22/4 - I’ve found it useful at time to have spare wire pairs at sensor locations. Also be sure to get pure copper, my 12yo copper coated aluminum wire is corroding where its used near aluminum window frames. ( bad monoprice batch years ago? )
Specify exactly where you want the sensors to be; remember doors are framed w.pretty solid headers etc. in some cases I use Micron Ion plunge sensors and a wireless setup on our ElkM1

2 Cats so you don’t have to deploy a switch. AC power near cats so you can deploy a switch.

Cat up high where you might want your security cameras. cost no object? overlap field of views. use Axis products. run extra Cat for POE IR floods.

Cat to crawlspaces for sensors.

Review your planned security systems keypad needs. may be Cat cable with a serial protocal, so more Cat5

Lots of power in your head end. ventilation in your head end. I have an exterior exhaust fan on a shelly for this.

my wife requested cams in the home. they are in the Kitchen, the attached garage, and in the lower hall pointed at the back patio door.

she checks them from the car via the VPN if the house looks odd when she gets home.

we both travel alot.

these are all Axis cameras, running to a dedicated machine in the mechanical room. we’re running a dedicated Untangle firewall to deter intrusions on the network.