Construction costs are currently skyrocketing

Are you talking about trade tax or property tax now? Or are you just mixing everything up?

He follows the approach of a footballer: “…The main thing is Italy!“

Something new again about the current prices for a renovation

Roof renovation approx. 120 sqm floor area and 155 sqm roof area:
With insulation of the top floor ceiling approx. 56k
With overlay rafter insulation approx. 61k
Both offers completely including metalwork, scaffolding, new folding staircase and with Brass Tumalin tiles

Replacement of approx. 13 windows, brand Guggelfuss, including one balcony door, one large window approx. 3m wide and 5 basement windows including aluminum roller shutters, exterior boxes, insect screens and motor approx. 31k. Roller shutters everywhere except on 3 basement windows
Front door two-tone Schüco, aluminum with large glass surface 5.3k
Front door two-tone Schüco with large glass side panel (1.60m), also aluminum, just under 9.5k
All triple-glazed

The prices are already insane. I can't keep up with that and would have my problems with it.

Recently, I got a quote for 10 windows from an online window supplier.

10 windows in various sizes, 3 balcony doors included, of course only double-glazed in plastic. Including shipping costs and discounts 3000 euros. On average, the windows are 1.00 x 1.40 m. That is a good price. I will install them myself. Maybe another 200 euros for installation materials will come up.

At a building materials dealer without discount, the Braas tiles cost 3.70. The cost of the tiles is 6308 euros gross. On top of that, battens, counter battens, metal sheets, nails, screws, etc. Also insulation for the ceiling. So I would assume the material cost for the roof is under 10,000 euros in equity for the business. How do I get to 56,000 euros for a new roof? 46,000 euros labor costs.

Even if 4 roofer journeymen put on the new roof in 1 week, that adds up to 200 working hours. These are no longer serious offers at all. Surely, the company wants and has to cover its costs and make a profit. Then they probably charge 100 euros per hour for a helper. Usually, 20 percent was calculated for profit and risk before. Today it's more like 200 percent.

The roof should not cost more than 25k and the windows are also way too expensive.

But that's just my humble opinion.

Something new again about the current prices for a renovation

Roof renovation approx. 120 sqm floor area and 155 sqm roof area:
With insulation of the top floor ceiling approx. 56k
With counter-rafter insulation approx. 61k
Both offers complete with plumbing work, scaffolding, new folding stairs and with Brass

For comparison. New build, passive house. Roof areas 180 sqm, with 160mm above-roof insulation WLG024. Creaton tiles. Including all other preparatory work and drainage. €42,000 gross. Plus another €6,000 for the insulation between rafters, which is supplied and installed by the carpenter. Scaffolding excluded, as contracted separately. But it is also used by other trades

Even if 4 roofer journeymen re-roof the roof in 1 week, I come to 200 working hours. These are no longer serious offers at all. Of course, the company wants and has to cover its costs and make a profit. Then they probably charge 100 euros per hour for a student assistant. Usually, 20 percent was calculated for profit and risk in the past. Today it is more like 200 percent.

Since you unfortunately only listed half of the necessary materials, the entire calculation doesn’t fit. Aside from that, if you look into the financial statements of construction companies/tradesmen (I don’t know the small one-man businesses, only the larger ones), you can sit for weeks beforehand and look for the 200% profit. You simply won’t find it. But yes, it is more than 20%.

Well, I am a craftsman master myself and have practically learned how to calculate an hourly billing rate from the ground up.

How you arrive at a billing rate of 120 euros for an unskilled worker, who perhaps earns 18 euros gross at best, is a mystery to me. Certainly a bit exaggerated but basically often the reality again.

As long as the customers pay, there is said to be a fool standing every day (you just have to find him), as long as that is the case, everything is fine.
Let's see how much longer.

The day before yesterday I ordered [Silikat außenputz]. Ready mixed and 3mm grain size. The price per kilo has risen from 1.58 in 2020 to 2.05 today. So that's still somewhat reasonable. Now the 25 kilo bucket costs 11.75 euros more.