I used this method on my treehouse and it will depend on the type of treehouse you have whether it will suit your windows.
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Most often it is used as a child s hideout and it s just the thought of having somewhere locked that the adults cannot get to that is most appealing.
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It involves separating the main room from the window using a strong door or cover.
See more ideas about trap door tree house tree house kids.
If you have a separate main door you can lock the window cover with a simple peg or lock because it can only be locked from the inside.