Single-family house from 1950 with backlog of renovations "Charm of the 50s" - renovation costs

To generalize: "in the past" people spoke of 1000 € per sqm for a major renovation. However, since the new construction costs from "back then" rose from about 2000 to well over 3000 € per sqm, it can probably be assumed that 1000 is no longer sufficient

To generalize: "earlier" people spoke of €1000 per sqm for a major renovation. But since the new construction costs from "back then" of about 2000 have risen to well over €3000 per sqm, one can probably assume that 1000 is no longer sufficient

At the beginning of the year, we were at €1,750/sqm according to the architect's estimate...

A little update:
So what definitely needs to be done is the entire electrical system (including laying new sockets and the distribution box / fuse box), 2 bathrooms renovated, one of them enlarged, there is carpet everywhere but "still good" wooden floorboards underneath (could be restored). Roof still good, but uninsulated, a few cracks here and there (since the owners never did anything major, we see these as uncritical, possibly just repairs), basement not damp, but uninsulated. Gas heating old, but still works, heating pipes etc. unfortunately installed on the outside, so visible in the living space, windows okay, but possibly still salvageable, as thick

For the year of construction and that nothing major has ever been renovated, it was surprisingly in good condition.

What do you think, where could the price range go? Thanks!

To me it sounds good. Do you mean by "heating pipes etc. unfortunately installed on the outside, so visible in the living space" that the heating pipes are surface-mounted (or how do you say it)? I don't find it that bad, we had that too and it gives the rooms a bit of an industrial character. Or you just hide them nicely.

Unfortunately, I can't say anything about the costs, since my husband did almost everything himself with friends in our 50s house.

For the year of construction and the fact that nothing major has ever been renovated, it was surprisingly in good condition

Who is saying that now? A building expert or you as laymen?

We were at €1,750/sqm at the beginning of the year according to the architect's estimate...

Here we go again. I've already written elsewhere about claims that obviously drive the prices up badly. No one wants to do anything themselves anymore and many try to renovate an old building as if it were completely new. That can only get expensive. I only brought up your statement without specifically referring to you. The architect alone already costs a lot. That also suggests that major changes in the floor plan are planned. That requires structural calculations and certain measures. Both are enormous price drivers. On the topic: Electrical work costs around €15k if you assist the electrician. Just insulating the roof comes to under €5k, I estimate. Also in EL. And it’s no rocket science to stuff some wool between the rafters and staple and tape a foil over it. The top floor ceiling is even easier. Bathrooms cost depending on the level of demand. You can also gut and remove old pipes yourself. Heating depends on what you want and can pay for. I would plan at least very large radiators if the screed absolutely has to stay. And no, it doesn’t take 10 years at all and yes, the above-mentioned can truly be done by any normally healthy person themselves. And that way you can save a lot of money.

Of course, it's always a matter of expectations. Since the thread creator is sparing with information, you have to present them with the all-in. The architect's fees were, I believe, estimated at about 20% for us, which I already found quite steep... But that was including service phases 1-8 (or 9?).