ᐅ Rainwater drainage with or without flushing chambers

The soil report states that drainage according to DIN 4095 is necessary if the basement is not built as a waterproof structure. The general contractor (GC) also received the soil report in advance. The contract confirmation also specifies that the soil report will be incorporated into the structural calculations.

Now we have received an additional offer for €2,500 for the proper installation of drainage. I am wondering if I am required to pay this, considering that the GC should have known from the soil report that drainage according to DIN standards was necessary.

wanderjupp schrieb:


Now we have also received an additional offer of €2500 to install the professional drainage system. I wonder if I have to pay this when the general contractor should have known, according to the soil report, that the drainage must be built according to DIN standards.

Were the inspection shafts mentioned and listed in the initial offer?

ypg schrieb:
Were the flushing shafts mentioned and listed in the first offer?

No, only drainage was mentioned. In my opinion, flushing shafts are essential for a drainage system to function properly over the long term. Also, there are no documents regarding the planning (e.g., the slope).

wanderjupp schrieb:
No, only a drainage system was mentioned. In my opinion, a permanently functional drainage system requires access shafts for flushing. Also, there are no documents regarding the planning (e.g., the slope).

Well, then you'll have an additional cost of 2,500 €.

If I order a kitchen and receive an offer, it will be delivered at some point. Even if I believe that installation should be included with the kitchen delivery, I can't be surprised if the company refers to the offer where installation is not listed. Otherwise, everything else is itemized separately.

That’s my opinion on the matter—even if it’s painful.

ypg schrieb:
Well, then you’re looking at an additional €2500.

If I order a kitchen, I receive a quote, and it will be delivered at some point. And even if I believe that assembly should be included with the kitchen delivery, I can’t be surprised if the contractor refers to the offer, where assembly is not listed. Everything else is itemized separately anyway.

That’s my opinion—even if it’s hard to accept.

That’s one way to look at it. However, I wouldn’t buy a new car that definitely can’t pass the inspection because it’s missing the brakes.

My quote includes “drainage.” It has to be functional, but it won’t be in the long run without inspection chambers.

wanderjupp schrieb:
My quote includes "drainage." It needs to be functional, but without access chambers for flushing, it won’t remain so in the long term.

That is your perspective.

The car with missing brakes is a poorly chosen example.