Is it possible to build cheaply in Hamburg?

That any service not contractually agreed upon costs money. Is rather low budget

Sounds like BMW or Mercedes additional charge policy - also not low budget. The price of a base vehicle quickly doubles with desired equipment and some engine power. The base is just as good as the top model. 400k in the Hamburg area - maybe for a property in need of renovation. New construction rather not.

I am well aware that not everything has the same price... I have never claimed that... I just don’t see why building with Town & Country should be riskier than other types of construction. My experience so far rather gives the impression that Town & Country has a bad reputation mainly among those who have not built with them and have not considered/done so.

Because Town & Country is a franchise company.

We were actually thinking of a prefab house.

A prefab house is not necessarily cheaper than a solid house! It seems that this is what you were thinking.

For 400 TEUR in Hamburg or the surrounding area including land? I would now consider that almost impossible in almost every region.

Why not? Slightly away from the centers and without exaggerated demands on plot size and equipment, that is quite possible.
We personally are a bit over 300k and if we had gone another 10 km further out, 250-270k would also have been possible.
But I also consider 400k in and around Hamburg to be utopian. I also don’t quite understand what one could have against Kiel.

Why not? A bit away from the centers and without excessive demands on plot size and equipment, that is easily possible. We personally are at a little over 300k, and if we had gone 10 km further out, 250-270k would also have been possible. But I also consider 400k in and around Hamburg to be unrealistic. I also don't quite understand what people could have against Kiel.

Really, including the plot and incidental construction costs & co.? Then I withdraw my statement.

If I assume a reasonable size (~140 sqm), usual sqm prices (~2000€), incidental construction costs (~30k€), etc., the plot must be either small or very cheap in order to get below 400k€...

Everything drifts off here, please do not misunderstand. It is just built more cheaply, with cutbacks. For example, a different brand of sanitary fittings. But if additional costs arise, you may need supplementary financing.