Drainage office requests proof from inspector

Uhh ... why did you already start BEFORE the building permit was issued?

You can certainly deviate from the plan in some points, but in some cases you may have to have this deviation approved again.

We have not started yet. But the civil engineer has taken a look at the location on site...

Then tell him to build as approved or coordinate it himself with the building authority.

If it were that easy. OK, I'll start off: I didn’t know as much about the planning back then as I do today: 1. We have to let our surface water infiltrate. The plan was to connect the overflow of the cistern to a soakaway. The cistern would have been about 2 m away, the gravel soakaway about 3 m away from the house. 2. Since we have sandy soil and the basement is far above the groundwater level, we decided not to make the basement waterproof (which was also not necessary according to geological reports). Then the excavator guy came around the corner and said that with the above solution we would have a problem and the overflow from the cistern would push against the house through the backfill material (until it infiltrates). Recommendation: at least 5 m away from the house. But with the above solution we cannot go further away. That’s why the idea was either to put the cistern on the other side including the soakaway or to make the basement waterproof, which would cost about 11,000 euros. Second point, which we wanted to do differently: the architect had planned a pump for the light wells. The water from the light wells was supposed to be pumped upwards and fed into the cistern. I actually didn’t want to do that like this either. Since I am now installing drainage around the house, the light wells can be connected to the soakaway pit (which will be added additionally). I didn’t know that back then during the permit process either.

That seems to be a bit more complicated with you, but then the only option is actually to submit a revised plan and have it approved again, otherwise it will come back to bite you anyway. Of course, that could have been done right away ...

Yes, of course that could have been done directly. If you always know everything in advance. No one says on their own what makes sense and what doesn’t. Everyone only looks at their own trade. The architect, so that he can get the approval easily. That pisses me off by now. Sorry, back to topic. If I understand you correctly, it is not normal that an inspector has to approve it. OK. An expert will certainly cost me another 1000 euros.

I asked myself why they don’t come off their desks and take a look themselves. No, the client pays for it. Just the processing time at our office: submitted on 19.2., approval for the drainage trade on 29.7.