Renovation of a 1960s settlement house with extension - Feedback welcome*

Would you like to explain what leads you to that conclusion?

A housewife has a feeling for that, as Loriot says
I have been dealing with floor plan design for almost forty years, and every era has its style and its construction technique.

Apart from the wall thickness, I couldn’t differentiate between badly planned new construction and 60s old building just by the floor plans.

Wall thickness 24 can even be quite accurately placed in that time, in 1960 this was still basically the 50s. Shortly after, wall thickness 30 became more common.

By the way, badly planned new buildings are a very current trend, which was very rare in the 60s. I don’t use the term "Altbau" for existing buildings from this time, it actually refers to those from before 1948.

Nu ists aber zu spät,

For the house pictures thread, it is certainly not too late – there, a lot or even everything may already be finished. It is not a pure slab-on-grade thread.

: Thanks a lot for the feedback, it makes sense to us as well

I have uploaded the plans here, in which the existing building is also marked.

The question regarding demolition and new construction for us is whether we could even manage with our budget... For the demolition, I would roughly calculate 20,000 - 25,000 €. Does that roughly sound right? That would leave 275,000 € for the possible new construction. A basement is available. Own work is mostly limited to the destructive tasks

I have uploaded the plans here, in which the existing building is also marked.

Apart from the living room extension and a gigantification of the dormers (are you sure the development plan allows that?), I only see demolitions and relocations of non-load-bearing walls. Where is a budget of three suitcases supposed to be spent?