I put "burning" in quotation marks. Of course, I understand that I also receive a consideration for it. For new construction, I have somewhat different conditions. The prices of the land will probably increase somewhat, but in the region I have in mind, it is still manageable since the prices per square meter are still below €200, meaning they probably make up only about 25-30% of the total budget. The pure construction costs increase moderately, and if I build the house in 3 years, it will then also be 3 years younger. In the case of buying used, it is currently (and certainly also in the next 5 years) such that properties increase in price by about 4-5% per year. Since many sold houses are also somewhat older, the approximately 3 years lower age usually hardly makes a difference. The overall condition or the degree of renovation is more decisive there.
Now back to my calculation:
I plan to repay about €1500 and calculate about €500 in ancillary costs (which certainly must be calculated more precisely for the selected property). That means about €2000 monthly burden over approximately 25 years (if I calculate with a loan amount of €360,000, 2% interest, and 3% repayment, I come to 24 years). If I wait 4 years to build more equity (let's say that would be enough to generate 20% equity, then with the same conditions (290,000€, 2% interest, then 4.2% repayment) I could be finished in 19 years. Effectively, I will be finished 1 year earlier, and yes, I probably would have a better interest rate then because I have more equity. With the relatively high repayment rate, however, 0.3-0.5% no longer makes such a significant difference (approximately the same term with €50 lower monthly burden). Now let's take the one year earlier repayment end, or better 1.5 years to plan safely, then I am at €1500 x 18 = €27,000 difference amount. If I now calculate that I want to save €70,000 in 4 years, that is €1450 per month, which I must pay in addition to rent, which with my €1100 warm rent is €2550, thus €550 more than the €2000 (installment + ancillary costs) for the house. €550 x 12 x 4 = €26,400. So roughly the same. Once the bank gets it, once the landlord (who is generally more likeable to me than the bank, but ultimately I am selfish there). Either I am making a complete error in calculation, or currently it really makes little difference. Of course, I must consider that I might then get better conditions, on the other hand, the houses could also become more expensive again. In the worst case, prices increase by 10%, then I must save for another 2 years. If I calculate saving €1000 per month to reach a currently comparable monthly burden, then I would already have to save 6 years and the calculation becomes even less favorable.
The number of variables is roughly the same for both options, so there is risk in both cases. On the other hand, buying now has the advantage that I can already live in the house now (more space, no other people in the house, free design, etc.) AND that the €27,000 do not have to be paid now, but first in 23 years. Of course, this is only postponing, but on the one hand, it will probably be easier in the end simply to pay one year longer, that is now to cough up €500 more every month, especially since the likelihood is high that due to inflation alone, the salary in 20 years will be significantly higher than today.
Perhaps I am now too naive, but purely from the financial aspect, it currently does not occur to me why saving equity should bring advantages, apart from the fact that in the case of a "fire sale" in the first years one would probably lose a lot. Conversely, then a large part of the equity is gone, which makes no huge difference to me.