Additional costs for basement instead of floor slab

  • Erstellt am 2012-05-30 15:26:34

phobos

2012-05-30 15:26:34
  • #1
Hi!

As far as I understand now, for a new building (FH) I need an insulated floor slab or a basement.
With the basement, there is a utility or a living basement.

Question regarding this:
Where are the price differences between:
-floor slab
-utility basement
-living basement
plus earthworks

Can someone explain this to me?

Regards
phobos
 

Der Da

2012-05-30 22:59:51
  • #2
Very difficult topic, that's why you won't find anything concrete about it on the internet.

The pricing is tiered as follows: slab foundation, utility basement, living basement.

With a living basement, you usually don't have to dig as deep into the ground and thus have lower costs for disposing of the excavated soil. BUT this advantage is quickly offset by more expensive windows, heating, and insulation. If you plan with a KfW loan, you have to fulfill additional requirements for the living basement (which gets expensive).

No one can quantify the costs of earthworks until you have a soil report. Only then do you know on what ground you are building or founding. The costs for earthworks are the most exciting part of the whole house construction.

We are building with a slab foundation. We have a relatively flat plot and initially estimated about 5,000 € for earthworks. Well, now our hope is that it won't exceed 15,000 €. We have to partly fill up to 1m with gravel. With the naked eye and little expertise, you don’t see the 0.7% slope on the plot. I thought a bit of gravel on top and it would be fine.

A basement can cost anything from 30,000 to 70,000 depending on the soil and whether you need a "white tank" or have to get rid of water in some other way. If your soil is hard rock, it gets more expensive; if your soil does not carry, it gets more expensive. If you are not sure, I would have a soil report made and then get several offers from basement construction companies for a 10x10m house on your plot. That way you see where the journey could go.

We have consciously decided against a basement because nowadays you really don’t need one anymore. The heating and building technology is small enough to accommodate in a 4-8 sqm room on the ground floor. Instead, we invested in more ground area for the house and a larger garage.

I hope this helps you a little.
 

perlenmann

2012-05-31 07:49:21
  • #3
Hello, derDa is right, no numbers without a soil survey. And you always need the foundation slab, either under the basement or directly under the house! With a residential basement, it also comes into play that installations flush-mounted, for example, escape routes must then (if I'm not mistaken) also be taken into account. And a basement is still useful today! I think it's cool to go down into the basement with the temperatures! My food likes it there too! I have no space for the building services above ground, because I am not allowed to build bigger than my development plan allows...
 

phobos

2012-05-31 08:02:20
  • #4
Hi Der Da,

and whether you were able to help me further. I find your explanations extremely insightful! I have not found anything similar on the WWW.
Thank you very much for that.

So the total price depends on the soil conditions. Ok.
From whom can one have such a soil survey done and what does it roughly cost?

You write that a basement can cost 30 to 70 k€, but not how the price difference between slab foundation, utility basement, and living basement is.
That was what my question referred to.
Of course, one cannot give an exact amount. But an estimate of the additional costs in percent would already help me.
For example, assuming slab foundation including earthworks costs 15 k€; utility basement twice as much and living basement 3 times as much.
Such a breakdown would already help me.

Regards
phobos
 

BratacDD

2012-05-31 09:34:34
  • #5
Hello,

such an estimate is, as already mentioned above, not possible (topic: soil conditions). It can well be that a shallow foundation is very complex due to unfavorable soil properties. And when building a basement with a foundation about 2.5m deeper, much more load-bearing soil is found. If you subtract deeper soil disturbances, which generally make construction very expensive, the soil the deeper you go becomes always better (more load-bearing).

Best regards

Bratac
 

Der Da

2012-05-31 10:01:28
  • #6
I cannot estimate the costs more precisely. The foundation slab is included in the house price for us. And we are not building a basement.
 

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