Terrain modeling different from the building application - allowed? (NRW)

The civil engineering work will probably start in one and a half to two months. I am not sure if a supplementary claim will have been processed by then.

Or do you have any experience with that? Does a supplementary claim hold up the entire previously approved building application? Must the decision on the supplementary claim be awaited? All that is swirling around in my head.

When the basement is excavated, huge piles of earth end up back there first, and no one knows anymore where or how the original terrain was. During the cadastral survey, they also don’t take 100 additional height measurements in the garden to check the terrain.

Recommending an addendum for the garden design can only come from people who neither have to pay the architect nor the cost statement for the addendum. But I’m out now, it’s no use.

Yes, pragmatically in some areas people will just "do it simply." But since I neither live there (nor know the neighbors) nor know the building regulations in NRW in detail, I can only recommend the safe option. And an amendment for that doesn’t cost the world (if you want to be on the safe side). Or do you feel like getting a "Just do it, it’ll be fine" from anonymous advisors on the internet, only to quarrel with the neighbor for years because they don’t like your planting rings and therefore badmouth you everywhere? And yes, an approved embankment with a slope is different from planting rings with a height of 1.5m. That then falls under retaining walls. How much safety the original poster would like for themselves or what risk they are willing to take can only be decided by themselves. I can only say this here for the Hessian State Building Code: Retaining walls up to 1.5m height are exempt from approval (provided there is a reliable structural calculation). No setback areas are triggered by embankments including retaining walls up to 1m height and terraces (without area restriction) up to 1m height (including parapet 2m) §6(8). Within the setback areas up to the property boundaries, retaining walls for securing the natural terrain are permitted §6(10) without specifying a maximum height. Personally, I would just ask the local building authority (not the approving district building authority) and cautiously check how such matters are handled locally. Is there a stickler or someone who can let things slide every now and then? Here locally, I would just do it, only not with planting rings. I recommend getting a sample structural calculation from the manufacturer of the rings. They should have something like that.

The civil engineering work will probably start in one and a half to two months. I'm not sure if an addendum will be processed by then.

Or do you have any experience with this? Does an addendum hold up the entire previously approved building application? Do you have to wait for the decision on the addendum? All these things are swirling around in my head

How long the processing takes varies greatly depending on the location. In your case, I wouldn’t make the construction of the house dependent on whether the addendum for the embankment is approved or not. You will do the landscaping nicely at the end anyway, and the main thing (the house) is not even disputed. A quick phone call and asking helps here as well

Maybe "I can name building authorities for you" was a bit awkwardly phrased, because now it looks like "I can name building authorities for you, but don't do it".

Well, as I estimate , he means something different by "No, it's not" than if he had written " No, it's not "

That gives you a clear statement, even if it's not as nice for you as if he had said "Call Rudi, extension 12". That he wants to keep secret where his own house is located, I find b) understandable and a) it has not yet harmed the quality of his statements

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By the way, until now I assumed you would ask at the stage "the house is finished, can I now make the terrace wider than previously thought". Now apparently there have been no earthworks at all – how urgent is clarification there? – the area in question will be accessible for a mini-excavator later, and while you still have a pallet stair at the front, a yet not final terrace edge at the back is no shame.

By the way – but that will be easier once you are somewhat integrated at the construction site – official channels are not the only way to deal with civil servants. They also have a private life. You look in the municipal administration phone book for who is responsible; then in the "Posemuckeler Käseblatt Online": where the guy sings or shoots or bowls, what kind of letters to the editor he writes. There and at the beer fountain you quickly find out if he is a cheerful nature or a tin soldier.

So far, there have apparently been no earthworks at all – how urgent is the clarification there?

That’s right, so far it’s all still virgin terrain and everything will only start in the period from the end of February to the beginning of March. At least that is the target. However, I can’t quite follow or respond to your first part. My quote referred to naming some building authorities known to him, not to whether he knows exactly which one is responsible in our case. But let’s set that aside because: You are of course right that you can simply build the house first, move in, and then take care of the outdoor facilities later. I’m just thinking that during the initial civil engineering works, a later planned shaping of the terrain could at least be prepared. An excavator and trucks would already be on site anyway.