After reviewing the development plan - Are soundproofing measures necessary?

Hello,
I have planned everything so far and sent all the documents to the developer.
The developer has determined that according to the development plan, appropriate soundproofing measures are required for the property.
The upgrading of the house includes a decentralized ventilation system, special soundproof windows, soundproof insulation of the roller shutter boxes, and a soundproofing expert.

Of course with additional costs.
However, I am not very satisfied with the decentralized ventilation system and consider a central ventilation system to be better.

What is your opinion?

What is your opinion?

Are you planning yourself? Who is the "developer" - a developer sells you a plot of land with a new building. A construction company (GC) builds a house on your plot - but also plans (whether well, is another question)? Why doesn't your architect notice the "problem"? Decentralized is always more prone to noise than centralized. Then you have half a dozen holes in the wall through which sound can come? Why doesn't anyone know beforehand that a flight path, a highway, or the like runs right outside the door? Why doesn't one read the development plan beforehand? My opinion? Write a detailed thread with more than just that one question. Excerpt from the development plan. Map printout. House planning. Exact constellation of who did what to whom and when. Etc. So far, I would personally only say: How stupid can you be not to look into the development plan before planning?!

I have planned everything so far

What have you planned? What is this about anyway?

I translate once:

I have planned everything so far and sent all documents to the developer.
The developer has found that corresponding sound insulation measures are required for the property according to the development plan.
The upgrade of the house includes a decentralized ventilation system, special soundproof windows, soundproof insulation of the roller shutter boxes, and a soundproofing expert.
Of course with additional costs.

probably means that the OP sent his own planning to a general contractor who provides an included approval planning and in the process has found that soundproofing requirements apply to the building plot, compliance with which must be demonstrated. Neither the necessary actual measures nor their assessment are included in his construction specification.

However, I am not very satisfied with the decentralized ventilation system and consider a central ventilation system to be better.
What is your opinion?

The GC proposes a decentralized controlled residential ventilation system – presumably because it costs him less in procurement – and the OP considers a central controlled residential ventilation system to be better. I share this opinion. Technically, a central controlled residential ventilation system has the significant advantage that heat recovery can be implemented more easily here and – assuming inclusion of all or most rooms – is also more economical in the sum of components; apparently this does not apply to the GC, who will probably offer the better solution at an additional price. The disadvantage of the central variant is the ducts that connect the islands to the system. I wrote about this almost seven years ago

It would certainly be funny to see if there is a statistic showing what market share controlled residential ventilation has among builders who are professional bar equipment cleaners

to which my opinion has not changed. However, changing the property would be cheaper than retrofitting the central variant afterwards, which is why it is better to choose it as original equipment if preferred. In this respect, the OP is in my opinion "right."

Oh dear, it seems I made a very bad start with the thread. I am trying to clarify and set everything straight. I also apologize for having incorrectly defined and applied the term "Bauträger."

I am in the process of building a 127m² bungalow with 3 rooms with a general contractor (GU). The house will be an EV40 house built with a timber frame construction. We consciously decided on a window ventilation system. We can discuss later why.

By my preliminary planning, I meant everything about financing, kitchen, floors, solar system, commissioning a soil survey, clarification whether the house fits the plot, purchase, etc.

So, after the first steps requested by the GU from me were completed, the GU reviewed my documents and found that the house must be adapted to the noise protection regulations in the development plan and informed me about it. With measures of what needs to be done and what this costs. Annoying because with all the information I had, I thought the house complied with these requirements. Okay, that's why you plan with a buffer.

Background to this noise protection regulation: In sight and estimated 150m away runs a little-used and non-electrified single-track railway line whose train I could not even hear from the property. But there is also occasionally a freight train running along that is a bit louder.

So, in these adaptation measures, the decentralized ventilation system is listed. However, before the construction meeting or sampling, I want to get a proper impression and see if this is a good solution or if a central system, despite a certain surcharge, is worth it, as I feel more positively about decentralized ventilation.

I hope I was able to set everything straight and explain it understandably. I apologize again for the confusion caused.

Regarding the situation: Please provide the name (no links!) of the development plan.

Possibly, if (hopefully) not yet signed, I would also consider another company.

With us, due to a pro forma federal road at some distance (barely used and almost only by cars, also on the other side of the settlement), noise protection measures had to be taken as well. These consisted of noise protection windows. But we planned with a classic central controlled residential ventilation system.

Now I just don't know if the problem might also lie in the originally planned ventilation here. Central window rebate ventilation is not known to me as a pure ventilation system. If so, I only know it from exhaust heat pumps like the Nibe S735.

Therefore, next question: Which ventilation was planned? And which does the general contractor want to install now?

PS: I always correct my wife to say "general contractor" or "construction company" when she says developer... she doesn't like that either...