Changing floor plans of model houses from the catalog - additional costs?

Good day,

we are still in the idea-finding phase, leaning towards a prefabricated house or a solid house from a larger provider. Completely custom planning is currently not really an option.

We do find some model houses quite appealing, but have not found a floor plan that matches our current ideas 100%. More or less small changes would be made for every floor plan:

- From an open kitchen, we would like to make a closed one.
- We could quite well imagine an example design if the house is built 2-3 meters larger to the left, so that the corresponding rooms adjoining the left exterior wall become correspondingly larger.

Every provider advertises that the catalog houses are just ideas and each house could be replanned. But what does that look like in terms of cost? So far, our impression is that people tend to be rather reserved here?

Installing a non-load-bearing wall surely doesn't cost a fortune, but enlarging a house in terms of the exterior walls? Do you have to reckon with enormous sums, or are we still talking about a four-digit amount?

Thanks for experiences!

We are working with a provider who generally plans freely; with the other providers we visited, it was the case that as long as the exterior dimensions remained the same, one could redesign the interior. There was then a cost adjustment. We have a rather unfavorable front width, which meant no floor plan fit directly, so there was an immediate surcharge of a few thousand euros with all of them.

It becomes more expensive when rooms are added because of doors, electrical work, etc. In general, that is exactly the crux... it never fits 100%; often what follows is a botched improvement of a suboptimal design. A house is, after all, a more or less complex system. If you change wall A, it affects room C, window D, and door hinge X, and besides, you now bump your head on the stairs. What I mean is that it is often easier to start from scratch than to try to revive a dead fish.

You also need new structural calculations for a larger house - that's not cheap either!

My neighbor has a bungalow from Heinz von Heiden: simply extending it by a meter was not possible, for example, because it would have changed the house statics for the hip roof. Anyway - with a gable roof house, the length should be adjustable, but you can roughly say: an extension of one meter corresponds to an additional cost of 10,000. Especially the large BUs, which offer a variety of model houses, have difficulty with a major change. However, there are regional companies that are very flexible

We cannot confirm that regarding the costs, we have offers from Streif Haus, Fingerhaus and Büdenbender (there was free planning anyway) and with these type houses we had to shorten in width and instead extend in length. The structural engineering naturally had to be redone, but it was not a 10,000 euro surcharge. More like half.

None of these providers resisted changing the external dimensions, but with the note that it would be a bit more expensive. Of course, at first (maybe somewhat compulsively) they tried to force our wishes into the given form, but when we made clear that it wouldn't work like that, they planned anew.