How to wire my renovation

I'm renovating my house so its going back to brick so have the opportunity to go all SMART. I am willing to spend money on 'infrastructure' now knowing that I can change most other things later on. I was originally going to DIY the solution with Shelly relays and openhab but realised it may make it harder to sell or pass on if necessary... I contacted a company about a KNX and control 4 solution but the cost was eye watering and there were ongoing maintenance fees....

All those standards (and Loxone Tree) run fine over CAT6 so you'll be fine if you put that in to each switch. I used CAT6A purely for larger cores meaning lower voltage drop on 24V power delivery (and also it's a bit more robust for the contractors pulling it through) but I'm sure that was overkill. I was originally going to do T&E to each switch point too, but in the end dropped it as I was going all in with home automation. If anyone wanted to convert to dumb lighting in