House without garage and basement? Attic expansion? Lipoma?

We have thought the following,

if we want to build without a basement and without a garage and preferably with a carport, does it make sense and what would it cost approximately if we instead convert the attic?

We would place a building structure of about 10.50 meters x 8.50 meters along the street. On top, a gable roof with a 45-degree pitch (alternatively: only 40-degree pitch) and the knee wall on the 1st floor should be about 1.40 meters high. At the peak, you would then get around 2.80 meters.

Instead of insulating the top floor ceiling, we would have the roof insulated. The top floor ceiling should remain a wooden beam construction for cost reasons (I think, right?). The attic would be an unheated ancillary room but equipped with at least one ventilation opening.

The stairs up should also be reasonably comfortable. What does a normal living space staircase cost? Possibly we would simply extend the living space staircase into the attic if it does not cost too much?

In the medium term, a wood-metal design carport for 2 cars next to the house with bicycle stands in the rear area (in my opinion 100x better than such a garage block made of concrete and steel). The bikes would thus be weather-protected but quickly accessible. Necessary garden tools will be stored in the utility room; unnecessary junk as well as seasonal items, heirlooms, etc. will go into the attic (within the thermal envelope and ventilated via controlled residential ventilation). Likewise, winter storage of garden chairs I would do in the attic; in summer, of course, they would simply remain outside permanently.

It is questionable whether and which technology could be stored in the utility room (ground or air heat pump, controlled residential ventilation, warm water hygiene storage, ...).

It is also questionable how much such a conversion (planned directly from the start and carried out by the general contractor) would cost compared to the standard variant (insulation of the top floor ceiling, insulated pull-down stairs to the cold attic space)?

Why are you so resistant to advice?

I am not, quite the opposite. I am happy about all hints, tips, and experiences regarding the above topic. Surely I am also not the first to plan something like described above.

But why don’t you go to someone who can plan?

You are approaching this completely wrong – you go from here to there and change this, then fundamentally change that again. But in the end, you don’t get any further and don’t take any advice...

Again: Why don’t you go to a planner and then post those drafts? In the [grünen Forum] – no matter what people might think about some there – you don’t get such a devastating response without reason.

You certainly can do a lot with numbers, but somehow planning a house isn’t your thing. It’s a pity for the time – how long do you want to keep dealing with it?

First find a model that roughly makes sense and then I can annoy the GÜ. The GÜ will surely ask me whether I want a gable roof or hip roof, 2 full floors or not. Whether with or without a converted attic, etc. – I could then just tell him, yes please calculate all 322 variants and give me the prices, I have no idea what makes sense. It ALWAYS depends on the price/performance ratio. Instead, for such still vague preliminaries, there are internet forums.

And when I roughly know which direction it’s going, then I can have 3-4 variants calculated instead of 322 variants. In the end I would never blindly trust a GÜ, after all he also thinks about his own profit.

Just visit a few model home parks. That will definitely provide enough input.