ᐅ Prefabricated house, poor sound insulation / high noise transmission

Hello,
I live in a prefabricated single-family house built in 2017.
Unfortunately, the walls in the house are very noisy.
For example, if you put your ear against the wall, you can hear people talking on the street. Also, when cars drive by, there is a booming sound inside the house because the exterior wall is probably too light or thin.
The exterior wall consists of 80 mm (3 inches) of polystyrene insulation panels, 12 mm (0.5 inches) OSB boards, 140 mm (5.5 inches) of interior insulation, and 12 mm (0.5 inches) gypsum fiberboards.
What options are there to have the construction company make improvements?
Would it make sense to have an acoustic report conducted?
I would appreciate any help!
Regards, theo1988

Unless otherwise specified in the contract, the IDE requirement values of the standard DIN 4109-1: Sound insulation in building construction from January 2018 apply. These refer to the minimum sound insulation in “rooms requiring protection.” These are rooms intended for permanent occupancy.

Whether the DIN standard is met can definitely only be confirmed by an expert. This expert might identify a defect if applicable.

But what exactly should the company do to fix the issue? Completely replace the facade plus install soundproof windows? That would be extremely expensive (if even feasible), so the company will likely resist to the fullest extent. Good luck!

Have you checked the windows? What you are describing applies to about 90% of houses and doesn't sound like a defect. The energy saving regulations are to blame; in the past, solid construction was common. Nowadays, it's all about thermal insulation...

Or is there a decentralized ventilation system? Also, a classic solution.

As mentioned before, sound insulation requires mass.

Bookstar schrieb:

The Energy Saving Ordinance is to blame; in the past, it was possible to build with solid construction. Nowadays, it’s all about thermal insulation...

What kind of nonsense is that again?

A house built using conventional construction methods, whether prefabricated or solid construction, does not completely block external noise inside the house. Some street noise, murmurs, or other sounds will always be audible.