@black-cat said in 3-way smart switches in separate buildings.:
Best advice I can give you is to buy one and play with it.....
Good advice here.
But, in short, they all have WiFi capability, you can program them through a web browser (or their app) and a physical switch (or any number of them) can be virtually connected to a number of remotes. N-way switching (ie. multiple switches for the same lights) can be easily arranged. You don’t need any sort of central controller. They also have built-in timers with programmable schedules… Awesome!