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Guests room has 2 doors:

  • One that opens inside the house, to let those already in the house move to guests room.
  • One that opens to the outside of the house, to let those outside to get in.

The inside door will have a lock only on the inside. The guests side will have no key hole, since it is never locked/unlocked from there. The guests also never need to know if the door is locked, so no need for red/green indicators either.

Question: what are the options for such oneside-locked doors?

I thought of cutting a cylinder/barrel in half to eliminate the key hole on the guests side. But not sure how it works.

I also thought of using door latches, but these have no locks/keys, which might be useful to limit kids going to guests' room without parents' approval (key).

I also thought of digital locks, but they cost a lot in every aspect: initial and maintenance costs are too high, and replacement parts are too hard to find for the same lock, as they evolve a lot over time, which may require cutting doors again and again to adapt to size variations.

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    Have you looked at an ordinary "privacy door knob?" This is a door knob that lock from the inside, without a key.
    – Wayne Conrad
    Nov 25, 2021 at 9:41
  • And typically also unlock from the outside with a screwdriver - they provide privacy, not security. this is the sort of lockset typically used on home bathrooms.
    – Jasen
    Nov 25, 2021 at 10:08
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    What about a lever Mortice lock without a keyhole drilled on the guests side? The key can be removed to prevent locking if needs be too... EDIT: like this
    – Rich
    Nov 25, 2021 at 10:52
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    What is the context, are you renting the room out on AirBnB or is this for known guests? I think most AirBnB guests would try all the doors in a room they were staying so I'm not sure it matters if they see a lock on the door, they know it will be locked. I would use a simple one sided cylinder deadbolt. Or for a cheap and simple solution a slide latch
    – DWGKNZ
    Nov 25, 2021 at 12:53

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Which side of the pond are you? If in Europe, I would use the so-called "half-cylinder" for the door lock: Half-cylinder door lock

and just put some filler plates on the guest room side to cover the holes in the door.

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