The low interest rates are rather counterproductive for homebuilders, at least in the greater Munich area. I bought for 900 euros/sqm three years ago (from equity, which the bank then credited as 600 euros/sqm of equity for the home loan (fixed for 10 years at 1.9% back then) due to the price bubble at the time), and now the neighboring plot went for just under 1500 euros/sqm. More than a 60% price increase for the interest rate having fallen by another 1% since then – and construction costs have also risen significantly. For potential builders, this is more of a disaster... Our new neighbor's budget for a single-family house on 500sqm of land will probably be over 1.3 million... - that would be economically irrational even on credit at 1.75% interest and can only be explained by the fact that there is so much money available here in the South, desperately searching for investment opportunities even at zero returns.
Paying off 720 thousand euros over 25 years at that interest rate with regular special repayments will ultimately cost you about 3000 euros/month for 25 years – a lot of money for a semi-detached house (160sqm?), especially since your equity is already included there. Personally, I would always draw the line somewhere at three to a maximum of four times gross annual income and a sustainably affordable annuity of at least 6% (previously 4% interest plus 2% repayment, today 1.5% interest and 4.5% repayment, which surely also depends somewhat on age). Otherwise, the risk would be too high for me compared to the undoubtedly existing benefits of homeownership – and since the semi-detached houses in our area are slowly exceeding the 1 million euro mark, I would probably rent again nowadays and invest the equity diversified in dividend stocks.