild the range hood.

I would definitely not want to cover the space where the yellow S60 (?) stands in your picture with such a carport: the poor tenant also needs light in the bathroom and kitchen in the morning, even in summer, and visually the main entrance becomes a side entrance, if only because of its "hidden" location.

So I agree with Yvonne’s suggestion and would leave the parking space closer to the house of your two, as well as the tenant’s, uncovered.

However, keep in mind: the carport in the example image you used fits the budget more for the cars underneath than for the house.

Um, what is that supposed to mean now?
I didn’t say which cars will be parked underneath...? At least at the beginning there will be a Ford S-Max and a small car but does that even matter?!?

And I have no idea about the budget. In the size range of a double garage?
I know that my example picture is from Massa Haus. It’s not really in the category “exclusive” or “high quality” for me.
But that doesn’t matter. It was about that plastered look.

the poor tenant also needs light in the bathroom and kitchen in the mornings even during summer,

The kitchen of the tenant apartment faces east/south. The bedroom and bathroom are on the north side.
Yeah, light would be nice here but it’s also okay without. In my current bedroom we hardly ever open the blinds and our bathroom has no window at all...

I would put the space where in your picture the yellow S60 (?) is

Sorry, my artistic talent is abysmal...
Green is supposed to roughly represent the area where the carport is to go and the black scribbles are car and path to the front door.

So you guys would put a single carport on the boundary and just a parking space between carport and house?

I find that really difficult. I don’t want to have to move the house unnecessarily far from the north/east boundaries just because of carport/parking and then give up south/west garden.