Hello,
You want to buy a piece of a house. Although the ancillary construction costs are eliminated, still take a close look at this thread, because necessary acquisitions are also listed here:
When you buy a house from a developer, purchase-related ancillary costs arise. They amount to a five-figure sum. However, I do not find this in your calculation.
An income protection in case something unforeseen happens to the partner is done with a term life insurance. This should also be included.
I notice that calculations are made for wife and husband. Get used to sharing liabilities together. The house will belong to both of you, so the liabilities also belong to both of you together. The contents of the refrigerator are also paid for together, as well as the insurances. There is no I + You, there is a WE.
Regarding your private liabilities:
for a car, it is advised to calculate 500 per month. Besides inspections, tire changes, etc., there is also a savings rate for a new one for the future...
I also find hobby and living expenses too low. Even if you only need 300 for groceries as a couple, you are three (as I understand it), I do not see costs for drugstore items, pocket money, clothing, medicines, and gifts as well as further costs for the child (sports club, school, etc.).
I also consider 15,000 very low. Certainly, you can do painting in EL, but for material costs for flooring, at least 1/3 for skirting boards, screws, adhesives, and tools is added (see above listed thread).
Kitchen: yes, there are cheap kitchens where you can make sandwiches, but a home might want more comfort than the apartment currently lived in...
So I would calculate more sharply and realistically, nevertheless the house purchase will probably be possible.
P.S. Christmas bonus does not go into special repayments for us, but goes away for supplementary health insurance, Christmas shopping, and smaller acquisitions that you wouldn't otherwise afford for the house. It will be no different in other households.