Unpredictability of construction costs - Will the project fail because of it?

In our conversation yesterday regarding the price increase, he casually said that there is no contract yet and therefore the prices can still be adjusted. Well, if that’s the case, we can just terminate the non-existent contract and that’s that. I will inform him of this today and if he reacts rudely again, I will proceed with a lawyer.

Hello!

First of all: I don't see any major mistakes with you! I also don't understand why a construction company plans living space under 2.40m and with too little window area.
For example, we only recently read that you need a second escape route and that our windows in the attic are not suitable for that. So actually, like with you, not permitted as living space. How is a layperson supposed to know all this anyway?

I don't like the construction company and maybe a demolition is the right decision.
Definitely talk to the bank as well.

Overall, you can still afford a house with your budget!
Whether it is enough for a double garage and other luxuries is very questionable though.
The earthworks, drainage and foundations still come on top for the garage.

My 2 options would be:
1. Continue building the plan with the 1 kfw subsidy. Do not finish the entire basement for now. Give up the garage.
Leave out everything else that is luxury.

2. Discard the plan and put the bedrooms etc. in the basement and try to save a whole floor that way. But then some sunk costs and the money from the kfw subsidy are lost.

From my point of view, option 2 would have been best to plan, but at the current state I would choose option 1. You really have a reasonable budget with which a house should be possible.

Best regards and don't let your head hang!

Maybe that is his goal as well? There are currently some companies offering builders money to get out of existing contracts. That’s what I meant a few pages ago by "finely off"

Also possible! They are definitely not dependent on us. The statement alone showed that he can also postpone our project indefinitely..

Yes, I read that and was already pissed off. One could also call it coercion or blackmail.
In my opinion, what he is doing is not lawful. So you could set deadlines for him... or try, at least because of the non-approvable planning, to put a stick in the wheels if you have already paid for the service.

The question, however, is also what is most beneficial for your finances and your health.