Construction costs are currently skyrocketing

Too bad, I just imagined how you fought your way to the top and practically established a dictatorship with free ogorki kisone for your friends... The brine is probably also good for treating fresh wounds.
And the bottom of the drum is, of course, the lid of a huge cucumber barrel.

I just received the offer for the earthworks and was shocked at how much the costs exceed the plan.

Removing 250m3 topsoil, excavating 120m3 for the house, and placing 390t of basalt gravel + laying rainwater and wastewater pipes is supposed to cost 33,000 EUR including VAT. There is no soil disposal included...

Do you think this is realistic?

Sounds high to me. Is that broken down by item?
I just have no idea how much basalt gravel costs. Is it really necessary? Under my house, they simply used gravel and for the driveway RC gravel.

General consensus, 14.5k gross okay? Five words are missing

Removing 250m3 of topsoil, excavating 120m3 of earth for the house, and placing 390t of basalt chippings + laying rainwater and sewage pipes is supposed to cost 33,000 EUR including VAT. Earth removal is not included...

Do you have a breakdown for the positions? So 390t of basalt chippings alone already costs around 8,000 euros. Without the transport costs of maybe 20 trips... depends on the distances. The rest also depends on what kind of distances we're talking about here, maybe a cul-de-sac property?

Swarm opinion, 14.5k gross okay? Five words are missing

That is, I think, the price one has to pay on average for it nowadays. It might be cheaper, but it is often significantly more expensive.

Do you have a breakdown for the items? So 390t of basalt gravel alone is already around 8000 euros. Without the transportation costs of maybe 20 trips... depends on the distances though. The rest also depends on what distances we're talking about, possibly a dead-end property?

The property is located in a dead-end street. The gravel is probably reasonable but the prices for the pipes seem clearly too high to me.

Yes, in my opinion these are expensive individual prices and flat rates for the work. Which region?