I wonder how they come up with 25,000 consumption :) But I'll find out
Probably due to poor (or as others said, "typical for the year of construction") thermal insulation. I even had concerns that consumption would be even higher with full occupancy, because if the "son" of the owners accompanies the viewings, then he is certainly not a minor and probably does not live with mom and dad in a non-university town. Please make sure to find out how many people have lived there over the past few years.
I just quickly pulled out our 2021 statement as well. Multi-family house with 4 units. Our condominium approx. 125 sqm over 2 floors...
But I still need to study it. At first glance, I don't quite get it yet :/
What don’t you understand? And above all: what do you want to learn from a multi-family house statement for your single-family house? In my opinion, it contributes nothing.
or just plainly asked: (For "normal, no war/crisis times") and partly modernized (new windows, insulated roof, insulated basement ceiling)
Let's not assume that natural gas will ever again become a popular and affordable energy source. Whoever can get away from it, should do so. And you can with this property.
and for the single-family house
house fees 400€,
Well... the term house fees fits poorly with a single-family house. Heating costs 500 €, plus water, sewage, property tax, garbage, and all that. So we’d roughly be at 700..800 €.
reserves 125€
That’s not enough if you want to maintain the value. Very simplified (but common in valuation procedures) you can depreciate a single-family house over 100 years. So assume 1% of the investment sum per year plus inflation. With a building value after your renovation of roughly 400 k€, reserves of about 350 €/month to maintain value would be appropriate. At first, though, you’ll probably need less since you will bring quite a bit up to standard before moving in. Alternatively, of course, you could decide to only carry out the absolutely necessary maintenance and "use up" the house accordingly. Then your 125 € might suffice.
electricity 100€
That is already tight at current electricity prices for an apartment with a family of 3. Verivox currently shows 165 €/month for a 3-person household in Remscheid without bonuses.
But please: don’t put that much work into this house anymore. If someone really buys it from you for 540 k€ right under your nose, then enjoy the Schadenfreude.
...and if you don’t believe me: go to an independent financing advisor and have them offer you financing – and provide as little equity as possible (e.g., only 50 k€). Then you would see whether they agree – and what they think of the place. That is at the same time a good sample of what your competitors are being told. Good financing advisors also disclose their valuation (e.g. according to the Sprengnetter method).