I am getting a plot of land as a gift. How do I finance the construction?

Riftayl you can apparently see into the future. Great... but construction costs are never fixed in advance. You can get an approximate estimate and hope it fits. But you’ve already planned everything.

Speculating with an inheritance is bad, especially if you then also find it stupid when your grandfather gets very old.
By the way, the gift of the property will be offset against your compulsory portion... just so you know. And a compulsory portion assumes that by then your parents have also died. Keyword inheritance. Many an heir has been caught off guard after the grandparents died following years of care. €5000 per month for a nursing home is not uncommon.

I consider your plan naive and stupid, but everyone is the architect of their own fortune. And apparently, you don’t have to fear any consequences of your actions since there is backup... so just be brave, may you succeed.

That is why I do not speculate with the inheritance! Of course, I am still mentally healthy enough not to consider a death as something nice! Therefore, I ask not to be portrayed as a bad person here in this forum. I calculate with what I have and what I will earn from the rent – and also with rental losses. I am also fully aware that the costs are not fixed down to the cent. So far, none of my calculations have reached €250,000, but I factor in that it will be more expensive.

The property counts towards the compulsory portion for 10 years. After the 1st year only 90%, 2nd year 80%, and so on. Besides me, there are 2 other heirs. With my compulsory portion I could pay off my house and still make a good life for myself with the rest. Yes, my grandparents had a few million under their belt and I have no parents anymore. But that is a different topic and completely irrelevant to this thread.

And anyone who wants to finance a property has to look into the future. The worst case would be a car accident later on the way to work, where I could kick the bucket.

I would be happy if not everyone here would tell me "Give it up!" but rather help me with my project. Some numbers would be advantageous. Besides fire protection, natural hazard, and legal protection insurance, what else do I need?

I don't understand: Why do you want to rent out? People here have already told you several times that you won't make a profit with a single-family house. Do you really want to put yourself through the stress of being a landlord? What if the tenant ruins your house, leaving it a battlefield, or doesn’t take care of it, or doesn’t report water damage or worse: mold? Then they move out, and you’re stuck with a property that you have to restore expensively. You say you will inherit a large sum someday. Why don’t you wait to build until that time? Then you can move in yourself directly, you’ll probably be up to date with the latest technology, and you can plan the size better. Why insist on being a landlord at all costs? Life insurance and disability insurance are never a bad idea, although as a single you can skip the life insurance.

But still, I think rental income can be offset against the loan for tax purposes. Ask a tax advisor!

Profit/loss is calculated as follows:

Gross rental income
- Depreciation (2% per year of the production costs for the house)
- Interest on the loan (excluding repayment)
- Repairs
- paid ancillary costs
= Profit or loss from renting and leasing

Depending on the situation, a profit or loss may result.
If things go badly, the depreciation is less than the repayment. Then the rental might cash-flow to a "break-even business", but you would have to pay tax on a profit in your income tax.

Definitely don't do it....