The list from the link, in case anyone's having trouble with it

1) Leaving your spare key in a obvious place
2) Your letterbox overflowing - shows you are away from home
3) Posting holiday photos on social media
4) Patio doors are a weak spot on the house
5) Leaving the window open
6) Leaving keys beside a door or window - easy for theifs to grab
7) Leaving the radio on all the time
8) Leaving expensive/valuable items near a window
9) Leaving the light on all day and all night
10) Your lawn being overgrown
11) The glass in your front door is a weak point
12) Having a air conditioning unit by a window
13) Orbituary in the paper shows a theif which house is likely to be empty
14) Leaving a ladder where a theif could easily get it, will encourage them to use it to get into a upstairs window
15) Running a business from home cause the theifs will think money and stuff worth stealing are kept on the premises
16) Pet doors for your dog to come in and out - big enough for a theif to fit through
17) Not locking your front door every time you are not at home
18) If snow is on the ground, lack of footmarks going to and from the door
19) Garden furniture can be used to help them get into your house
20) Flowers dying off in pots outside
21) Not having any fences up
22) Curtains being closed for a long time
23) Leaving the garage controls in the car
24) Not locking the garage door
25) Leaving empty boxes outside, particularly boxes that electrical goods came in
26) Overgrown bushes can be a hiding place for theifs
27) Letting strangers in without checking they are who they claim to be
28) Lack of neighbours