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

A granny flat with a ceiling height of 2.25 m is not habitable anyway. Why doesn't the building authority see such a defect? ...

because in the exemption procedure nothing is checked at all. By applying for an exemption, the applicant declares that all legal regulations have been complied with.

The budget is 530,000 + 57,000 KfW funding.
However, the offer price naturally does not include the garage, furniture, ancillary costs such as construction electricity and telephone, as well as exterior facilities apart from the driveway and terrace.

I just want to say that your budget is a fortune!
If your general contractor no longer wants to build, compensation would also be due to you.
I know many general contractors who have compensated customers with 20-40k for a contract termination.

Then you simply look for a new shell construction company, carpenter, roofer.
Someone for the facade, etc. Why shouldn’t something like that work?!

Then you just find yourself a new shell builder, carpenter, roofer. Someone for the facade, etc. Why shouldn't something like that work?!

At least in Baden-Württemberg you need a construction manager. And as a layperson, I don't find it so easy to just award the trades.

But I don't think the budget is wrong per se. With a residential basement, it could be tight if you simply multiply the roughly 180 sqm mentioned here somewhere by €3,000. But I currently find the calculation difficult :(

Question: If the contract is void due to missing cancellation instructions, would one be entitled to compensation? Or would the provider even be off the hook?

At least in bw you need a site manager. And as a layman, just awarding the trades is not so easy. But I don’t find the budget wrong in itself. With a basement, it might be tight if you calculate the roughly reported 180 sqm here times 3,000 € flat rate. But I find calculation difficult at the moment :( Question: If the contract is void due to missing revocation instruction, would one have a claim for compensation? Or would the provider even be off the hook?

Without digressing, in NDS you also need a site manager. Logically, you then enter yourself. But project management should not be underestimated at all. But in the end, it naturally saves a lot of money! I believe my neighbor never had anything to do with construction either; she also managed to get the trades as a 55-year-old early retiree. Such things are of course always stressful, but I also know people who had stress building their house despite a general contractor.

Logically, you enter it yourself there

In bw it just doesn’t work like that, that’s what I wanted to express :) You won’t get a red dot without a qualified site manager. How it is in Bavaria, of course, I don’t know.

In bw it simply doesn't work, that's what I wanted to express :) You won't get a red dot without a qualified site manager. Of course, I don't know how it is in Bavaria.

Typically German, just a matter of the state. I didn't know that. Thanks for the lesson.