Barn conversion to a 120m2 residential house - What costs are involved?

Yes, it will definitely be exciting. Tomorrow we have our first meeting with an architect. How do architects calculate their fees? I think it depends on the scope of services. For example, we want to assign the interior work ourselves to regional craftsmen.

Keep us updated, I find such projects very exciting. Can you do some work yourselves or will everything be done by others? And what would the overall schedule be? First renovate the main house, move in there, then the barn, and afterward move and rent out the main house? Are you dependent on the rent to be able to afford this?

I was able to sell my own house very well last year. We have been looking for about 1 year and have now found the perfect property for us. We want to renovate the residential house first and move in. Currently, we are renting in our sold house. This way, we can save the rent and are on site. We can only do small tasks ourselves. Such as clearing out, removing wallpaper, painting, and landscaping the garden. We depend on craftsmen. However, I am friends with some of them and am convinced of their work. The time frame would be to move into the residential house within the next 3 months, and after that, we have time.

There is already a lot of discussion here about "normal" construction prices. I believe that with a project like this, the price spread will become even wider.

I agree with that. And also here:

Roughly, you can simply calculate with the costs for a corresponding new build. What is supposed to be a 'very well-preserved' barn? Probably nothing more than walls and a roof. Demolition and new construction would probably be cheaper.

Exterior walls and roof already represent the entire shape of the building from the outside. This often leads to the (wrong) lay perception that structurally this is already "the house," interior walls then provide the design, and one thinks that "more" than energy renovation (and of course the conversion in the case of repurposing) cannot be the effort. In reality, this is not the case: the historic walls only have a charm bonus; in terms of costs, their reinforcement is hardly less than a new build. The roof behaves similarly. One should not infer too much from the basic statement that a conversion is approvable. At first glance, it looks as if the building volume and the location on the property have also been positively negotiated. In the case of boundary development, however, this can certainly mean having to retreat from the outer walls with living / recreational rooms. So the statement should be qualified more closely—in my opinion, best with a preliminary building inquiry.