Wireless devices have made smart homes easier, but the best systems still depend on wire: power in the right boxes and data cable to the right spots. With walls open, that wire is inexpensive. After drywall, the same work costs several times as much.
Neutral wires at every switch
Most smart switches and dimmers need a neutral. New work includes one by default, but confirm it for every box, including three-way locations. In an older home, a remodel is the chance to add them. See smart home wiring.
Deeper boxes
Smart devices are bulkier than standard switches. Deep boxes make installation easier and connections more reliable.
Network cable beats Wi-Fi
Run Ethernet to televisions, desks and, most important, ceiling locations for wireless access points. One or two well-placed, wired access points outperform a chain of mesh units.
Cameras and doorbells
Cable to eaves and entry points for cameras, and a properly rated transformer for the video doorbell. See doorbell wiring.
Shades, speakers and sensors
Motorized shades need power or low-voltage cable at the window head. In-ceiling speakers need speaker wire to a central point. Neither is practical to add after paint.
Lighting zones
Plan lighting in zones and decide which get dimmers, which get occupancy sensors and which join scenes. See lighting installation and outdoor lighting for layout ideas.
Energy and EV readiness
Leave panel space and conduit for an EV charger, and consider circuit-level energy monitoring or a smart panel if solar and batteries are in your plans.
A central spot for equipment
Give the router, switch and hubs a ventilated cabinet or closet with a dedicated outlet. A remodel is the easiest time to create one.