He is not legally obliged to, but in the end it doesn’t help if the general contractor goes bankrupt/breaks down because he miscalculated. And the client is then left with a botched half-finished house. In the end, the client always bears the damage.
And no one has to check the exact calculation, and the client can’t do that as a layperson anyway, but one can and should check for one’s own sake whether the offers are generally within the usual range. That doesn’t guarantee anything yet, but at least filters out some impossible cases.
Correct.
But if the general contractor (does not intend to) comply with the construction service description and additional contracts with extra costs, then the whole thing is doomed to fail from the outset.
We had the damage as well, despite all precautions. And the price was steep, corresponding to the execution. There were no irregularities.
We had our own construction-accompanying expert commissioned, who checked the calculation, the construction execution, whether the information in the construction service description was even realistic, and who saw at a very early point where the whole thing was heading.
In our case, craftsmen who had been cheated earlier found out where the general contractor is currently building, about 40 km from before; former and currently cheated clients joined forces and also go to the same lawyer.