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Make sure you have a conduit going from the entry point to your main IT closet, and from there to the attic and the crawl/basement, and a centrally located closet on each level.

Conduit to every room if desired, and honestly, I would pull fiber if I did it again.

KNX wiring

Run Ethernet to your doorbell

Not necessarily related to home automation but outlets behind every toilet if you ever plan on installing bidets

I’m about to start building and I listed out all 128 runs of cable – highlights:

• I’m not doing speaker runs. Maybe I’ll regret this, but voice assistants and whole-home audio just isn’t my family’s jam.
• Every place I put an outlet, pull two runs
• Just about every wall has a jack, minimum two per room
• Dual runs for security cameras to at least all four corners of the house; I also have several interior cameras as well
• Smurf tube
• Sensors for windows & doors, even interior doors
• Runs for access points
• Runs for hardwired sensors
• Runs to utilities (water shut off, power monitoring, water heater, even behind the washing machine)
• Runs for water leak detection
• A lot of the locations I’m pull cat to are NOT for ethernet, not at the outset anyway. My philosophy is that maybe someday down the line there would be some novel reason to have an ESP32 at the end of the run for a door sensor – until that time, though, wire is wire and I can just use the ethernet cord for a dumb reed switch loop, no big deal.

And here it is in a visual drops location format

Run conduit. That way it standards change you can run new cabling through it with minimal effort. That’s the most valuable thing you can do.

Cat6 to every room, network closet on each floor, well planned wi-fi APs and the rack in the basement. Beyond that…low voltage (12 to 24) to each window and door, maybe even an extension of the Cat6 to keep things unified, POE has come a long way. Ultimately my goal is to hard-wire as much as possible to reduce the wireless load. Security cameras are all hardwired POE types etc.

Prepare for electric car changing station and heat pumps.

I would run Cat6A not cat 5E. At least 5 runs to each room. I would run the largest reasonable gauge cable and have each rooms receiver in a closet along with the networking gear. I’d future proof running 2 fiber runs to each room.

Don’t skimp on ethernet. Even if not needed for data transmission, it can also be used to power low voltage devices via POE. (Example, wall mounted LCD panels for smart house).

Why CAT5e? Go CAT6. You don’t need CAT6 now, but you may in the future. The cost difference is not that bad.

You also may want outlets on the eaves of the roof for Christmas lights.

While you’ll have speaker wire, might as well run wire for an Dobly Atmos setup. You might now use it, but you may in the future. Make sure to run good quality and proper gauge wire a well. Might as well run the wire for a dual subwoofer setup. Again, you’ll probably won’t use it, but maybe in the future.

Make sure to have an outlet where the CAT5 panel runs into a well. I had to hire an electrician to install one. That said, my house did not come with a panel and did all the work afterwards.

I’d go nuts with conduit.

Power delivery USB C that supports 100w minimum to every room. PoE cable to every room. Switches with energy monitoring.