20 or 30 years financing?

We want to start our house construction project soon and are now in the final phase of financing.
I’ll lay out our facts:
Calculated total amount 380,000 EUR
Equity 200,000 EUR
KFW70 (subsidy program) 50,000 EUR (1.41% effective interest)
Loan 130,000 EUR
Our monthly loan burden should not exceed 800 euros. We need 175 euros for the KFW loan, so 625 euros remain for the bank loan.
Given the current interest rate situation, we place particular importance on a long-term fixed interest rate.
For the 130,000 euro loan, these two options are interesting to us:
20 years nominal interest: 3.35% / effective 3.4%
30 years nominal interest: 3.45% / effective 3.51%
Although we probably won’t need 30 years to pay off, 20 years will not be enough without special repayments.
This way we would be secured for a small amount over the full term, although I assume that we will be able to make special repayments now and then.
How would you decide?

Have you ever calculated the difference in euros per month? The greater security costs 10 euros per month. For me, the answer to your question is quite simple ---> Zinsfestschreibung 30 Jahre

Our house bank currently offers this for

20 years. Nominal interest rate: 2.98% / effective 3.05%

.

Hello clueless,

with your high equity capital, you are welcome at every bank.
Our house bank offers the same conditions as with Kerryman76...
therefore you should definitely renegotiate.

Regards EarlGrey

@ Nordanney: Thanks for your assessment, I actually see it that way too

@kerryman / EarlGrey: Your interest rates are really another level lower! Which bank are you with?

This is currently the offer from my local Sparkasse. 20 years at an effective interest rate of 3.05%. However, we only get 3.15% because we do not meet the 40% equity hurdle. But we have not negotiated yet. :-)

Best regards EarlGrey