We live in a house with an a joining garage. There is no internal doors, to access the garage you must go out the back door, through the garden into the garage.
My children are 3 and 6. My dh loves to Potter in his garage and often does so of an evening.
I'm going out tonight so I've had to fetch him in to be responsible for the children. My 6 year old has asked him not to return to the garage after they have gone to bed and he feels this is very unreasonable.
He thinks she should be quite happy in the knowledge he is just next door.
I quite agree with my 6 year old, if he's the only adult he should be close enough to hear them.