Determination of construction costs 2024 for bid submission for a plot of land

As a person who already owns a home, I can of course say that boastfully, but I would simply wait until the first applications – which, as you say, were based on the interest rate level and construction prices from last October – fail.

But: What values do I assume for a new build in 2024 (construction costs plus ancillary costs).

What would one have estimated in 2020 for 2022?

You just have to be clear that you can now buy a plot of land for a lot of money (>450€ vs. 260€ municipal land), while construction costs and interest rates are doing pretty strange things. Whether in 2023/24 your money will still be enough to actually build a house acceptable according to your ideas, you have to answer yourselves – your assumptions/buffers are certainly not unreasonable.
With the appropriate cash reserves, you can do it, but my risk tolerance would be sensitively disturbed today.

I could definitely no longer build my house today without a queasy feeling, given the interest rates and changes in construction prices over the past few years.

As someone who already owns their own home, I can of course say that boastfully, but I would simply wait until the first applications – which, as you say, were based on the interest rate level and construction prices from last October – fall through.

Honestly, I also consider that to be the only sensible strategy at the moment. Unfortunately, all values and assumptions are missing here. How large is the plot, what were the previous assumptions about construction costs, etc. If money is no issue, go ahead. But I would indeed assume that overall many will no longer build. If someone still thinks that 500€/m2 is a good investment, let them go. The mood currently looks different.

However, for example, the large thread on construction costs is about everything,

Luckily, there is not just the one thread, but also dozens of others that deal with real construction costs.

What values do I assume for a new building in 2024 (construction costs plus incidental costs).

Some also make it easy for themselves. Ask a question and then lean back.

I always say: there are things in life you have to do yourself. Of course, we could now throw the 3000€/sqm at you. But then you still wouldn't know what the 3000€ consist of. Are the incidental construction costs included or not? What actually belongs to the incidental construction costs? Do you need a pile foundation or what's the deal with the earthworks if all that is included in the construction service description?! So, if you do not fill out your table yourself, you will later lack basic knowledge, because on the invoices there will not be 3000€/sqm, but rather many individual items.

Unfortunately, all values and assumptions are missing here. How large is the plot of land, what were the previous assumptions about the construction costs, etc.

That's how it is, nobody knows anything precise.

To account for the dynamics, we could increase the monthly rate by about €1,000

Which rate? What amount? From €2,000 to €3,000? Total budget and then calculate backwards. Very "simple".