Construction costs rough flat rate calculation

Good morning everyone,

I have a question about the rough flat-rate calculation.

You often see in the forum that, for example,
the m² are multiplied by a value
(150m²* 1500€/m² = 225000€)

Are ancillary costs also included in such rough flat-rate calculations? Or are these added on top, e.g. 10%

Regards

D.Gerner

I would generally expect more... here I already read about 1800 per sqm. What I wonder is, how is the sqm number of the basement counted in?

The 1500€ is a basic equipment cost for the house alone without additional costs, without painting costs, and without any special requests.
For additional costs, there is a nice overview from Bauexperte, see . Additional costs cannot be determined as a percentage of the value of the house, as they often consist of flat rates (utility connections) or land-related costs (broker fees/property transfer tax/notary fees). The 35-40K€ mentioned by Bauexperte is a pretty good estimate. With a cheap plot of land/no broker fees/flat plot of land, etc., you can certainly also get by somewhat cheaper than 35K€.

The basement is extra and cannot simply be calculated with a flat m² price.
It depends on whether a precaution against water (white/black tank) has to be carried out and whether it is a residential basement or utility basement. In general, figures between 30K€ and 50K€ are repeatedly mentioned here in the forum (in unfavorable cases, however, even more).

Of course, prices also vary between federal states (north and east cheap, south expensive).

Thank you very much for the answers.