Building cheaply and dear security.
With us, there were lockable window handles from the BU included for free.
In addition, 2-3 timer switches that suggest during the day that someone is still in the house, a huge water bowl with a bone pattern stands at the front door, at the "most dangerous" window (side terrace door under the carport/utility room) there is a 25-kilo bag of dog food, of course with a giant dog pictured. Overall, this scares off 80% of potential intruders.
In summer, I allow myself to draw a burglar’s symbol with chalk on the pavement.
-> cheapest security package [emoji2]