Strategy for selling a house - what is the best way to proceed?

Watch the market where you are: how expensive is a/THIS house in your region. Compare! You can then very well see how the price comes together: plot size, age, living space, location…
Or: your costs including all, also construction costs, development, purchase costs. For a quasi-new build you can use that as a guideline for up to 4-5 years. Then add the market development: e.g. 10-15% surcharge for one to two years currently or similar.
Before that I would consider: the trait greed, meaning to rake in as much as possible, or fair, meaning eye to eye with the potential buyer.

Those are good points to think about, thank you.
I’ve been watching the market for quite a while. The problem I see is that houses like ours rarely appear.
Mostly much older houses (from the 70s to 90s) are offered around here; if they are about our size, they are usually listed around 400-450k.
Now, I find it hard to apply that to us – we don’t have a bathroom in need of renovation, we don’t have an old heating system / old roof, the place here is practically new. Therefore, I’d find 450k too little.
Then I sometimes see semi-detached houses (new) offered, often around 390k – but they are smaller, and the plots are only half the size. But a new semi-detached house, cheaper than a 30-year-old detached house? That does not make sense to me.
It’s similar with newer bungalows. I sometimes see them listed that cheaply, but again smaller and with smaller plots.

That’s why I don’t know where to position myself. I’m going to take a risk and say my rough idea is currently somewhere between 500-570k. But that’s quite a big range. I actually don’t want to go below 500 given the market situation and the features we have.
Or do I have crazy expectations?

I have been watching the market for quite a while. The problem I see is that houses like ours rarely appear.

I wouldn't call that a problem, quite the opposite :)

Therefore, I don't know where to position myself. I'll take a risk and say my rough idea currently is something between 500-570k. But that's quite a wide range. I actually don't want to go below 500 given the market situation and the features we have. Or do I have crazy ideas there?

It's less that your ideas are crazy, and more that the market is. In that respect, the only fundamental mistake you could make is trying to think "rationally" about pricing: trying to reason yourself into fools with reason, logic, and similar "nonsense" can only end up thoroughly wrong ;-) [see PM]

But a new semi-detached house, cheaper than a 30-year-old single-family house?

Because of the land value, you of course have to subtract that every time. With the older houses, the larger plot is equivalent in value to the age of the house.
Old building on 1000sqm = 400,000€
200,000€ house + 200,000€ land

New building on 500sqm = 400,000€
300,000€ house + 100,000€ land

This is of course just a rough estimate

[QUOTE="kati1337, post: 547965, member: 51345"]
That's why I don't know where to position myself on this.

If you don't understand math, of course that won't work.
However, you also have to know that it’s not about an exact value. But you can probably calculate/estimate it to within ±30,000€[/QUOTE]

I wouldn’t call that a problem, quite the opposite :)

That is exactly my own experience. If you have a house that is usually never on the market in this standard, with tasteful/more comfortable fittings in this (rural) region, I would bet that people will immediately be interested.
In the past, in my opinion, it was even possible to check how many search agents are currently set up.
Just reading here in the forum makes it clear how many people everywhere are looking for a nice house.

Therefore, I don't know where I should position myself there. I'll take a stab in the dark, my rough idea currently is somewhere between 500-570k. But that's a huge range. I actually don't want to go below 500 given the market situation and the features we have. Or do I have crazy expectations?

Then I would list it for 570k and see what happens.

I would hang over the fence on the right and left and spread the word that my house would be available for around 600K€, the same in the [Kita], yoga group, acquaintances, bakery, etc., and then wait. What do you think, why so few good houses appear in the ads?