Please, be humble and consider the possibility that you-yes you-might be committing numerous home security mistakes-that could really cost you if you don't correct them.
House Alarm Turned Off
Some people only activate it when they are not home and others only activate it when they are sleeping. The alarm should be on at all times. Simply deactivate it when you go outside, but once back inside, switch it back on. Don't think for a second that evidence of you being inside the house will deter a crazed intruder.
Not Locking Doors
Doors should be locked at all times, even if you keep going outside. Now I understand that maybe it wouldn't be practical to lock the front door if you're going in and out every two minutes to work on your front porch. But I think you know what I mean. Keep the doggone doors locked whenever you go out and while you're inside the house.
Not Locking Windows
Many windows are easier to get through than the front door, and they're also often hidden by shrubs. Burglars love windows. Never go to sleep with an open window that can be accessed from outside. Lock all windows whenever you go out. It's okay to have a window open for a fresh breeze while you're home, but don't go overboard with "getting some air."
Being a tightwad when it comes to investing in locks/security doesn't pay off. When it comes to locks, you get what you pay for.
Use a keyless lock or give your house keys to a trusted adult; never "hide" them outside.
When finished with a ladder, put it back inside--immediately.
Can outsiders see your valuables through your windows? If so, it's time to do some rearranging.
Keep the house well-lit when you're gone, and when home, make sure there's plenty of illumination.
"Are they on vacation?"
Your house shouldn't trigger this question. Don't let mail, newspapers and other deliveries accumulate. Don't let your lawn and shrubs get overgrown. Speaking of vacations, never post on social media about your vacation until you've returned!
This is bad. Keep it locked at all times.