Rental house - prefabricated house or "conventional" brick construction

The prefabricated house providers predominantly build in a fashionably current ....

Especially the providers with large market shares want to maintain these and were trendsetters in terms of individual planning.
....

By the way, that also exists with prefabricated house manufacturers.

I am curious when you will finally let the cat out of the bag?

How nice that you come directly from Schlauberg.

That is exactly the right person to say ...

First contact a tax advisor and have the tooth pulled with 100% equity. Profit killer.

First question: What is easily rentable in the area? Is there a university? Is it rural? Or urban? Rule: The smaller, the higher the price per sqm.
Who do I want to rent to? A three-room apartment works both for a young family with one child as well as for older people. An apartment of 45 sqm usually only works for singles. Four rooms, that's already the size for quite large families. It's best to clarify these questions at a consultation hour of Haus und Grund. That's basically the landlords’ club. As a landlord you will join anyway, if only because of the legal advice they offer.
The trick to have at least 5% return before taxes is to build appealing but cheap (a flat doesn't need a guest toilet, people). That has to be clarified exactly with the contractor. That's why the apartments all look roughly the same. That’s how one does it. Otherwise, it doesn’t add up. My 5 cents.

In general, I agree with you that a higher price per sqm can be achieved for smaller apartments, but as you also write, it of course depends on the tenants you want.
I just don’t understand why 4 rooms are supposed to be suitable for large families. 4 rooms are enough for MAXIMUM 2 children, which is certainly above average but far from large families...

First, contact a tax advisor and have them take the wind out of your sails with 100% equity financing. Yield killer.

I wanted to write that as well. It doesn’t make sense to finance the property 100% with equity. Usually, we recommend an equity ratio between 20 - 40%. You have to distinguish between total return and return on equity. The return on equity is basically how much "interest" (return) you get on YOUR money. Example: You invest 500,000 and receive 2,500 rent per month, i.e. 30,000 per year. If you finance everything with equity, you have a return of 6%. If you finance 300,000 and only use 200,000 equity, then the calculation looks APPROXIMATELY like this: With 60% financing and (assumed) 2% interest on the loan, you pay about 1,100 per month to the bank over 30 years and you keep 1,400. That means for your invested 200,000 €, you get 1,400 €, which results in a return on equity of 7%. Additionally, if you finance everything with equity, you have to pay taxes on the entire rental income, whereas in the second case you can deduct the interest costs of the loan from your taxes. Of course, you have to calculate the whole thing precisely for your case with your tax advisor, but just as a thought whether it might make more sense to even purchase 2 properties and finance each partially.

but just as a thought whether it might make more sense to acquire even 2 properties and partially finance each of them.

Well, then everything is clear: build your own two-family house with the residential construction company (first 40% equity), buy two more residential units completed by them (second 40% equity), and invest the remaining 20% equity with staggered maturities and be able to withdraw maintenance and repairs from it without increasing the financing.

After the conversation with the tax advisor, the floor plan and building materials question will fade away ;-)

It's not always that simple, unfortunately; you always have to consider the individual case...