Did you consider zwave? All in all, if it is a new house, I suppose you are not only controlling your downlights? Using a mesh solution might be more robust, especially if you are installing old fashioned switches for local control.
I use Qubino Flush dimmers (with a separate/standard face plate), but I guess there are others as well. The thing with LED’s is that if there’s a lot of them, apparently the starting current can be higher than anticipated, so if you are intending to drive a lot ol LED’s on the same dimmer, you will have to be careful.
There are of course also the possibility to go 0-10V to a external dimmer, but at a higher cost. It all depends on your set-up really…
With the Qubino above or with the fibaro dimmer 2 you can use any faceplate you want. These modules get inside the the wall switch box so that you can operate the lights either via home automation or simply with the switch connected to them
If this is about a low watt LED along with fibaro you may want to use this along with fibaro dimmer bypass that is used as a dummy load.
Of course if you do not have zwave you also need to purchase a zwave gateway
zwave is not considered cheap but is very stable and scalable mesh network. I run a lot of my home automation via zwave devices among other things
you are right it does consume but then again any dimmer module you will put (be it zwave / wifi etc) will also consume some energy if you want to control the lights remotely. the bypass consumes less than 1.4W according to docs so it is not that much (but it is not 0)