Additional costs for white tank

Hello experts, I have already worked through the relevant threads on the topic. We want to buy a plot of land with a slight slope. According to the soil report from the development of the building area, slightly stony subsoil without groundwater is to be expected. I will now have 2-3 test pits with reports done in advance of the land purchase. The soil surveyor who examined the area for the municipality back then (1992) said that groundwater etc. was not a problem at that time. However, changes can occur from plot to plot here. Only 10 km as the crow flies away in the commercial area (also at the top of a slope) pressing groundwater was suddenly discovered at a depth of 3 meters from the turf, 100 m further suddenly rocky soil at 1 m depth.

Just in case, if there should be a problem with groundwater, what additional costs for a waterproof basement instead of a masonry basement (30 cm Poroton) can I expect? The base area of the house will be approximately 9x9m.

Thank you very much

Hello,

Just in case, if there should be a problem with groundwater, what additional costs for a WW instead of a masonry basement (30er Poroton) can I expect? The floor area of the house will be approximately 9x9m.

You probably mean a basement made of WU concrete (waterproof concrete)?

In recent years in the industry, it has become common to refer to WU concrete as a "white" tank, although this is not really accurate, as the term "white tank" originally comes from the railway environment and correctly refers to a "basement within a basement."

In a basement made of WU concrete, the floor slab and the exterior walls are constructed as a closed "tank" made of concrete with high resistance to water penetration; it is usually built floor-high, either from in-situ concrete with system formwork or from prefabricated elements (triple walls). The extra cost for the basement size you mentioned is likely to be in the range of EUR 5,500 to 6,500.

Kind regards

So for me, the white tank was standard and nothing else was even offered, and yet it was cheaper than others...

Hello,

For me, the white tub was standard and nothing else was offered, and yet it was cheaper than others...

Many providers have now switched for various reasons – which does not necessarily mean that it is always sensible for the builder.

Whether your waterproof concrete cellar was actually cheaper (cheaper compared to which option?) I cannot judge as an outsider, since I do not know your provider’s overall calculation.

Kind regards

White tank is the most cost-effective, followed by brown tank. Black tank is usually the most expensive. approx. 35% !

See also the surveys of the German Engineer Journal.

Does anyone here know the costs for a white bathtub / basement made of WU concrete in the size 11 x 10 m?

I already have two offers:

one 43,000
and 53,000

how can such differences arise?
And which price is reasonable or what should one expect?

Maya