House sale - New construction - Bank plays along - Risk?

Thank you, but let's please switch to solution mode. Our neighbors have also all built on one street, and it doesn't seem to bother them. So there are also people for whom it doesn't matter much.

On the other hand: what would be a plausible reason for you to sell? I mean, the chance for the employer to go abroad would also be a reason to sell. And a plausible one.

A real noise barrier quickly costs 20k and more. That money is also lost afterward if it’s not as we imagine...

just try it out and invent your own reasons

Just say that you simply don't like the house as it is and that you foolishly planned past your needs. That is broadly true anyway.