Construction costs are currently skyrocketing

The work output of a company with, say, 2 installers takes about 1 day. That makes 20 working hours.
Let's calculate with a high hourly wage of €100 per installer hour. That amounts to €2000 labor cost.

So we come to €7000. If we calculate an additional 20 percent risk and profit, we would be at €8400. If we add an inflation surcharge and €1000 extra profit for the entrepreneur, we would be at €10,000. The entrepreneur would have a gross profit of more than €5000 on such an installation. But no, that is not enough. It has to be €15,000 per day.

If such high profit margins are that easy to achieve, why don't you open a business that installs turnkey solar systems? One solar system (2 days of work) per month is enough for a decent income :)

Or an offer for the complete exterior plastering. €20,000 with everything.
Material costs €5,000. That leaves €15,000 for labor costs, plaster machine, and scaffolding. 2 people plaster the house in 1 week.
So 80 working hours at €65 each. So €5,200. Again €10,000 that no one can explain.

Or the foundation slab. Specifically, one cubic meter of concrete costs €90. If we take 20 m³ of concrete that is €1,800 concrete. Maybe another €1,000 for rebar, €500 for KG pipe. How many hours does it take for 4 people? 4-5 hours. Still costs €20,000.

Be glad that you are not a craftsman or construction entrepreneur. With zero understanding of a (full) cost calculation, your company would probably have gone under before you really got started.

Leaving aside the fact that the calculation does not add up at all, one should assume that overhead costs are included in the €100 hourly rate. I hardly believe that an employed craftsman or construction worker has this hourly rate including additional costs.

So I am a craftsman myself and have built most of my house by myself. Of course without a loan, only from savings, ongoing income, and a lot of personal effort.

Now a solar system is due. Nothing special. 7.2 heat pump capacity, with storage and inverter. Got a quote. Should cost 31,000 euros. I don’t know what’s going on with the company, but somehow that’s really cheeky.

Now I’m just building it myself. I have the scaffolding, ordered rails and roof hooks, module hooks and modules. All already installed. Costs so far about 3,200 euros. Now still the inverter, the storage, and the electrician.

Will end up somewhere around 9 - 10 thousand euros in total.

The difference between a quote and the actual effort is just too big.

By the way, this also applies to various quotes and construction costs for house building in general.

That interests me a lot, I am also about to just do it myself with photovoltaics. Will there be a diary about it?

No, no diary. I don’t have that much time now.

It might not be so easy, but I think it will work.

So, I cut out the bricks and installed the matching roof hooks on the roof. Then I screwed Schletter mounting rails onto the roof hooks, and on top of that the solar modules. 18 modules Trina Vertex Black with 400 heat pump power each. In total that is 7.2 heat pump. By the way, the module price was 148 euros per module including delivery by freight forwarding.

Now I have to lay the ground cable from the inverter to the meter cabinet and the string cables to the inverter. Then I have to see which storage systems are suitable. Probably the Pylontech storage 48V and based on that the appropriate inverter.

However, first comes the search for a suitable electrician who can also connect it for me. After coordination with him, it will continue.
In any case, it’s no rocket science. It is also supposed to be just the beginning. The system will certainly be expanded later.