Is heating in the basement sensible or necessary?

Sorry for bringing up the old topic, but we are facing a similar issue:

We are currently building a new house with a relatively large basement. One area will be used exclusively for technology, storage, tools, etc. The other rooms are intended to be used in a more "livable" way (laundry room, fitness room, WC, playroom for children, etc.). Our architect advised us to install underfloor heating in the basement (at least for the livable rooms), as already done on the ground floor and upper floor. Heating is provided by an air-to-water heat pump.

Now I am wondering to what extent the basement will be heated permanently (unnecessarily?) later on or if it is possible and sensible to heat it only as needed and when in use with ERR. The problem with underfloor heating is that it is rather sluggish and cannot quickly heat a room. The alternative would be to heat the basement permanently regardless of whether the rooms are used that day or not, which, however, probably is not ecologically sensible and also rather costly.

I would appreciate experiences or advice on this.

Basement inside or outside the thermal envelope? I'm going to assume inside. Then the basement must be heated as well, because if you don't do it, your ground floor will heat your basement. This can lead to a higher required supply temperature. You don't have to heat your basement to living room temperature.

If the basement is within the thermal envelope, do everything with underfloor heating. Except for perhaps a few partial areas, in my opinion it doesn’t make sense not to cover everything. If the planning is not yet that advanced, you can consider implementing a concrete core activation for the basement floor slab, or laying the underfloor heating directly in the floor slab (also known as a "Swedish slab"). With appropriate execution, this could be almost cost-neutral, with the advantage that you can use the "storage capacity" of the floor slab for both heating and – perhaps even more interesting – for cooling.

Thank you for your feedback. Exactly, the basement is within the thermal envelope. I did not know about Schwedenplatte and unfortunately it is out, as it is already too far advanced. Then we will probably stick to installing underfloor heating everywhere except in that one area and then always maintain a certain base temperature.