Realistic construction costs & financing planning?

I have not seen any interest now, or how the amount is divided. What happens to the private loan (parents) when they die. What happens to the employer loan in case of job change. The option with the [Bausparvertrag] just costs some fees and higher interest because you don’t repay in the first 10 years. The rate would also be clearly too high for me.

The rate would be clearly too high for me for 140sqm with that income. 140sqm houses are available here for less than half (BW) as rent.

After 23 years, you still pay rent and the OP has a rent burden of 0. You should compare cold rent with interest burden (not with repayment). Or add the repayment to the cold rent if you want to make a correct comparison over the term (you can also apply a discounting if you wish).

Combination of private loan, employer loan as well as interest-only loan in combination with home savings contract. Monthly rate: €3,200

Of course, no one here can assess this construct. Assumption: classic financing, at €3,200/month you would reach an interest rate of 2.6% and repayment of 3.16% over approx. 23 years. Private loan probably 0% (100 k€?) and employer loan certainly under 2% (100 k€?), then the “home savings stuff” is clearly too expensive again. (Information is missing to be able to assess it, but the question was rather directed at the cost breakdown…) Here and there, in my opinion, a few thousand are missing: incidental construction costs, finishing work, outdoor facilities, furniture (lamps, curtains…) +50 k€ + 5% buffer… I would not calculate with a permanent €3,200/month…. you still have the “family building” ahead of you… that costs extra!

7500 € net income - currently 4700 € surplus..

Until the house is planned and built and a child is there, it is still possible to save properly and parental leave can be bridged and a house construction financed.

If necessary, the repayment will be adjusted until the parental leave is over and that’s fine..

Sometimes I really think some people get jealous when young people with top income appear here and immediately "scare" them because of the installment and parental leave etc.

go for it, you have TOP conditions! Make sure you continue to set aside your surplus nicely before and during the construction phase so that you can build up a buffer and it will work out perfectly! Additional expenses can be paid directly like this!

sure? What about the floor coverings?

and what about the regular surcharges? The simplest example: electricity!

Much too little... I would add another €10,000 for the earthworks. If questions arise, first get informed (e.g. here in the forum) before going over the same topic again and again.

Also too little. Just covers the garden and landscaping concrete costs.

... I would plan a planning buffer of about 5% and a time war buffer of 10%.

Thanks for your feedback! All floor coverings and painting work are already included in this offer. So really, only the kitchen is missing and we can move in.
The earthworks are also well covered in the construction costs, so the ancillary costs are comparatively low here. But thanks for the hint, if that were not the case, our calculation would of course be too tight.
For the outdoor facilities, we will carry out a lot ourselves, so we had previously estimated that €25k would be sufficient.

After 23 years, you are still paying rent, but the OP has a rent burden of 0. You should compare cold rent with interest burden (not with repayment). Or add the repayment to the cold rent if you want to make a correct comparison over the term (from my side you can also apply a discounting).

I had written that the interest rate is probably quite attractive by today's standards and therefore the financing is actually okay. But if it were a market-standard interest rate, the initial interest costs would not be far from the cold rent. Even in this constellation, not much is missing.

At its core, it is more about the fact that a family with a net income of €7,500 can afford many freedoms. For me, this also includes the option to take a longer break when children arrive (both parents) or to travel for an extended period. But with an installment plus additional costs of almost 4K (and the mentioned income distribution), both partners will inevitably still have to work full-time.

What is the point of being debt-free in your mid-50s if you have to spend your best years working solely for the house?

Therefore, I am clearly in favor of:

1.) Either significantly reduce the installment or
2.) Look for alternatives.