Small income - house construction, rental, and co

1. Is it even possible from a permitting perspective to place another two-family house on the property?
2. 170 sqm house + traffic areas/house connection or heating areas + parking spaces with 2 residential units in my opinion not doable for T€ 300
3. Why is financing only possible for 30 years?

According to the rent index (7€) I would only get 1200€ cold rent. Of course, that leaves little room for maneuver. What are the general requirements for rental buildings?

What requirements? Build and conclude the rental contract according to your wishes.

If I think further about the whole thing, at 30 years and 1.5% effective interest I come to a rate of 1033€. One should probably also consider the new KfW subsidy of 18k€ per unit, with which I would theoretically only have a monthly rate of 900€. (Would I even get 1.5%?)

Wrong, the rate does NOT change, only the outstanding loan is reduced.

Due to the interest deduction as operating costs and the construction costs through the 2% depreciation, some financial relief naturally comes into play afterwards, but should that be taken into account?

Not worth it with your "meager" income. Sorry, no offense.

Assuming this variant would be feasible.

Assume that this variant is not feasible (I tell you as a banker).

Assuming this variant would be feasible. How would it look on the bank side for another new build for personal use 1-2 years later, especially since theoretically the property (as equity) would already be assigned to the rental object?

No chance. Never

I think the idea is definitely feasible! 30 years is a long fixed interest period... so a long planning horizon. Also, the 5-% depreciation under [§ 7b Einkommensteuergesetz] can give you a small liquidity boost at the beginning. Calculate cleverly... then it will work out.

5% depreciation

How do you get 5%?... I just googled it. If I understand correctly, it's only for 4 years, then 2%? Am I thinking wrong? It's not 2 or 5% of the construction price that I get back. Rather, my taxable income is only reduced by that amount?

I think the idea is feasible! 30 years is a long fixed interest period... so a long planning horizon. Also, the 5% depreciation according to §7b Income Tax Act can give you a little liquidity aid at the beginning. Calculate cleverly... then it will work

But what if you are living next door in a dump? What's the point of all this?

Alternatively, I have thought about building and renting a single-story two-family house on part of the plot.

However, the control over the tenancy is still missing.

The house would cost 130k€ per 85m2 unit (painting/electrical work entirely self-performed). Added to that would be house connections, approval, and planning fees. So I’d roughly be at 300k€ for the entire property.

? Never mind...

Would I even get 1.5%?)

More likely you wouldn’t get a loan alone at all.

I simply have little desire for one or two full floors that might then be right next to my garden, maybe even with a party hut close to my bedroom.

Something like that is, after all, regulated in the development plan. What do you actually want to do that for? What’s the purpose? What do you expect from it? I mean: why do you want to build a little house and rent it out? Then you yourself hang around as a controller by the garden fence? Apart from that, it’s unlikely that you alone would get a loan.

How do you come up with 5%?... I just googled it. If I understood correctly, it's only for 4 years, then 2%? Am I making a mistake? It's not 2 or 5% of the construction price that I get back. Rather, only my taxable income is reduced by that amount?

Yes, for the first 4 years there is an additional 5%. So in the first 4 years, it's practically already 28% of the costs as depreciation. So already 84,000 euros reduction in taxable income. Or 21,000 per year. This leads the original poster to probably get back all of their income tax in those 4 years. About 4,200 euros per year. So a total of nearly 17,000 euros. This should represent the liquidity advantage I mentioned in the first years.