House from the 1930s. Renovate or rebuild?

So the basement (in my opinion dry) is between 1.80 and 2m and has its own entrance. It is not under the entire ground floor, but only under part of the ground floor.

Basement: 65sqm with 5 rooms – unheated

Ground floor 90sqm (this was expanded in the 70s) with 4 rooms, hallway, bathroom, kitchen

That means originally it was actually fully basemented, later an extension was added and only that one does not have one?

I can’t imagine that a demolition pays off.

A demolition down into the ground is elaborate and a basement is not a good living room anyway, good substance is sufficient there. Shelves for preserving jars don’t need fashionable architecture.

Whether the "actual residential building" is redone, I would also weigh depending on how much compromise the existing building is compared to a new design.

The local forum discussions can be argued and become extensive just as much with existing floor plans as with those built "on the blank sheet of paper".

Correct, originally it was completely basemented. Then the extension came in the 70s and everything was renovated.

With the conservatory, I apparently completely miscalculated. Then maybe better a awning or something.

Apparently, renovation seems to be much cheaper than new construction after all. I wouldn't have thought so, since really everything has to be done and actually only the walls remain.

Is it best to commission something like this to some developer (liability and so on) or is it much cheaper if you find craftsmen yourself?

Does anyone have a good craftsman tip for the expensive jobs like

- Renewing and insulating the house facade VHF: 40,000 euros - realistic? (Asbestos fiber cement panels removed and new VHF insulation applied.)
- Roof renovation with new covering - 25,000 euros?
- 7 windows / 2x terraces / 1x balcony door / basement door: 10,000 euros
- 2 bathrooms new tiling / new pipes / bathtub / shower: 20,000 euros
- Removing old floors and installing click bamboo parquet and basement tiles: 10,000 euros
- Interior plaster (does that also contain asbestos?) and removing wood paneling and replastering: 10,000?
- Renewing old water pipes and heating pipes - 15,000 euros?
- Heating: Renewing old solar system on the roof - 10,000 euros?
- Renovation of the garage: 3000 euros (roof is leaking, walls are damp)

Do you actually start with the external insulation or the replacement of windows or the roof or do you just leave the roof as it is as long as it is watertight? A moss layer on the roof is purely an optical defect. You can theoretically insulate the top attic ceiling. However, then the roof slopes on the 1st floor (starting from about 1.60m) have no insulation?

I would be more skeptical about costs regarding renovation versus new construction. Renovation is a complex process. General contractors usually don’t take it on. That would be an architect’s project. Then it’s feasible. We are currently doing exactly that professionally with a 1969 house that we are completely refurbishing. It will cost us just under 400 altogether. However, the house is bigger than yours. And at every construction meeting I experience surprises. It never gets cheaper, I promise you that.
On the other hand, I can calculate a new build cleanly at a fixed price. I know: I have this, I need that, the bank provides this. Through the construction performance description, I know what I will get and with a proper general contractor, I know what extra I will have.
I think in the end it would be about the same. I think the basic decision is: Do I like the house? Is it also worth the effort and money to me in an idealistic way? Or do I rather want everything brand new?

So except for interior plaster and conservatory, I find the calculation okay. If the condition is good, it’s worth it. But have a professional assess it on-site beforehand. We mostly renovated our house from 1921 ourselves (100m2), partly with craftsmen. Roof newly converted, new roof windows with shutters, new cheap interior doors, good laminate, 3 new bathrooms (2 are toilets), some lead pipes had to be removed, new water pipes partly, completely new but simple electrical system, high-quality windows. So significantly less than you. Cost about €60,000. Everything standard. For us, it was the right decision. Eventually, we want to build an extension, and in about 10-20 years, the facade and roof will be due for renewal. That will probably cost another €60,000 or more. When you add everything up, we still wouldn’t have been able to build new for that (the plot with the old house cost €200,000). The plot alone is already worth almost that money now. Calculate it well and think it over calmly. A new build would be more expensive, but then according to your wishes. That certainly also has clear advantages. With an old building, you only really know what you have once you’ve torn everything open.

I hardly believe that such a complete renovation really comes cheaper than new construction.
If anything, the difference would basically only lie in the demolition and the masonry.
In my opinion, renovating an old house only makes sense if it has a special character, or if you want to do some work yourself step by step.
For everything else, a new building is better; the insulation values, structures, and quality of a new building can actually only be comparably achieved in very few renovations.

For example, during the renovation, I simply had to accept the position of the load-bearing walls as they were. Likewise, the bathroom and WC were barely changeable because the downpipe and sewer connection were fixed.
I would certainly have done it differently in a new building than it is now.

Of course, when dealing with an old building, compromises are made, that should be clear. But if you can assess the condition well, there can still be bargains.

We bought and renovated a lot. Many windows remained, as they were from the mid-90s, as well as the interior doors. Everything else was new including complete electrical work, complete water/sewage in the bathroom, etc.
In total, we ended up with about €240,000 all in. For that, we have the house (€165k + purchase incidental costs) and the renovation.
House from 1963 with 140 sqm and 5 rooms. 2 full floors and a full basement. Bricked with a few cm of mineral wool insulation. Loggia and covered terrace. Masonry triple garage. Overgrown plot 1000 sqm, irrigation system, etc. Winter garden, but without connection to the house.
Yard completely paved.

The price per sqm for building land here is €120/sqm.

Location is Lower Saxony about 35 km from Hannover. 15 minutes to the A7/A2.

And now someone please show me the calculation where a renovation with decent substance wouldn't be worthwhile.

Bought and renovated by the way last summer. So rather in a high-price phase.

Of course, not everything is super new, but with luck and negotiation skills you can buy good used houses and renovate. And that is worthwhile or can be significantly below the cost of a new build.