It probably looks worse as a pile than when it is actually spread out evenly. For a 10x10m house footprint without a basement, the mentioned 40cm of topsoil applies, so about 40 cubic meters, plus the trench around the foundation, another 0.5m deep, 1m wide, 40m long (4x10m), which makes another 20 cubic meters. Part of this can possibly be reused to backfill the construction space, so in the end it is about 50 cubic meters.
Spread around the house: most plots will still have 300sqm available: that makes 17cm of soil cover. It always depends on the local conditions, but one should calmly first check whether the expensive disposal can perhaps be avoided.