Calculated construction costs incomprehensibly high

We obtained various offers back then, only one broke down the prices like that.

I only know one provider in the region who practices this approach. The catch is - he also has to achieve his (own) forecasts during the tender.

Why is that interesting for builders? Cost transparency!

Anyone looking for and needing cost transparency in the respective trades goes to an architect. Anyone looking for certainty in terms of a fixed price and a house in a standard "x" goes to the general contractor. Both together will never work. Rhineland greetings

For your orientation: We have 125 sqm, also 2 floors with a flat roof.

320 TEUR without clinker, raffstore, ventilation, outdoor facilities

If I scale that to your size and add all the extras... Not unrealistic.

Both together will never work

It didn't work for us either. We'll see where we end up cost-wise in April. I'm already curious.

An architect, with whom we are not building, once gave me a cost estimate of €340-360/m³ for conversion space.

An offer from a construction company reached this price quite exactly, but as a fixed-price option.

We have a basement (half livable due to hillside location),
above that 1.5 stories, 45° gable roof, 1m knee wall, ground floor and upper floor brick-clad, basement double-shell masonry plastered.
A basement is planned under the carport entrance (4x6m including one door and one window).
Price painter-ready, tiles in bathrooms, hallway, and stairs.
Price about €300,000 in NRW postal code 33***.

I contacted more than 20 construction companies, sponsors, general contractors, and architects.
At first, everything was horrendously expensive.
Later, the prices improved, especially after getting comparative offers.
As far as I can judge, the contractors include a lot of margin in the projects.
It is important to have a partner who does good work, meaning check references (ask around, circle of friends, etc.). If there is one who does not have a fully booked order book, he may also offer a better price.
For fixed-price offers, I would look for companies within a 50 km radius.
Asking construction companies directly without an intermediary usually brings better offers.

For fixed-price offers, I would look for companies within a 50km radius.
Asking construction companies directly without intermediaries usually brings better offers.

Our general contractor is a good 80km away and was able to offer a much better price than the companies from the immediate neighborhood.

just completed in NRW. I also see the prices as rather realistic and healthy, only our bricklayers/shell construction work was somewhat cheaper. The other trades fit and are partly at the lower end.