Costs of earth excavation/basement construction (Rhein-Sieg-Kreis) NRW

Hello everyone,

we are still undecided whether we want/can build with or without a basement. The reason for this is significantly different price estimates from various consultants and "advisors" from our private circle, especially regarding the costs of earthworks, as from about 2 m depth the soil class 7 (compact rock/sandstone from the Devonian) was encountered here.

Maybe you have an opinion/experience regarding the cost of earthworks (excavation and removal to the landfill)?? Here are the data from the soil report:

Construction site: Rhein-Sieg district (60 km east of Cologne) Ground area ground floor: 10m x 11m up to 0.3m depth: soil class 1/topsoil 0.3m to 1.2m depth: sandy silts (soil classes 2-4) 1.2m to 1.8m depth: soil class 5 clay and rock debris 1.8m to 2.00m depth: soil class 6 weathered rock from 2.00m depth: transition from soil class 6 to soil class 7 compact rock

The foundation level is supposed to be at -3.20m, so in weathered rock/rock

Regards and thanks

Project 2012

Hello,

Maybe you have an opinion/experience regarding the cost of earthworks (excavation and removal to landfill)?? ... The foundation slab is supposed to be at -3.20m, so in weathered rock/rock

We are currently building in Hennef as well as Troisdorf; excavation, transport, and landfill costs were €12.50/cbm last October under "normal" soil conditions.

If you want to build with a basement, I can only strongly recommend getting a detailed offer for the earthworks. If you don't have a civil engineer at hand, I can gladly recommend one from Rösrath.

It's difficult to impossible to give a figure here because in deeper layers heavy equipment will probably have to be used. However, I can well imagine that in my opinion you will have to calculate about half the price of the basement again on top for the necessary earthworks; not every civil engineer has the heavy equipment because these machines cost a lot of money.

Kind regards

Hello,

für Tipps/Empfehlungen bin ich immer dankbar, also nehme ich den Hinweis auf den Rösrather Unternehmer gerne entgegen....

Contact me via email (through my profile here) and then I will give you his address; of course I would like to know from you who I am dealing with

Keller soll laut Bodengutachten mit weißer Wanne gebaut werden....ich rechne da mal allein mit 50 -60 TEUR, oder???

Real white tub hardly, that would be a "basement within basement" system, even if nowadays hardly anyone knows that; you probably mean an additional sealing. With 10 x 11, 50-55 thousand euros including sealing against seepage water or rising damp should be realistic.

zwei kleine Nachfragen:

1) Ist ein Kostenvoranschlag/Angebot bei dem Rösrather Unternehmer kostenpflichtig und falls ja, in welcher Höhe?

No, that would be new to me that it should be chargeable. He will look at the plot, want the soil survey or excerpts from it from you and then make you an offer.

Was bzw. welche Bodenklassen verbergen sich hinter den von Dir genannten "normalen Bodenverhältnissen"?

The usual "suspects" soil classes 3 - 5.

Kind regards

What exact information would you need about me??

"A real white tank hardly, that would be a 'basement within a basement' system, even if nowadays hardly anyone knows that; you probably mean an additional sealing."

You would have to briefly explain the (real white tank) to me once more as a layperson. In the expert report it says: "In the case of a basement, groundwater layers are to be expected, and construction against externally pressing water and rising seepage water with appropriate buoyancy protection is necessary. This can be done as a 'white tank' or a seal according to DIN 18195 T6...."
What costs are associated with the described variant compared to the "real white tank"?

Regards

Hello,

What exact information do you need about me??

What your "real" name is and where you live, so I can tell my friend Tiefbauer who is contacting him

As a layman, could you please briefly explain the (real white bathtub) to me once again in a bit more detail.

The term "white bathtub" originally comes from railway language. A real white bathtub – meaning originally – meant "basement within a basement". A masonry wall was built and behind it another masonry wall...

The expert report says about this: "In the case of a basement, groundwater layers must be expected, and construction against externally pressing water and ascending seepage water with appropriate uplift protection is required. This can be done as a "white bathtub" or a waterproofing according to DIN 18195 T6...."
What costs are associated with the described variant compared to the "real white bathtub"?

Today, "white bathtub" means a basement that is waterproof (concrete basement made of waterproof concrete) and additionally – as in your case – receives an "extra waterproofing" (here against groundwater layers). In your case, it must be a waterproof concrete basement (which is normally cost-neutral compared to a masonry basement). For 10.00 x 11.00, the additional waterproofing/taping against pressing water should cost about EUR 5,000 - 6,000.

Kind regards

Sorry for the slightly late reply! The basement is off the table for now, since until now 2 prefabricated construction companies estimated costs here of about 50,000 to 60,000 euros for the waterproof structure with interior finishing and another approx. 20,000 euros for the excavation including soil class 6/7. And the 80,000-85,000 euros is a bit too much for us.... Best regards Project 2012