Customers usually ask for a number of cameras. The question that actually decides whether a system is useful is how many days of footage you need to keep, because that sets the hard drive. A four-camera system keeping thirty days is a different build to eight cameras keeping seven. We now ask about retention first.
If you have a cat or a dog that moves around while you are out, standard PIR sensors will trigger. Pet-tolerant units ignore movement below a certain height, which cuts the false alarms that make people stop setting the system at all. For most homes with animals it is the difference between an alarm that gets used and one that gets ignored.
If you are mid-renovation, the right time for first fix is before plasterboard goes up. We can run cable for alarms, cameras and door entry while the walls are open, then come back to commission once decoration is finished. It is cheaper than chasing afterwards and it keeps the finished job tidy.