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We're in our caravan on holiday at the moment with a 3 year old and worried she may go out for a wander early morning's as she can easily open the van door. Looking into it on Google suggests that maybe that some sort of an alarm is best. We don't want a proper internal lock for safety reasons obviously. How as anyone else delt with it.
iPad and a bucket of haribo keeps em in one place. Or tell her about all the wolves out there.
A bolt high up on the door.
Car battery and a couple of wires to the handle
A bolt high up on the door
Good idea, however....
Parents did this on our kitchen door when I was a toddler as I kept raiding it in the night for food. Then I learnt how to climb up to it lol! Then they took the little bit you use to pull the bolt out. My nana was staying with us one time.and it stumped my nana as to how to get in, it's ok nana I said apparently, they hide the bit for the bolt over there lol!
Didn't grow up to be a burglar, but i still need a lock on the kitchen door to keep me from clearing it out lol!
Stairgate
Aged 3?
Honestly, I'd just lock the door. I'm not sure what "obvious safety reasons" you're concerned about.
How about a baby gate? You can get ones that are like roller blinds, we have a couple which have thus far proven impervious to 3-year old fingers.
https://www.amazon.co.uk/Retractable-Baby-Gate-Upgraded-Operation/dp/B09BJWMHRG
Security chain
Cupboard door/drawer hook lock
Window restrictor (but fitted to the door)
My son, in a split second, dragged a chair to the door, reached up, opened the door and legged it, on holiday, whilst we were in Spain. Fortunately he'd gone to the 'ride on' car round the corner from our room !
How about alarming the door?
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Zip ties and ductape
Lock the door.
If the very worst came along, say a fire. You can easily kick a caravan door open.
Zip ties and ductape
Yep, don't let them get out of bed!
Zip ties and ductape
At home.
Then you can holiday in peace knowing they are safe at home in bed.
Ductape. You only need to do it once

A bolt high up on the door.
Great but make sure there are no tricycles around for her to stand on to reach - still got the scars from that childhood incident.
Velcro sheets.
Velcro... Lots of velcro.. Then you can just stick them on a wall.

The ductape is looking as the best option.?
Even though the door is locked, it is easily unlocked by just pulling down on the handle.
Then I learnt how to climb up to it lol!
I remember walking in to our kitchen and finding my two, youngest (3ish) on the eldest's (5-6ish) shoulders, looking in the top cupboard for easter eggs. Didn't know whether to tell 'em off or just applaud
Barbwire and a claymore. Same universal answer as Hannahs shed thread!
Tie a string from the door to something that'll make a big noise when it falls when the string is pulled by the outward opening door.
You could even put it outside and trap it in the door, if you have something like a saucepan which will make a good clatter when it hits the step. Don't do this on the inside as it'll hit the person opening the door on the head.
Or tie it to your wrist.
You can easily kick a caravan door open.
Yeah, a caravan is little more than aluminium coated cardboard.
I’m sure Warner Bros cartoons will have lots of fun boobytrap ideas!
At 3 I would be telling them to stay in bed or one of you gets up with them
As above why not just lock the door ?
FinkyDunc has it.
At 3, you wake up with them and just lock the door.
The velcro wall option is a winner,wish I had thought of that years ago 😉
Bury the caravan.
If thats a little extreme, simply roll the caravan onto the door side.
Again if thats a "bit much", lock them outside then they cannot escape from he caravan.
Honestly you just need to reframe your question sometimes...
One of these up high?
Ductape. You only need to do it once
Thats parcel tape 😉
Ask Josef Fritzl.
Surprised that nobody has suggested the obvious: don't use a caravan.
Tell them about the baby eating zombies living under the caravan.
Put a sign up.
OP - what solution are you going with?
Leave child at home, with the gramps for example. They can do it in your house thus saving the pensioners living expenses.
That way it's a double holiday.
Lead? As in a bit of rope.
Anticipate it and when the crime is committed tan their backside.
Lead? As in a bit of rope
To be fair lead, lump of, would be pretty effective at slowing them down.