Floor plan conversion of part of a barn into a single-family house with the option for a two-family house

But you do realize that converting a barn costs around 3000 €/sqm?

The attic conversion will have to make do with less space than in your sketch. If you want ceiling heights of 2.40 m, it will be even tighter - rather a room width with 2 m standing height of 3.50. I have sketched with a room height of 2.25.

But you do realize that the conversion of a barn costs around 3000 €/sqm?

We are aware that converting a barn involves high costs. However, as mentioned, we will really do the majority ourselves and thus save quite a bit on costs. I know this argument is often viewed critically here, but the conditions in this case are good (equipment, skills, time, etc.) and we have always been able to realize everything in previous construction projects this way. Our architect will therefore actually be involved mainly up to work phase 4, although of course I do not categorically exclude anything beyond that.

The attic conversion will have to make do with less space than in your sketch.

Thank you very much Myrna_Loy for the calculation and visualization! Unfortunately, I had already suspected that. We will take this into account in our considerations and possibly then plan only one large room in the attic.

We are aware that the barn conversion involves high costs. However, as mentioned, we will really do the majority ourselves and thus save quite a bit on costs. I know this argument is often viewed critically here, but the conditions are good in this case (machinery, skills, time, etc.) and we have always been able to realize everything like this in previous construction projects. Therefore, our architect will actually be mainly involved up to service phase 4, although of course I do not categorically exclude anything beyond that.

We also do almost everything ourselves and have the corresponding fleet plus our own wood. But you still won’t get under 300,000 euros. Unless the roof is tiptop and you build to the cheapest standard. But if you say that the half-timbering on the north side is in poor condition, then assume that beams inside will also need to be replaced. If you can and want to preserve beams, you will still not avoid a thermal treatment—unless you want to ignore the invisible risk of progressing woodworm/wood beetle infestation in the converted house. And also, as a DIYer with much craftsmanship in the family, I can only advise: have statically relevant elements done by a specialist company. Especially if you are considering renting it out. You are bound by the Energy Saving Ordinance. You have to expect massive amounts of material. And that with the current building material prices. Get good advice on this.

All right, thanks Myrna_Loy! I take from this that we will first engage in an intensive consultation with our architect to develop a "battle plan" and put the floor plan on hold. After we have done this, I will turn to the forum again and, of course, share the insights with you. Please excuse us for having to backtrack properly now and leaving you a bit in the air here, but this seems to be the best way. I will get in touch as soon as I know more :)