When you are building a home, you are not building it for the next two years, you are building it for the next 20 to 25 years. You need to think about the avail

When you are building a home, you are not building it for the next two years, you are building it for the next 20 to 25 years. You need to think about the availability of your "SmartHome" appliance/system in 20 years. This is why you should use a standard based system at the hardware level which can have a gateway (with an open source option and open protocols) to a kind of "interaction system" (voice, tablet, whatever). The interaction system can change faster (for 10 years we did not had tablets) but you can still address the hardware built in the house. After hours of research, the only option at the moment is KNX with 100's of suppliers of hardware and many "interaction systems" both pure hardware (switch) and software. Software is both open and closed source. From the security point of view, you can have the complete home automation system disconnected from the internet/local network and have it to work only with hardwired panels/switches. [0]: https://knx.org/ https://knx.org/