ᐅ How many square meters can you get for a turnkey KfW40 house with a €150,000 budget?

Knallkörper schrieb:
There is definitely more poor workmanship by DIYers than by professionals.

That is your opinion, which you can no more prove than I can prove mine:

My opinion is that a homeowner tends to do many tasks on their own construction site much more carefully than a contractor under time pressure.
For example: insulation of the floor beneath the underfloor heating. The meticulous way we installed the insulation around the pipes is something a contractor simply cannot afford. We spent two weeks on it. And no one can convince me that a trainee/helper at a plumbing company can achieve the same quality in two days...

The same applies to the insulation between the rafters using mineral wool.

Both insulation layers (floor insulation and mineral wool) are quickly covered with a membrane or vapor retarder, and no one can see any sloppy work afterward. For such tasks, I would never pay anyone who doesn’t do it properly.

How do I arrive at this assumption, which I cannot prove? Four friends and family members work at different companies and have told me how these jobs are carried out when done by them and who usually does this work (trainees, etc.).
Certainly, not all companies work this way, but nowadays this is certainly not uncommon!

You can recognize a good craftsman by the fact that he works quickly and neatly.
Why don’t you just do everything yourself... have you ever wondered how a workshop can change 4 tires for 20€?
You have to have a bit of basic trust in craftsmanship. Just as I do my work properly, I assume that a craftsman delivers his work according to the current state of the art.

Egon12 schrieb:
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You have to have a basic trust in the trades; just as I do my work properly, I assume a craftsman delivers his work according to current technical standards.

I would see it exactly the opposite: A basic mistrust should always be the starting point....... Anyone who has actually built something knows what I mean.....

You should NEVER assume that the work will be done properly. If it is, great. If not, you’re glad to have identified it early enough (through inspections!). I have often read here: “Well, that’s just the way it is.” That kind of acceptance must be reduced to an absolute minimum. It is demanding, but sustainable (by that I mean on-site inspections). Apparently, there is no other way.

readytorumble schrieb:
But we also needed two weeks for that. And no one can convince me that an apprentice or helper from a plumbing company can deliver the same quality in two days...

Again, a poor comparison. Who does "we" mean? Two people? Then the plumber alone would have one week, not two days, if we’re being objective. I’m sure a skilled worker could even finish it in one day. When I was a student, I spent a whole summer laying insulation in a screed company. A single-family house can be completed by a three-person crew by lunchtime. And precisely so. As a beginner, you need five times as long because you constantly misjudge the curves and spacing!

readytorumble schrieb:
Over both the insulation (floor insulation and mineral wool), a foil or vapor retarder is quickly installed, and no one can see any sloppy work anymore.

If the contractor realizes they can fully cheat the client, they might sometimes do so. That’s why inspections exist.

I experienced this with our carport, while my neighbor is the opposite example.
For my project, two craftsmen came; during the first visit, they poured four concrete pad footings, working for 4 hours. They had to remove the existing paving stones and reinstall them, cut to fit afterwards. I believe there are a total of 12 footings.
At the second appointment, they assembled the carport from 8:00 a.m. to 12:00 p.m. The good thing is that I have a warranty, but I don’t think the carport will collapse.

My neighbor is building on his own… for now five weekends.

During that time, I mow my lawn, go for walks with my child, and visit the grandmothers.

Wow... The topic shifts from the original question to the topic of self-performance so quickly.