A carport would be a big compromise.
Really? We have 6x9 including a storage room and I find that comfortable. You can insure a roof tent theft or make it more difficult with simple measures, but you can’t prevent anything like that.
For me, the intended room heights INSIDE the house of 240 or 250 cm would be an unacceptable compromise or condition. You are already thinking about an imaginary motorhome with special extra space requirements in addition to the garage construction due to the roof tent, but you’re content INSIDE the house with minimum dimensions, and possibly don’t want to “afford” controlled residential ventilation. That wouldn’t be my approach.
One possibility that occurred to us was a single garage with an adjacent carport. How much cost saving that would be, and whether that would then be worthwhile, of course remains the question.
If it’s going to be masonry, I’d have it fully masonry right away; otherwise, it’s neither fish nor fowl. Of course, you can even buy a used prefab garage for little money, or two, clad them yourself with inexpensive wood to look modern, and it already looks fancy. But then you still have two small concrete boxes and nothing for a roof tent, motorhome, and whatever else comes along. A carport is more flexible but depending on the motorhome’s height, it can get tight; it’s also a question of how something like that would look.
As I see it, the own motorhome will still take several winters, which is not bad, especially if you’re building a nice new house right now. Everything in its time... first, it’s probably the following:
Terrace mainly in the southwest to also get evening sun. This will later be covered with a pergola.
A 3m lift-and-slide door would be my dream
They used to be jewels. Times change; I’m getting old / I am old.
I understand that large glass surfaces are beautiful, even bigger is fine, but much more important to me would be, for example, comfortable shading with a venetian blind and a simply functioning patio door and generous fixed glass surfaces. At the old house, we actually had a really huge sliding door; but we always used the patio door next to it; so I wouldn’t hang my “dreams” too high just to be disappointed for no reason when that doesn’t exist – for good reason – but it gives me flexibility elsewhere.
In the back of my mind would always be truly meaningful controlled residential ventilation or significantly better insulation for my residential building.
I think such details will “fall into place” in due course for the builders as the planning progresses. We have gradually abandoned many things that were thought to be wishes or must-haves for pragmatic or the above reasons and still got a nice house.