Differences in basement costs?

Hello again,

I have another question about the topic of basements, more precisely their costs. I was surprised at how much the price quotes vary. They ranged from 28TE to 65TE, with it being emphasized that double-wall elements are used at the latter price. Now I wonder, where is the huge advantage for the huge price and why are there such extreme differences at all? (What are these justified by??)

Hello,

I have another question regarding cellars, more specifically their costs. I was surprised at how much the price estimates vary. They ranged from 28,000 to 65,000, with it being emphasized that the latter price includes the use of double-wall elements. Now I wonder, where is the huge advantage in the enormous price and why are there such extreme differences at all? (What are these justified by??)

There are cheap providers who "beautify" the cellar price by calculating only the walls, meaning: without light shafts, without electricity, and without interior doors. In the same way, there are outliers upwards – where everything necessary is included in the price, sometimes even floating screed throughout the entire cellar.

Each provider works with different craftsmen, so sometimes – if the soil conditions allow – the cellar can be built with masonry. Others offer cellars in sandwich construction, so-called double-wall elements. This has, in my opinion, become mostly established because not every builder is capable of properly sealing a cellar, it is faster, or simply to avoid complaints about water pressure from the ground causing defects.

A realistic price for a utility cellar for a house size of 11 x 11 meters is EUR 45,000, for a semi-detached house size of 6 x 12 meters is EUR 35,000. I consider all figures below that to be rather unreliable; upwards it is always possible.

Kind regards

Ok, I have received a few concrete details here and wanted an independent opinion on the offered package, because it tells me very little... (I'll write down some things, I hope I don't forget anything important, but copying everything 1:1 is a bit too much for me):

Basement for detached single-family house approx. 10x13m

- Foundation is executed with a floor slab (up to 25cm). Reinforcement, foundation earth electrode and connection reinforcement of the double-shell exterior walls included (steel content 18kg/m², quality C25/30)

- Exterior walls (double wall elements, steel 10kg/m², quality C25/30 X C 4XF1) with in-situ concrete core approx. 25cm thick, smooth formwork on both sides. Element joints are shear-resistantly connected with reinforcement cages. Connection reinforcement of the double-shell exterior walls with the floor slab and the basement ceiling. The outer exterior wall shell is extended up to the top edge of the basement ceiling -> concealed connection joint between basement ceiling and exterior wall.

- Basement storey height 2.60m

- Interior walls (steel 6kg/m², quality C25/30) 12cm thick. One side smooth formwork, the other neatly coated.

- 5 recess bodies included in the base price (1x chimney, 4x house installation)

- Basement ceiling made of large-format reinforced concrete slabs receives a topping after installation, total thickness 18cm. Bottom layer smooth formwork, installation joints remain visible (12kg/m², C25/30)

- 5 years warranty for the basement's tightness against ground moisture

- The basement rooms receive an approx. 4cm thick screed on a separation layer

- Interior doors made of double-sided galvanized steel sheet, door leaves embedded in continuous steel frame with rubber sealing profile (incl. lock and fittings)

- Basement windows in all rooms (except heating room) 100 x 75cm in thermally insulated frames. Light well 100 x 130 x 40, PVC with burglary-proof grille cover.

- Incl. specialized site management, static calculations, production and installation plans, site setup and grid framework, as well as basic cleaning.

Costs approx. 65k EUR (possibly more if further equipment is desired)

Now I'm curious about opinions...

Hello,

Basement for detached single-family house approx. 10x13m … costs approx. 65 TE

As I already wrote, there is always room for improvement At that price, the galvanized steel sheet doors would bother me, definitely the low screed thickness; my opinion.

I am also curious about the further responses from the “colleagues”/users here in the forum.

Kind regards

I am also curious about the further responses of the "colleagues"/users here in the forum.

more likely a sentence with X