Accessible bathrooms
Emergency pull cords and call systems in bathrooms
The short answer
A call cord only helps if it can be reached from the floor. Position and cord length are the whole point of the fitting.
What makes it usable
Point 1
The cord should reach close to floor level, since it is most needed after a fall.
Point 2
Installation is electrical work and should be certified alongside the rest of the bathroom electrics.
Your questions answered
Where does the alarm sound?
It depends on the system, some are local sounders, others link to a monitored service.
Can it be added to an existing bathroom?
Yes, though surface cabling may be needed if walls are already finished.
Other guides you may want
Working out what is realistic in your space?
Room dimensions, the position of the window and where the waste leaves the building decide most of it. Send those and we can be specific.