Construction costs are currently skyrocketing

Maybe someone here has an idea... What would be an acceptable additional cost to clad the chimney above the roof in RAL color instead of titanium zinc sheet?

No extra charge. When buying roofing materials, there is usually colored sheet metal available in all possible shades. You can also use Prefa sheet metal.

That is all cheaper than titanium zinc and lasts just as long. They also do all the cutting and edging. That doesn’t cost the world.
I had my roofs covered with interlocking tiles and needed a solution for the verge boards. The verge tiles would have been unaffordable, and cutting verge boards and laying them in concrete or working with sheet metal nubs was out of the question.

So I came up with something myself. I then had sheets edged for the verge in the color of the tiles. Some roofers were already amazed by that. I should actually get a patent for it. Well, the colleague from DEG initially didn’t want to because of the unusual shape, but then he did it for me after all.

The sheet metal used is also Prefa sheet metal. It never breaks and the coating lasts forever.

We have now received a cost estimate from the architect, 180 sqm living space, without carport, KG 200-700 … approx. 550,000

of which approx. 335,000 KG300 (building envelope, gable roof, brick cladding) equipment "normal" KG400 approx. 80,000 (ventilation, air heat pump + heating, electrical) 65,000 outdoor facilities and kitchen 14% incidental construction costs on the 420,000 = 58,000

Seems very (too) cheap to me. Who can still build for about 3000€/m2 nowadays? Depending on the area, this has even become difficult for MFHs. Are the prices net? Plan in enough buffer.

Seems very (too) cheap to me. Who can still build today for about 3000€/m2?

I don't find that at all - easily possible with us.... Even today. (Bavaria but not Upper Bavaria)

With us, it is BG 200-700: 626,942.00 for BGF 195 m2, whereby €54,956 alone is supposed to be the demolition of a 70m2 house + garage + shed. That means if that is omitted with markusla, then we would be at 200-700: 571,986, all gross. But without electric shutters/blinds, without photovoltaics, without heat pump, etc.

I don't find it so cheap now.

The Viebrockhaus houses are all around that range in size (+/- €30,000 and plus €30,000 for flooring/painters).