New construction - Is it advisable to lay basement tiles immediately? (Moisture)

There is no underfloor heating in the basement. In the [EG], [1. OG] and [DG] there is. So [EG], [1. OG] and [DG] can basically start tiling immediately after heating up and key handover. The basement must be worked on with a dehumidifier for about 1-3 weeks until it is dry.

when everything is empty without furniture, we preferred to lay the tiles right at the beginning. Later with furniture and small children, it is difficult.

Of course, it would be nicer if you finish it right away. But what isn't, isn't. You’ll ruin everything, including the furniture, if you seal the surfaces prematurely.

You all want to lay the tiles in the basement yourselves? The tiler from the ground and upper floors should measure your screed. Politely ask and slip him a tenner. Then he can give you one or two pieces of advice.

No, the tiler should also do the basement. They want to measure beforehand. If they say it is dry, they can start. If not, it still needs to dry a bit.