I basically think that the regional rental prices and the cost development of the land are also relevant here and you have to consider various factors.
For example, we with two children would pay at least 300 more per month if we move - which will be in 3 years at the latest - rather more.
Here we do not even remotely reach the living standard like with the upcoming house construction.
The rent for this would certainly be significantly higher than the loan installment.
We would also have liked to have built up more reserves, but now we have received a discounted plot of land in the new development area, which is without alternative in our region.
I also don't have to tear apart our son including his circle of friends - although children here are not as inflexible as we are.
If the land prices are still reasonable with you it may be different...