Subsequent change of the lending value - What happens?

Again for my understanding. You have amount x as a loan and amount y as equity. Both are fixed at the time of financing. The equity reduces your loan-to-value ratio. If the construction sum increases, you will either have to refinance or raise more equity. Refinancing will occur at worse conditions as soon as the loan-to-value limit of 60% is exceeded. Therefore, I do not understand why you believe that an increase in the construction sum improves the loan-to-value ratio? With fixed equity and an increase in the construction sum, your loan-to-value ratio at the time of initial financing worsens and not the other way around.

Maybe we have slowly hit the core of our misunderstanding. If the costs increase with a fixed loan and fixed equity, you could save equity elsewhere and use it for the house. For example, buy cheaper furnishings, skip the vacation, drive the old car for one more year, initially not buy the Weber grill (these are just examples).

So loan fixed and equity fixed. Plan a low construction sum -> worse loan-to-value, plan a higher construction sum -> better loan-to-value. Or am I still making a thinking error there?

Maybe we have slowly hit the core of our misunderstanding. If costs increase with a fixed loan and fixed equity, one could save equity elsewhere and use it for the house. For example, skip the vacation, drive the old car for one more year, initially not buy the Weber grill (these are just examples).

So fixed loan and fixed equity. Plan a low construction sum -> worse loan-to-value ratio, plan a higher construction sum -> better loan-to-value ratio. Or do I still have a conceptual error there?

Now we got it... It is common practice that the equity you have specified to the bank for your loan is used up first. That means you cannot withhold equity. Because the loan disbursement only occurs when your equity is used up.

EDIT:
If everything becomes more expensive and you have possibly kept a €20k buffer and include it, nothing will change in the loan-to-value ratio during the construction phase.

Now we have it... It is standard practice that the equity you have declared to the bank for your loan collateral is used up first. That means you cannot withhold equity. Because the loan disbursement only takes place once your equity is used up. EDIT: If everything becomes more expensive and you may still have kept back a €20k buffer and include it, nothing will change regarding the loan-to-value ratio during the construction phase.

This is valuable information. I was not aware that all declared equity must be used up. That answers my question, thank you very much! This naturally makes the division between equity to be contributed and equity as a buffer all the more important. Especially if that causes you to be over or under the 60% loan-to-value ratio. But of course it is essential to have sufficient buffer.

That is valuable information. I was not aware that the entire specified equity must be used up. That answers my question, thank you very much!

This naturally makes the division into equity to be contributed and equity as a buffer all the more important. Especially if this causes you to end up above or below the 60% loan-to-value ratio. But of course, it is essential to have a sufficient buffer.

Therefore, go to the broker. That is not your job.

Because the loan is only disbursed once your equity is used up.

However, this is not correct - with Allianz, you can also have the loan disbursed first and hold back your equity.

Exactly one thing happens afterwards: namely nothing! Neither positive nor negative for you. Once the contract is signed, it applies to both parties (except see post from HilfeHilfe – but then a lot would have to happen and the interest rate is not adjusted, rather the bank is entitled to an improvement of collateral or a right of termination).

The loan-to-value ratio will not be touched afterward. The bank has already refinanced itself and provided you with a loan agreement on this basis. You have to deal with that. The loan-to-value ratio is a sustainable value that is not just changed because of a few euros.

Exactly, all the more important to select or have selected the bank in advance (broker) that achieves the best conditions, so that the suit fits afterward when it can no longer be exchanged.

I don’t see a problem here either; by the way, there can be banks that offer better conditions at a 63% maturity and are sufficient than other banks at 50%.

Everything stands and falls with the preparation of the starting position and the presentation of the total acquisition costs with reference to and knowledge of the banks’ disclosure criteria. A house bank, a commercial bank will usually not do this for the consumer, let alone use and offer the conditions of competitors. Zaba has already shown the first approach to design possibilities here, and an experienced, reputable, and independent financing broker – whose service costs nothing – plays the full scale regarding disclosure criteria and bank conditions in cooperation with the consumer and in their interests, claims, and wishes up and down.