New construction with existing debt - feasibility question

So in our expenses, there is a saving of 1500€.

Sometimes even more, Corona is preventing that anyway. I browsed the other construction forum and still find the price high. Simply know many people who have built much cheaper in the last 5-10 years. Construction inflation was probably high.

The house would not be turnkey for that price but ready to move in and livable.

What else do you think most people have to add on?

Sure, you also buy furniture etc., but by the time that is done, you will have saved another 10-15k (unless the construction swallowed it).

So in our expenses, €1500 savings are included

And? Take 7100 and subtract your savings rate. There are families here who save more on the side than you do and have just about €4000 net together. You spend over €5000... that requires "a lot of free time"

Simply know many people who built much cheaper in the last 5-10 years. Construction inflation must have been high.

No... not everyone breaks down every bill transparently.

What do you think most people still add on top?

You have to read for yourself. It’s all already written:

So, I'm already on page 50 of your thread and of course you have to pay attention to everything and create your own checklist.

I don't quite understand the saving part. We are currently paying off an old house and the additional costs are therefore somewhat high. Including additional costs, we are over 2000€. Then I don't understand how you want to save a lot with 4000 net, without feeling like a student.

What many people don't understand here when people with a good income have no equity: Many invest money long-term and then prefer to borrow from the bank at 1.6% construction loan instead of forgoing the 5% return. Currently, equity is only important to get below 90 or 80% for the better interest conditions. This is also possible with nice parents and small basic debts.

What many people don’t understand here when people with a good income have no equity: Many invest money long-term and then prefer to borrow from the bank at 1.6% mortgage interest instead of giving up the 5% return.

Giving up THE 5% return (guaranteed) - "guaranteed" container funds, trendy investments and bonds from the S-Bahn advertising (not long ago, it also promised fantastic green returns), or hype stocks, like back in the day during the Neuer Markt?

Good evening Murmelstein,
first of all, I am keeping my fingers crossed for your new project.
Now I will address your possible financing:
Your net income is €8,000 (I am deliberately leaving out the bonus payments; this is a buffer that I would not include in the financing if I were you.
As a rule, banks deduct 40% of your income (depending on the bank, either a percentage value is applied to the total income or standard household costs per person and child are used; since you also have insurances etc., the 40% fits quite well).

€8,618.00 Net income including child benefits
./. €3,447.20 Household cost flat rate
----------------
€5,170.80 Subtotal
./. €300.00 Private health insurance (PKV)
------------------
€4,870.80 Subtotal
./. €650.00 Loan installments including €400 car loan
-----------------
€4,220.80 Subtotal
./. €1,600.00 Loan installment existing house
------------------
€2,620.80 Subtotal
./. €500.00 Operating costs new property (€2.5 per square meter)
------------------
€2,120.80 Subtotal
./. €2,456.25 (fictitious installment of new financing with an assumed loan amount of €655,000 and an annuity of 4.5 percent)
-------------------
- €335.45
+ €1,600.00 (discontinuation of installment existing financing)
-------------------
€1,264.55
./. €166.66 (bridge financing of €50,000 with a fictitious rate of 4% - only needed until the existing property is sold)
-----------------
€1,097.88 Surplus until the house is sold and the bridge financing lapses

Following comment regarding your planned house sale: Since you have chosen a model in which you do not repay anything on your previous financing (only contributions into the building savings contract), the prepayment penalty will be correspondingly high.

I would structure your financing as follows:

Bridge financing of your existing property with the planned extra proceeds of €50,000 and finance the full amount of €655,000 at one bank. To what extent KfW loans or state promotional loans can and should be integrated I cannot conclusively assess based on the information provided so far.
Regarding your "hope" that the previous financing bank will be "lenient" with the prepayment penalty, unfortunately, I cannot confirm this based on my experience. However, I am keeping my fingers crossed that it will be different for you.
If you have any further questions, I am happy to assist you.
Best regards

Complete interim financing and then sell under the premise of staying in the house until completion. YES, and if necessary pay rent, the loan will be repaid with the sales proceeds.