Renovation of a 1960s house: Questionable expert recommendations?

There is little new: Our preferred general contractor received the planning contract and will send a partner in early November to take measurements. Then the planning will slowly begin. In advance, he didn’t want to be tempted further and named 200-300k. Great. At least he doesn’t immediately go over the sound barrier of 300k, which represents the absolute top limit for us.
As a comparison, we had another company on site. The managing director himself showed up, then stood in the yard with gelled hair and company logo shirt (sorry, stereotypes, but confirmed here) and asked me about the budget. I then mentioned the originally hoped 250k and quickly added that we knew about the current market situation. He hadn’t seen the house yet and immediately waved it off; his customers usually know what they’re getting into with a renovation. Absolute bottom line: 350k. Plus a coward surcharge of 20k + plastering the garage + complete kitchen + ...
Just for the roof renovation (insulation above rafters, raising the eaves, re-roofing, ...) he estimated at least 75k. The roofer who came the next day laughed himself silly. Under 50k should be doable.
He then started whining that he currently brings money to every construction site and that things are incredibly hard for him. I then pointed to his S6 in the driveway and said that things can’t be going that badly. But he leases it "very cheaply for only 800 €/month."
I am well aware that the 300k figure can also come down. We will just make concessions here and there or have to quietly get rid of older relatives, but this guy’s attitude was really something else. Simply 25% above the competition, and that without having seen anything.
In the meantime, we had a water damage that was noticed by chance. After two weeks of vacation, I was back in the house and suddenly standing in a puddle in the kitchen. Due to a burst pipe, the main water line in town was turned off and then turned back on. Presumably, the pressure surge opened the cold water valve of the kitchen unit, which then dripped away nicely for days. Several liters ran into the floor. So far, however, nothing has reached the cellar...
Over the weekend, we will start removing the wooden floors and shoveling out the sand filling. At least there is no rush...

Ugh, no one really needs entrepreneurs like that. And I estimate that 300,000 will be more than enough if it’s not going to be a palace with golden floors. Why do you want to take the filling out of the floors? Old fillings are better in terms of vibration and sound insulation than some new insulation material.

Awarding a contract without first making a [Bauleistungsbeschreibung] and fixed price... you either have great trust or are careless. Please continue to report on how it goes.

Awarding the contract without first creating a scope of work and fixed price... you either have great trust or are reckless.

But please keep reporting on how it goes

I believe that the planning contract does not necessarily mean that he has already commissioned the complete implementation. Here with us, it is currently the case that planning itself already costs money and the creation of an offer. But maybe I misunderstood.

Ask our next chancellor. I'm glad to have switched to a heat pump and photovoltaics.

I heard the electricity price is now supposed to rise to 50 cents … I'm no longer glad to have switched to a heat pump …

I heard the electricity price is now supposed to rise to 50 cents

Are you aware of what's currently happening with gas, oil, and coal? And unlike fossil fuel heating systems, with a heat pump you can very easily produce the "fuel" yourself.