What would cause me much more headaches in your place is the amount of your equity. The 20 TEUR are just 6% of your total costs (as ypg correctly pointed out, still without the outdoor facilities). You do have an above-average family income, but a total loan of 320 TEUR would clearly be too much for me.
Yes, I would also prefer more. :( We thought for a long time about whether to do it with the equity. But since I don’t assume (danger of crystal ball :) ) that prices for land and houses will fall in the next few years and a comparable plot in the region costs almost double per square meter, I am seriously wondering at the moment whether I can save against the price increase in the medium term (hopefully with stable rent) and significantly increase the equity ratio.
In a way, you are both right. Whether it really makes sense to save against the price increase, no one can tell you. However, upon rereading, I have to agree with Baumann2013. I had mistakenly overlooked the 50,000 KFW grant at the beginning and assumed a loan of €270,000. Honestly, I also find 320k to be very (for me too) much. For comparison: we have a significantly higher income than you, have two children, and our family planning is completed, and even for us 300k was absolutely the maximum pain threshold. For the reason that unforeseen events, whether a temporary unemployment, illness/sick pay, or that I may have to work part-time because of the children with correspondingly lower income, can also be compensated over a longer period without reaching the financial "throw-up limit."
Accordingly, you should carefully consider which risks you are willing to take or whether it might make more sense to wait until the child or children arrive and more equity is saved. At the moment, you are not even 30 yet, so there is certainly no reason to panic now.
Moreover, the plot is just under a kilometer from the parents. Besides the sentimental family aspect, this also has the advantage, in my opinion, that the much-discussed area of children and childcare is significantly alleviated.
You are certainly right about that. Fortunately, we also have both sets of parents nearby, so that someone can occasionally step in at short notice if a child gets sick or has to be picked up from daycare/kindergarten. That is nice and helps a lot in some situations, but we would not want to pass on general childcare to the parents (if that was meant). After all, everyone should be able to live their own life.