Is it sufficient as sound insulation according to DIN4109 in a single-family house?

Hello everyone,

in the construction performance description of a potential home builder, it states that simple sound insulation according to DIN4109 will be installed.

Mr. Google says that this is the legal minimum requirement and not really great. The question is whether this is actually sufficient in practice? We want a 140 sqm city villa with currently one small child.

How should this be formulated in the construction performance description if we want better sound insulation? Are there "better" DIN standards? Do construction companies even offer this, or are they already fixed with their construction method (here lightweight expanded clay aggregate from prefabricated parts)?

Many thanks!

Sufficient, but much more important is the correct execution of the trades. Decoupling screed, sensible floor plan with a few more doors and without open galleries, etc. Then properly plan the water pipes and, if necessary, have them wrapped in sound insulation and that's that.

Low costs but good planning!

Ok thanks for the feedback.

So that means as the client I can't do anything about it now and just have to hope that the work is carried out correctly? I can't specify anything concrete in the contract? One assumes that the work will simply be carried out correctly, I don't need to include that specifically in a construction contract...

That the work is simply carried out correctly is a given; I don’t need to explicitly include that in a construction contract...

This is a reassurance for your home builder. 4109 has not been state of the art for more than 10 years. If no agreement on the required minimum sound insulation had been made in the construction specifications, simply 4109 alone would already be a defect, see various BGH rulings.

It would be better to use DIN 4109 Supplement 2, VDI 4100:2007 SST I-III, or VDI 4100 SST I-III.

Although I actually find DIN 4109 completely unproblematic in single-family houses as long as external noise (rail, road, industry) is not unusually high.

Have you commissioned an expert to regularly check your construction for correctness?

I have just joined the Bauherren-Schutzbund and would hire a consultant from there.

The contract arrangement currently looks like this: we will have only the shell construction done by one company and hire and coordinate the individual trades through a construction supervisor who has already built many houses in our small town.