Cost planning - core renovation of farmhouse / country house

Even historic preservation would not be an absolute exclusion criterion for me

What exactly that means unfortunately depends greatly on the person of the respective responsible party.

As already wrote, I would not only look for a farmstead in the outskirts, but be completely open to other properties with thick exterior walls as condominiums. Old schools, old clinics, factory buildings, anything that has brick walls about 1 meter thick, and then a corner apartment. You also save on air conditioning; our old school building never gave us a heat day off.

Old schools, old clinics, factory buildings, everything that has brick walls about 1m thick, and then a corner apartment. You also save on air conditioning, our old school building never gave us a heat day off

Hehe, in my elementary school there was still a heat day off back then: the measurements were taken in the new building's office ;-)

Very interesting topic. Basically, as an occupant of a renovated old building (ground floor built early 18xx, extension 1st floor + attic 193x), I can only say this: If you are not pain-resistant and able to endure suffering, don’t do it. I mostly organized the renovation here myself 10-15 years ago because without the housing allowance it would have hardly been possible. Work done: - New roof (battens + insulation + insulation above the roof) - Ground floor underfloor heating (there was only gravel and Sollenhofen lime) - 1st floor floors removed, subfloors renewed, battens, 5cm OSB, uniform room height - new windows - new heating system (including pipes throughout the house) - partial electrical renewal - new bathroom - all walls new In total, around 120k euros were invested for approximately 120sqm of living space during that time. Partial renovation - mostly completed 10 years ago. Everything was unpredictable because holes appeared everywhere, beams were missing, walls were crooked, etc. So today it would definitely be 200k for the same work. Result: It is still old. Recently the shower leaked because the ceiling had settled. Damage 6 thousand euros. Soon the following should also be done: - completely remove the crooked floor in the attic because it springs. - renew the rest of the electrical system. - the staircase to the 1st floor is rotten and needs to be replaced. and many more small construction sites. For noise-sensitive people, this place would also be completely unsuitable. Despite thick walls and new windows. In the 1st floor bedroom, the heating pipes crack as soon as the heating turns on early at 4:30 a.m. In the living room you can clearly hear the heating running. The doors are loud when opening and closing. etc. Underfloor heating everywhere, as you want it, was excluded by the planner back then for the 1st floor and attic because the ceilings wouldn’t have supported it; it was only realized in the bathroom with additional beams. The option at that time would have been to completely remove all ceiling beams and pour concrete ceilings. But that would have been in the 100k range for the entire house. I also see the catch hidden in your plans. Regardless of the property, you would need a truly experienced planner before purchase who inspects everything on site, sometimes opening ceilings, to be able to tell you whether what you want is even feasible. We live very rurally here, there are many farms, hamlets, small villages with huge plots at the edge of town. We have taken in many city dwellers fleeing the city in our landscape protection area and all faced these problems with permits, renovations, etc. If they didn’t fail because of that, the rest failed because of the supposed rural idyll. The owl that hoots all night and you can’t legally ban it. The farmer who simply cultivates his fields around the main farm, an outrage that he also does that in the middle of the night in summer. Harvest time should be forbidden! In spring and autumn, land is plowed and harrowed; the newcomer doesn’t understand why the farmer does this because he bought peace and fresh country air. Forestry takes place in the nearby forest. Chainsaws, machines, etc. The village youth have their trailer 800m away in the forest. That young people also want to have fun in the countryside and there are not so many pubs and discos here may have escaped the newcomer. After the 4th police operation at the trailer, he is no longer the newcomer but the outcast who is notorious in the village. The neighbors (2 km away) keep chickens, pigs, and cows - they tried everything, but neither good-natured reasoning nor the threat of a (temporary) injunction could prevent the noises that you can still hear 3 km away in the country. Country is not peace, just different noises! Ergo: Isolation, where no one bothers you, for me as a country bumpkin starts at 3-4 km without neighbors in all directions. Something like that was even offered to buy here recently. Residential house in a river valley, hiking region, landscape protection, FFH, x00,000 sqm of land (the whole valley including slopes 3 km upstream and downstream), fishing rights. The sale fails as far as I know because you are basically not allowed to live there. So no renovation, etc. either.

I continue:
Cows with bells, which have always been there, but bother the Düsseldorf native who now lives in Miesbach ("So picturesque, huh!") so much that he takes it to court.
The rooster that persistently crows already at 5 a.m. in summer.
The frogs whose love songs become quite loud on summer nights.
The woman who buys the old parsonage and then is bothered by the ringing of the bells (which really wasn’t to be expected next to the church!) and demands that it be stopped and then wonders why she is no longer liked in the village.

I live very rurally and it is sometimes quite noisy. And that in an annually recurring rhythm.

You live in a new development, everyone still has a lot to work on. I think it will be noticeably quieter in a year or two. Also due to planting that grows.
The rural noise cycle will always remain the same.

Well, those are already extreme concentrations. Agriculture is really always present, and what is still missing is hunting. If you hunt wild boar at night exactly on the border 301m away from the nearest building, because farmer's beets and potatoes should remain the farmer's as well, that is also noisy.