Rent a house or buy/build? How did you decide?

In our construction area, a house is currently being offered for rent (BJ 2014) (bungalow 112m², 577m² plot and double carport). Since the house was built at the same time and, to my knowledge, with the same GÜ, I estimate the construction costs including the plot (approx. 57T€) to be around 280-300T€ in total. The cold rent is 1200€. Interest rates at the time of loan conclusion were probably around 2.5%-3%.

Depending on how you calculate
1. pure liquidity consideration
installment + additional costs + reserves versus rent plus additional costs

2. accounting consideration
depreciation + interest + reserves versus rent plus additional costs

3. liquidity consideration without taking capital accumulation into account
interest + additional costs + reserves versus rent plus additional costs

you arrive at different results.

You have to add the maintenance costs to your repayment, which otherwise a landlord would bear. A new heating system after 24 years is, for example, realistic. The long nose is significantly shortened by such things

No, not really. You don’t really believe that a landlord who knows even a little about what he’s doing wouldn’t cover a new heating system through a small amount in the rent (not additional costs!), do you? In other words, of course I also pay for it as a tenant, and in advance!

By the way, we don’t set anything aside extra for maintenance. We just save, just as we would in an equivalent rental property. The savings just sit idle in the account and are used when we need them. No stocks, funds, or other investments.
And when I do the math that I have 1000€ more in my pocket monthly once everything is paid off, 10k€ for a new heating system really doesn’t bother me.

: and if that happens, it's not a problem either

: it was the same with us, we got the plot by lottery.

We are not building just to live "cheaper," there are many other things like comfort / garden / size. And I guess that's the reason for most people here. If you want it that way and can afford it, why not? If you shop at the hardware store for €5000, then you want it that way and not because you are forced to.

No, not really. You don’t really think that a landlord who knows at least a little about what they’re doing wouldn’t cover a new heating system through a small increase in rent (not additional costs!). So of course I, as a tenant, also pay for it, and in advance!

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That’s true, in our newly built, first-occupancy apartment we are allowed as tenants to officially pay for the heating. They didn’t buy it new but rented it, so we (9 parties in the building, 7 of them owners) pay on top for the heating.

And just a quick note: we pay about 1150 euros warm for approximately 80 sqm of living space including balcony....

That's true, in our newly built first-occupancy apartment, we as tenants are officially allowed to pay for the heating.

Whether purchase, rent, or leasing of the heating, the costs are borne by the landlord. Therefore, they are of course calculated in.

No, not really. You don’t really believe that a landlord who has even a little knowledge of what they’re doing wouldn’t cover a new heating system with a small amount included in the rent (not the additional costs!). Of course, as a tenant, I also pay for it in advance!

By the way, we don’t set aside anything extra for maintenance. We simply save, just as we would in an equivalent rental property. The savings just sit idly in the account and are used when needed. No stocks, funds, or other investments.
And when I calculate that I will have €1000 more in my pocket monthly once everything is paid off, €10,000 for a new heating system doesn’t really bother me.

Still, you have to bear the maintenance costs at some point. Whether then in a lump sum in 15 years or as a monthly reserve. And if it needs repair in 6 years, then you also bear those costs.
If you’re going to compare, then do it properly and not with such deceptive calculations as you’re currently making.