Should I fax you the construction contract now or what?
Rude again. (But I did keep reading ) If you continue like this, you’ll be building without the forum’s help.
It may be that your work contract covers these amounts.
Nevertheless, ancillary construction costs, for example, are always borne by the builder; they have nothing to do with that, so these are estimates from those who like to keep them low.
On the other hand, it is very likely that additional costs will arise once the trades start asking questions, be it for different screed heights, better wood for the stairs, or higher-quality tiles. Just the partly inferior material that was not considered in the construction specification will then want to be upgraded. Your construction specification probably won’t shine with the final price now and very likely will not include some items that you expect. You are not the first and only one to have bad experiences, but everything can be found under the category construction costs regarding what others had to pay extra.
The house is a city villa with 188sqm and 52sqm solid garage
House price with 10k buffer and 10k for kitchen 399,000
Outdoor facilities flat rate 20k
Ancillary construction costs flat rate 20k
By the way, Brandenburg is not that expensive, but they can’t work magic over there either.