Question regarding the feasibility of financing

Hello everyone,
my wife and I are just starting to seriously get into planning our own home and want to inform ourselves early about as many factors as possible.

There are a few things I have noticed in the forum that surprise me. I would like to ask a few quick questions about them.

Overall, I mostly see construction cost calculations here of a maximum of 400-500 k€ including land. My impression from the markets in the cities of Bavaria is more in the range of around 800 €/sqm land price and on top of that at least 500 k€ for a "normal" 150 sqm house. This is completely contrary to the calculations and plans here, where 150-200 sqm houses with land do not cost 500 k€.
Are the internet prices for cities like Ingolstadt really that exaggerated, or is the share of private builders in cities rather small in the forum so that the examples get lost?

But the reason I am actually posting in this subforum:
I find that most people here actually earn very well. A combined net income of 5000€ per month would actually be considered high earners for many. Or in other words: the solidarity surcharge (Soli) still applies unless you are married.

Nevertheless, installment payments of 1500 €/month are more or less seen as an upper limit here. I think I have been calculating too naively so far. Please help me find my error in thinking:
Let's assume 5000 net per month. Rent so far 1000 € per month. Why then is 1500 € the upper limit or "steep"?

I would think that with 1500 € warm rent per month and about 1500 € for food, petrol etc. etc., one could still put aside about 2000 € per month even while renting. Maybe more with only one car and a frugal lifestyle (which is often mentioned here).

Wouldn't that then be 2000 € + 1000 € from the saved cold rent and thus up to 3000 € per month? Maybe even 3500 €? Of course less with a child. What do you calculate there? 1000 € per month or do you deduct even more?

By the way, I do not doubt the correctness of your expertise, but rather the correctness of my calculations/thoughts!

Best regards
Matthias

Addendum to my train of thought: If you currently pay 1000 € cold rent and do so for 30 years (rental prices are more likely to rise), then you have already paid back 360 k€ from the savings on rent. And that without any additional burden.

You should also plan for additional costs and a small amount for reserves for the house (initially rather special wishes for the garden, etc.). For this, I would calculate a flat rate of 2 euros additional costs per sqm of living space and 1 euro reserve per sqm of living space.
As a homeowner, you should also additionally factor in a small other savings rate from income, whether for vacation, replacements for household items, etc. After all, you want to have saved up for a new car as well.
I would set the possible house installment in such a way that you can cover a few months of short-time work (which is currently relevant), unemployment, or parental leave on one of the two incomes.
If you then personally think that you could actually pay off more monthly, you should set aside this money and make a corresponding annual special repayment. So, conclude the loan agreement with an adequately sufficient option for special repayment.
Otherwise, of course, you are right that the total costs of a construction project can vary greatly from region to region. Usually expensive in the outskirts of real large cities as well as in the vicinity of attractive employers. Here, it is mainly the land prices that show the large differences. The actual construction costs do not differ quite as much.
If you compare forum posts here, about 3 to 4 years ago a rough ballpark figure of 1600 to 1800 euros construction costs per sqm of living space plus basement (if wanted) was estimated as a rough first calculation.
Today, that is already 2000 to 2200 euros/sqm for the standard. And, as we all know, upwards there are no limits depending on wishes.
Your quoted 500 thousand euros for about 150 sqm is probably already above standard, or you would have to know what you include in that.

Existing buildings (old and renovation) and new construction differ in price. And if you want to finance hardly any equity with 5000 net from 500k, nonsense. There is a lot of wishful thinking going on. The fitness contract is then simply canceled after 3 months and future events juggled.

Existing property (old and renovation) and new construction are a price difference. And if you want to finance from 500k with a net income of 5000, that’s nonsense.

Hello, thanks for your answer. Unfortunately, I did not quite understand the second sentence.
Existing property and new construction hardly seem to make a difference here. It feels like both usually cost about 1 million euros all in.
But that is only an estimate based on real estate agent information and stories from friends who have lived here for a long time.

You should also plan for additional costs and a small amount for reserves for the house (initially rather special wishes for the garden etc.). I would calculate a flat rate of 2 euros additional costs per sqm of living space and 1 euro reserve per sqm of living space.
...
Your quoted 500 thousand euros for approx. 150 sqm should already be above standard, or you would have to know what is included in that.

Thanks for your post. It contains many points of reference for me. By the way, 500k€ was meant to be too low for 150 sqm in this area. You supposedly have to calculate from 800k€. More likely more. Both for new construction and existing property.
That is also why I am puzzled about the repayment calculations. Sure, many also earn a lot. But that people here on average earn 10,000 net so that they can afford a house is hard for me to believe.
So it sounds like many here make a too naive calculation (like I originally did) or have inherited a lot. Otherwise, such prices are basically not financeable.

I believe one should detach from absolute amounts in this discussion. As far as I understand, regarding a rate, an annuity of around 5% is quite healthy when it comes to repayment over a manageable period of 20-30 years. The max. €1500 is often set out of habit against the cold rent (and people forget that the monthly additional costs also amount to at least €400 per month) and think that everything will be fine with nicely calculated special repayment payments. That is mostly not the case. We are already at an annuity of 4.67%, of which 3% is repayment. That makes €1605 + €400-450 additional costs. The loan is at €418k.

Calculate the 5% with additional costs and your loan amount yourself. I bet you that you will end up somewhere around your €3000. Assuming a household income of €5500, only €2500 remains for everything else with a fictitious 2 children, which is okay, but you cannot pull out all the stops as before with a warm rent of €1500, and reserves for the house have not yet been built.