Financing a single-family home solidly?

Good morning,

I am diligently reading but now our house building project is coming up soon and I wanted to get your opinion on the financing.

General information about you:
How old are you? Both 36
Do you have children? Yes 1 (6)
Are more children planned? No
Both employed
How many hours do you work?
30 & 37.5
Income and asset situation:
What income do you have (gross/net)?
Together net 4800
How much child benefit do you receive?
200
Other transfer payments such as parental allowance, sick pay, etc...? No
How much equity do you have? 200000
How much equity do you want to put into the house project? Actually all but 150000 into the financing and 50000 as a buffer.

Above is an overview about us. The total volume of the house construction is 550000, which includes everything except the outdoor facilities. We want to include 150000 of the equity in the financing. That leaves 400k to finance, with a KFW subsidy still to come. However, this has to be financed initially. So around 370000 remain to be paid off. We aim for a term of 20 years and a low rate (1000-1200) because we are more the ones making extra repayments. The plan is to use about 5k annually as extra repayment. What do you think? Is the financing healthy?

Thank you very much!

Where do you see a problem? Are nearly €4,000 monthly for your life (and the additional costs for the house) not enough for you? I seriously do not understand the question.

You are doing well in life. Should be fine. Is the equity capital saved up by yourself?

Have almost the same constellation (house is cheaper with us) and we sleep very well with it! Installment + additional costs correspond to about the current warm rent with us, whereas the rent automatically increases according to the contract – the installment does not at first. :-)

What are you worried about?

You are established in life. Should fit. Is the equity self-saved?

Yes, it is self-saved. Although not much happened in the first 2-3 years after the child. In recent years, we were able to do quite a bit.

We have almost the same setup (the house is cheaper for us) and we sleep very well with it! The installment + additional costs roughly correspond to our current warm rent, whereas the rent automatically increases by contract – the installment does not at first. :-)

what are you worried about?

I wrote this because of the total amount. I have never had so much debt in my life, let alone thought about it. But if it seems healthy, then we will probably do it that way :)