I have two separate locks on my door. The upper one is Zoo MK5 cylinder lock (knob inside, keyhole outside); lower one is a split spindle latch (lever handle inside, keyhole outside).
To open the door from the outside, I need to unlock the upper lock and then use my key for the lower lock to turn the latch.
I’d like to add a smart lock. What’s the best way to make this door smart? Is it to (1) make the lower lock a proper lock + latch and ignore the upper lock or (2) make the lower lock a latch that can be opened with a lever handle from both sides without a key? Which is less likely to affect the fire resistance of the door or hinder escape in case of emergency (because this is a leasehold property)?
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