Assessment of (partially) renovated house from 1961

Ceilings were taken down because they apparently found reed (?) and other stuff
The floor plan on the ground floor was changed, for which a beam was installed. Structural engineering by architect.

Wooden ceiling, I had expected that. As I said, the 1950s lasted until 1963. The renovation with the beam should be investigated further.

The terrace was shortened and "redone" (I don’t know exactly what that means, but it was apparently insulated in some way?

Even as a non-expert you should ask about that. Invoices talk about what was done.

24 cm exterior walls, material unknown, uninsulated.

At least 24, not 25 anymore. So no longer the old Reich format. Possibly already hollow blocks. Insulation (what do the eaves do?) is always a neighborhood issue with semi-detached houses.

I was not allowed to take pictures for privacy reasons,

What privacy do reveal jambs and eaves have?

The roof was already converted and inhabited at the time of moving in, they could not show me a building permit. Regarding the dormer: Since the dormer was allowed to the neighbors (everyone was asked), one should probably be able to build a dormer in the future without a building permit (is this correct?)

That is of course not true, and illegal buildings know no statute of limitations or customary rights. After 1961, building authority archives were no longer bombed out. At the latest with earlier renovations, plans were filed in the records. Whoever wants to sell their car should still find the latest TÜV report.

According to the Building Energy Act, it is also mandatory for me in case of a purchase.

No. Basement ceiling is not mandatory.

Not bad, since asbestos has sometimes been found/is found in tile adhesives.

I wouldn’t care about fear. Nice bathroom or does it need to be redone. That’s the question.

What is the recommendation for the maintenance reserve? That would be on top of that.

Depends. What do you expect in the next 10 years? You should save for that.
In 30 years and various houses, I have never saved separately for the house. I would never do that either. Rather save generally. But that is a personal choice.

So much for that. I was not allowed to take pictures for privacy reasons, which is OK with me.

That would be a no-go for me. I mean, not being allowed to take photos. They want to sell and have to expect that you check the property. That also includes taking enough photos for yourself as a potential buyer to look at them yourself but also to make them accessible to third parties. That does not mean posting them in a forum, but at least to acquaintances or relatives or experts.
And yes, as also points out: roof substructure or basement walls say nothing about privacy.
There is also no alternative that they give you photos, because they cannot include questionable spots.

Electricity 150 EUR per month (including water), with 1000L oil per year that is (at least) 75 EUR heating per month.

These are not at all shocking values or costs. 150€ electricity is practically average and can be positively influenced by LED and modern appliances.
75€ is also not shocking, rather the opposite. Although I find it hard to believe. But that is just a feeling.
I find this property much more interesting in terms of its internal qualities:
Scout-ID: 160075528 | Object No.: 160075528

150€ electricity is basically average

Only with an electric car. That is up to 7,000 kWh for just over 100 sqm and thus a small family. At least double what would really be average.

Roof covering still from 1961

What is the condition like? And the material? Especially here, I would rather assume that something needs to be done – or there will occasionally be minor damages.

The roof was already removed at the time of moving in and lived in, I could not be shown a building permit. Regarding the dormer: Since the neighbors were allowed the dormer (everyone was asked), one should probably also be able to build a dormer in the future without a building permit (is that correct?)

Unfortunately no. That is not correct. I would assume that a building permit is needed for a dormer here. However, I assume that it will be approved. (We have something like that with terraces – according to the development plan, south-facing terraces would be forbidden, but everyone has south-facing terraces. Everyone needed and received a special permit for that. Us too. Our justification in the exemption application: Everyone else also has south-facing terraces. It was approved.)

The electrical work was done by an electrician in the family. In the fuse box, I saw a mix of rotary fuses and RCD switches. Wallbox present. Network also installed

The fact that there is a functioning wallbox is already a good sign. Still: I would have it checked independently and prudently keep money ready for electrical work. There could also have been things done that do not meet today’s safety standards.

No moisture was visible, the cellar smelled different than the house, but I have not found anything that could indicate moisture

How did it smell? If it smelled distinctly musty: Mold could be hiding there!

Energy class D, according to the energy consultant no short-/medium-term measures needed. The only thing that worries me a bit is the additional costs. Electricity 150 EUR per month (including water), with 1000L oil per year that is (at least) 75 EUR heating per month.

Electricity costs at that level either come from the wallbox or old devices. I believe that with a normal consumption and a normal contract, one would end up significantly lower here. I consider energy class D really good for the year of construction, I would have expected a worse energy class (also because pretty much all buildings on the market here in the area have the worst energy class).

Only with an electric car. That is up to 7,000 kWh for a little over 100 sqm and thus a small family. At least twice what would truly be average

The wall box is used for something after all. Then devices that are 10-15 years old, hot water, presumably old neon tubes in the basement, practically indestructible. I think that fits just fine