But you do realize that tiles may require different build heights than laminate, and that this may need to be taken into account with the stairs to avoid half-centimeter steps at the transition?
Tiles and laminate are currently very similar, if not identical, in handling RFB vs. finished flooring. He probably will not want to lay the thickest terrace tiles for outdoors or the thinnest DIY store laminate. Therefore, 1cm is a good starting point for him. The rest must be compensated for by the tile bed thickness or impact sound insulation.
You always work 100% for yourself. That compensates for a lot in quality! Many craftsmen currently only want to earn (a lot of) money, the rest doesn't matter to them at all. Of course, as a layman, it always takes at least twice as long, that's clear.